High temperature hot melt adhesive on the choice of the national advantages of hot melt adhesive

What is EVA hot melt EVA hot melt adhesive is a solvent-free water to 100% without the solid meltable polymer; which is solid at ordinary temperature, it is heated to a certain temperature into the melt to flow, and there is a certain viscous liquid. EVA hot melt adhesive melted and light brown or white. EVA hot melt adhesive from the basic resin, thickener, viscosity modifiers and antioxidants and other ingredients. The basic resin base resin hot melt adhesive is made of ethylene and vinyl acetate copolymer at high temperature and pressure, namely EVA resin. This resin is the main component of the production of hot melt adhesive, the proportion of base resin, quality determines the basic performance hot melt adhesive, (such as adhesive bonding capacity, the melting temperature and bonding strength) usually selected VA content of 18-33, Melt index (MI) 6-800, VA content is low, the higher the degree of crystallinity increased hardness, large VA content under the same circumstances, the crystallinity of the low elasticity increases, EVA melt index is also important in the selection, the smaller the melting means illiquid strength high melting temperature of the adherend wetting and penetration is poor. Instead melting means too much of its low melting temperature glue, good liquidity, but the bonding strength. It aids choices. You should choose ethylene and vinyl acetate proportioned. Thickener thickener is one of the main aid EVA hot melt adhesive. At a temperature adhesion has, when the temperature drops, the sheets would be difficult if only the base resin melt * with wetting and penetration, loss of bonding capacity, can not achieve the bonding effect; tackifier can be added improve liquidity and colloid adherend wetting, improved bonding properties, to achieve the desired bond strength. Usually tackifier rosin, modified rosin (138 or 145), C5 petroleum resin, C9 petroleum resin, terpene resin and the like. One of the main aid viscosity modifiers are also hot melt viscosity modifier. Its role is to increase the mobility of colloids, adjust the solidification rate, in order to achieve the purpose of rapid firmly bonