Anhui 8-120 mesh on the fine white calcium carbonate heavy calcium

The surface treatment of calcium carbonate called upon activation of calcium carbonate. Calcium carbonate powder materials and other powder materials, like, in order to improve the affinity matrix plastic interface, its activation treatment is often necessary, but also for enterprises calcium carbonate, calcium carbonate is the production of deep-processing products One important measure that can increase the added value to gain better value for money. However, the following points should attract attention: First, not all plastics processing companies are required to calcium carbonate, the company offers after-modified calcium carbonate products, often those who produce large quantities of product, and the formulation and processing technology are very stable plastic processing enterprises only require activated calcium carbonate products, such as PVC profile production enterprises; and more plastics processing companies prefer to conduct its own surface, handling equipment and handling agents they use are often more its own characteristics. There are also some products in the production of calcium carbonate does not require prior surface treatment, such as PVC artificial leather. Secondly, we are talking about activation means calcium carbonate particles into the surface of a hydrophilic lipophilic, this goal can be covered by physical or chemical reactions to achieve, it can also be more complex physical, chemical and mechanical processes to achieve. Principle and this activation process is not the same in the production process of light calcium carbide into the agglomeration treatment performed, the processing agent used is not equivalent to what we call the surface activating additives. Further, as the powder application technology progresses, more and more people realize that the interface powder materials and polymer matrix material is related to the material properties of the big issues, much to do, it can be said Filled in the development of technology, the interface morphology of powder particles and between the plastic substrate is a major breakthrough in the strategic, we must not put the surface treatment of calcium carbonate as a very simple and very easy thing to look at. 3 calcium carbonate used in several typical plastic products and the specific requirements of polypropylene bags (cloth) with a flat yarn, PP woven polypropylene strapping (cloth) with a flat yarn, polypropylene packing tape are all one-way pull extension products, namely polypropylene plastic molecules to be oriented in the stretching process, the stretching direction of its strength has been significantly improved, much higher than the actual requirements for the use of an inexpensive filler foundation. PP woven bags (cloth) with the provisions of the national standard flat wire tensile load ≥0.32N / tex, pure polypropylene flat yarn tensile load up to 0.5N / tex or more, when the amount of calcium carbonate reach 20phr, Biansi tensile load can still reach the national standard. Polypropylene strapping include machine and hand bag with tape, you can add a larger amount of calcium carbonate, but because of the machine requires a certain rigidity belt package, packaged with calcium added too much can make soften the impact on the use of packer. Used in flat yarn and 400 are packaged with the purpose of heavy calcium carbonate, because of low cost, processing flow, and can meet the requirements, it has not changed over the years. To make GCC dispersed in plastics, are first processed into filler TSP. In recent years, filled masterbatch production technology has changed greatly, the carrier resin component is less and less, GCC as high as 85%, processing machinery and equipment are mostly the same rotating twin screw extruder, different grades of product prices There are very different, to meet the different needs of users. 3.2 Polyethylene film Polyethylene film made shopping bags, vests bags have been around all corners of social life, but also to one of the "white pollution" is most concerned about the community, the city more and more disabled advocates, advocates charged with to curb the use of public opinion called louder, advocate the use of degradable plastics to conquer the world of radical white pollution after another, some even to the ground in an attempt to deter consumers toxic plastic bags away. Unfortunately, plastic bags still go its own way, did not reduce the white pollution. Calm down and think, the truth is that today we can not do without plastic bags, raging face in 2003, "SARS", the medical staff protection, medical waste shipment which left it with a plastic film it? Cut blocking as grooming, with better cost performance materials, technologies and methods more in line with the characteristics of the times, to really protect the environment aspiration to be realized step by step. Modified polyethylene film inorganic powder is still not assume completely eliminate the "white pollution" sacred mission, but the material for the manufacture of difficult recovery or no recycling value of the plastic packaging, will greatly reduce the environmental The pressure and adverse effects. Inorganic powder material is filled polyethylene film (bags) functionality and environmental unity, combined with low prices will undoubtedly be the most at this stage to promote the value and application prospect of environmentally friendly materials. Join 1250 GCC in polyethylene plastic, when the amount of 30%, the mechanical properties of the blown film can still meet the subject requirements, see Table 7. 3.3 polyvinyl chloride (PVC) profiles polyvinylchloride (PVC) profile production technology since the eighties of last century into our country experienced a tortuous development process, today PVC profiles and doors and windows are widely recognized by society, not only a significant increase in production capacity, and is used widely. According to statistics, PVC profiles for doors and windows of the annual output has more than one million tons (2002 actual sales amounted to 1.2 million tons), according to calculate the amount of light calcium 80%, the annual demand of 100,000 tons of calcium light above . Table 8 lists some production of PVC profiles used in the formulation of calcium carbonate situation. Mechanical properties of tensile strength mechanical properties of PE film and HDPE6098 HDPE7000F Table 7 as the base material filling GCC PE film (MPa) Elongation at break (%) dart impact strength (120g, no damage frequency) right angle tear strength (N / mm) Aspect Aspect Aspect HDPE7000F 54.3 56.6 435 440 10 145.7 203.4 HDPE7000F + C masterbatch 35.9 31.5 390 425 9 111.7 144.0 HDPE6098 53.9 50.7 380 520 7 141.4 216.6 HDPE6098 + B masterbatch 29.5 95.9 149.9 29.3 4,204,756 containing heavy Calcium 30% of Japan's sample 21.1 31.9 47,037,010 156.9 101.3 GB GB12025-89 Note: PE film filling weight percentage of TSP 1250 Head 30 ± 0.5%. Table 8 PVC profile production companies and circumstances of the formulation using calcium carbonate, the company the amount of calcium carbonate formulation (phr) Germany Hostalit Company (light calcium) 2.0 to 4.0 5.0 Germany Han Kel company (lead salt stabilizer), 4.0 (Ba / Ca stable) German company BAE ROPAN 6.0 Atochem (0.8μm) 5.0 4.0 10.0 Domestic enterprises should be noted that from the initial introduction of the technology, PVC profiles formulations have light calcium, and is surface-treated active calcium. Profile production companies in Europe and did not light calcium as mere filler to reduce costs, but in order to further improve the impact toughness of the material, they added light amount of calcium is limited and is surface treated. Because we buy technologies are specified using light calcium, followed today all profile production enterprises are using treated light of calcium, and combined with China's national conditions, the amount of light of calcium is increased to 8 ~ 10phr. For many companies issue raised can clearly answer: ① PVC window profiles with the possibility in light calcium GCC instead of small, because at lower than add, not only can not use TSP significantly lower raw material profiles cost, and may be due to reduce the length of the bar is made of material per unit weight affect the overall efficiency. ② replaced with GCC light calcium, at least GCC fineness of 800 mesh or more, and even the purpose of the TSP 1250, only this time the performance of the filler material may be compared with the intended use of light calcium, while relatively small in terms of price and TSP Compared to ordinary light calcium does not take advantage. ③ profile production is usually in large quantities, and requires several dozen or even cross-sectional shape of the profile in a different production line, and then carry out the cut pieces separately assembled. Requiring production line assembling the different cross-sectional shapes of color profile exactly, and only use light calcium composition is very stable in order to do this, light calcium manufacturers easily do this, GCC producers to ensure this is more difficult, because TSP component depends entirely on the ground before the ore. In order to reduce the production cost profile, increasing the amount of light calcium is the preferred measure. Increased use of the blind will lead to performance degradation profiles, so the key is to profile the performance of the competition to reach the national standard GB / T 8814-98 "the doors and windows of unplasticized polyvinyl chloride (PVC-U) profiles" and GB 11793.2-89 " Under the premise of the mechanical properties of PVC plastic windows, weathering test conditions "specified to maximize the amount of light calcium. Concord compound Nanjing Chemical Co., Ltd. will have a special structure and function, hyperdispersant high quality lubricant (inside and outside) complex with the introduction XH-CR and XH-CA series modifier in PVC profiles, pipes application processing performance, can improve the system, the apparent product, but can also increase the amount of filler right amount, its main performance is not affected. Table 9 shows the use of a plant profiles and profile products XH-CR11 performance test results after the XH-CA01. The dosage formulation PCC 25phr. Table 960 doors, 60 outside the open fan Profile Performance Project 1st on 2 GB 8814-98 MPa tensile strength requirement after 38.9 42.35 ≥37 heated state Pass Pass no bubbles, after cracks, pitting dimensional change upon heating% 1.9 1.7 - - weld strength N 5120 5670 ≥3000 low temperature falling weight impact (broken number) 0 0 ≤1 Elongation at break% Note: No. 1 and No. 2 are using XH-CR11 and XH-CA01 two modifier two formula system, except that the 1st system uses ACR401 2 copies. 3.4 polyvinyl chloride (PVC) pipe PVC pipe many varieties, such as construction, drainage, cold-formed threading tube, bellows, chemical pipe, communication with the sheath tube, shaped the water pipe. Calcium carbonate is used as a filler are common, and some companies use a lot without taking into account the relevant national standards, but if the production line with national standards of the pipe, the amount of calcium carbonate to restricted. Table 10 lists some calcium carbonate is used in the case of pipe. Table 10. Several PVC pipe used in the case of calcium carbonate CaCO3 type of pipe production equipment case (phr) construction of water supply single-screw extruder 2 building drains single screw extruder 6-8 cold-formed single-screw threading tube Chemical extruder 10 to 15 by a tube twin-screw extruder a large-diameter pipe 10 twin-screw extruder wall corrugated pipe twin-screw extruder 4 PVC pipe due to the type of large output, despite the use of calcium carbonate proportionally say much, but the total amount of PVC pipe, the amount is still large, it is China's important calcium carbonate plastic varieties. In view of the pre-plasticized PVC resin in a high speed mixer to be used, and calcium carbonate powder may be stabilizers, lubricants, additives, modifiers and the like were added together, so that the use of calcium carbonate surface-treated substantially all light carbonate calcium, individual manufacturers have to use heavy calcium carbonate, the fineness of 800 mesh more so, it's best to advance through stearic acid or coupling agent. 3.5 Communication cable threading pipe casing is currently very popular a few stick together modular casing, commonly known as "Plum." Plum with HDPE as raw material, because there is no such pipe national standards or industry standards, can be accepted as long as the user, in order to reduce the cost of the extensive use of TSP, some with a capacity of more than 50%. In order to make the powder and granular triple superphosphate mixed HDPE, it needs to be made of heavy calcium powder filler, and mixed with HDPE pellets even after extrusion. GCC used for the purpose of the product to 400. GCC advance to a surface treatment process for Plum and performance is good. 3.6 leather and other polyvinyl chloride (PVC) soft products added dioctylphthalate (DOP), dibutyl (DBP) plasticizer such as polyvinyl chloride (PVC) products have a certain softness, called soft products, such as leather, vinyl flooring, wallpaper, cable sheathing materials, films and the like. PVC products commonly used to carbonate soft filler, not only cheap, good hue, and the product surface appearance is better. Table 11 and Table 12 lists some cases of soft PVC products use calcium carbonate. Table 11 Some products use PVC soft PVC soft products calcium carbonate cases the amount of calcium carbonate species (phr) calendering wallpaper (not foam PVC film) 50 calender wallpaper (foaming) 50 flooring leather grassroots 80-120 calendering chemical pressure GCC flower floor leather foaming layer 40 to improve the liquidity of coal mine ventilation duct 10 to 20 knife coating leather wallpaper (foaming / high foam) 20/25 GCC improve liquidity high foam wallpaper rotary coating method (bottom / surface layer) 20/20 coating method chemical embossed leather floor (ground layer / foam layer / back coat) 100/25/50 calendering PVC floorboards TSP 150-300 double-coated tarpaulin leather 20 Sealants 50 to 70 cable sheath materials 10 Table 12 various PVC artificial leather leather light amount of calcium species common law direct Scraping Scraping indirect method ordinary leather leather calendering ordinary leather foam leather Direct Indirect method Scraping Scraping method calendering foam foam leather leather shoes, leather light calcium dosage / phr bottom surface 201 510 30 - 20 10 - 252 010 20 underlying the surface layer 5 in Table 11 are light does not indicate calcium. As can be seen in soft PVC products are used in most light calcium, only the requirements of the material flow and good occasions TSP. In fact, this primary is to historical reasons, light calcium first entered these product areas, due to the light calcium GCC oil absorption is 3 to 4 times, so instead of using the smaller GCC light calcium for improving the use of plasticizers The effect is beneficial, but the resulting product for the same area of ??material differences, many manufacturing companies are still reluctant to use GCC instead of light calcium. Surface treatment of light calcium may reduce its oil absorption, while the dispersion properties of light and particles of calcium throughout the material is good. The production of PVC soft products, in many cases the first burnt PVC resin additives together with the necessary PVC burnt, it can be seen from Table 13, the use of light calcium is much greater than the viscosity of PVC burnt use TSP PVC burnt, and TSP The thicker, the smaller the viscosity of PVC burnt, that liquidity is better, the better the coating operation. Table 13 different viscosity burnt PVC made of calcium carbonate / Pa · S, 15 ℃ added amount / phr light calcium burnt 300 mesh 200 mesh GCC GCC burnt burnt 0 0.50 0.50 0.5 10 0.85 0.62 0.61 30 1.13 0.68 50 4.10 0.66 80 0.90 0.80 1.20 1.00 NOTE: PVC is burnt Formulation PVC 100, 70 plasticizers, diluents 30, the other seven. Use of calcium carbonate in the cable, wire sheathing is also very common, and GCC light calcium can be used, the use of light calcium wire, cable look more bright, when using TSP, low torque extrusion equipment, display Processing flow of materials is good. 3.7 polyolefin injection products many companies want to reduce the cost of raw materials of plastic products by adding cheap fillers, this is a completely normal way of thinking, but in some plastic products is not the case, especially in a large injection pressure molding injection molded article , due to a significant increase in the density of the filler material, it is possible to bring cheap filler effect was offset by a reduced number of individual products, the economic losses, the overall economic effect is not ideal. Have already been described namely calcium carbonate when used properly, it can be used as an impact modifier for plastics, but still can not avoid the negative effects of increased density. In today's no shortage of synthetic resin, injection molding products to promote the use of non-ore materials include calcium carbonate, including, it must overcome a substantial increase in the density of the storm. Front table with calcium carbonate as the main filler material non-mineral powder and polypropylene composites listed 4 demonstrate this possibility, scientists hope to have more to make a breakthrough at this point. 4 calcium / rigid PVC (PVC-U) composite pile technology has made a major breakthrough in the recent use of a specially treated calcium carbonate to obtain a breakthrough in rigid PVC profiles, pipes and other products, First, the addition of 10 to 30 parts in the original formulation of this special treatment by light calcium, without increasing the density of the composite material, and second, the tensile strength, flexural strength (rigidity) and impact strength (toughness) does not drop, even increase. The result broke the previous all technical barriers filled plastics, filled with modified plastics rewriting of history, theory and application of polymer modification technology to take off the milestone of epoch-making significance of innovation. The general manager was invented by Dr. Zhong Mengguang Haizhe China Chemical Materials Co., Ltd. and put into practice the scientific and technological achievements have begun to industrialization, thousands of tons to be specially treated calcium carbonate is into a family of plastic profiles, pipes Shops are writing a new chapter in the history Filled. The research uses a modified theory is completely different with the traditional way of thinking, through the establishment of surface deposition chemistry, organometallic complex chemistry, surface aggregation theory and the theory of super-network topology for the new interface chemistry of the main features of the design theory, based on polymer materials short-range, long-range structure, crystalline structure and aggregation characteristics, well-designed powder material state of existence in PVC plastic substrate, but also changed this space form of powder materials PVC plastic matrix macromolecules and bound state between each other, to achieve a brilliant goal three different improvement. Three no's: no increase in density; not fall under performance; productivity is not reduced; an increase: significant increase economic efficiency. PVC macromolecules in the multiple roles of calcium carbonate powder through special treatment in cooling extrusion molding process, reasonable, new stuffing, hollowing out and implement network, so that the composite material performance with a new look in front of us. In PVC Profile, for example, the same basic formulation were added to the general activity of calcium carbonate and the special treatment of light calcium, in the amount of the mechanical properties of different types of filling materials shown in Table 1, Table 2 and Table 3 as show. Table 1 two kinds of CaCO3 at different loadings PVC profile tensile strength (MPa) filling amount (phr) 5 10 20 25 30 40 50 Common PVC profiles filled activated calcium 41.0 40.0 37.2 34.0 31.5 26.8 26.1 Light Calcium filling special treatment PVC profiles 41.5 41.3 41.2 41.3 41.2 41.0 40.9 Note: The basic formula for the profile (phr): PVC 100, TiO2 5, CPE 8; ACR-401 1.5. Table 2 two kinds of CaCO3 at different loadings PVC profile flexural modulus (MPa) filling amount (phr) 5 10 15 20 25 30 40 50 Common activated calcium filled PVC profiles 2,300,230,022,001,880 --180,016,001,600 special treatment light calcium filled PVC profiles Table 3 aspect CaCO3 at different loadings low notch impact strength of PVC profiles (double V notch) (kJ / m2) filling amount (phr) 5 10 15 20 25 30 35 40 50 Common activated calcium PVC profiles filled 30 28.5 25.5 18.0 15.0 13.0 - 12.0 10.8 special handling PVC profiles filled with light calcium 30.5 35.0 39.5 - 43.2 47.5 48.0 46.0 38.0 From Table 1, Table 2, the data in Table 3 shows that in general the higher the activation of calcium loadings When it would lead to a substantial decline in the composite material properties, and the use of the special treatment of light calcium, as calcium particles piled light structure and PVC plastic substrate molecule is a fundamental change, not only the toughness of the material (low temperature), flexural modulus amount (rigidity) have significantly increased, and this increase is maintained in the case of the tensile strength substantially constant to achieve. In addition, the company also successfully developed a special treatment Ⅱ type precipitated calcium carbonate, can further increase in current use 5phr calcium carbonate based on the use of this powder material 20 ~ 50phr, the filling material density substantially unchanged , the tensile strength, flexural modulus and low-temperature impact strength at the same time have increased, showing that this special treatment of light calcium technical advantages and superiority. Because of the mechanical properties of the three while improving prehistoric no cases, and this increase is in the density filler material to achieve without an increase, which could bring huge economic benefits for the downstream enterprises to use this new powder material while From the effective use of resources, because saving a lot of petroleum-based synthetic resin, to around the Earth around the limestone instead of valuable oil, according to the current annual output of more than two million tons of PVC profile and pipe, as this special The average amount of calcium carbonate filling process is 25 percent, it means for the country to invest billions of dollars to save a large petrochemical plant, annual savings of several hundred thousand tons of oil, its economic and social benefits are extremely attractive and encouraging for us in lift modified plastics industry over new page at the same time, it also brings hope and light for our industry to achieve deep processing of calcium carbonate and products with high added value, worth the joy Hu and celebrate! 5 Conclusion calcium carbonate used in the plastics industry has made remarkable achievements, it has become an important raw material indispensable for the plastics industry. The rapid development of China calcium carbonate industry for the plastics industry offers a choice of material conditions and exploration, the application of calcium carbonate in the plastic material achievements but also to guide the development of the calcium carbonate industry. Two industry interaction and facilitate a typical feature of the new century industry continues to develop. We hope that the calcium carbonate industry, the strength of the business not only to make calcium carbonate products, but also to the further development of calcium carbonate as the main raw material of plastics and new materials, new products, rather than simply to produce a particular product, have Let plastics industries. It should be said that many of them filling modified plastics industry experts and technical personnel, but for many plastics enterprises, many companies do not have the use of fillers and filling modification of knowledge, if we are calcium carbonate industry, business people understand their products how the product is used in plastics processing, we developed a calcium carbonate production enterprises calcium carbonate as the main raw material processing products, and for many plastics processing enterprises to establish a model, selling the output of calcium carbonate and also the application of technology, then our country calcium carbonate products will have a broader arena, the calcium carbonate industry will move toward a brighter future.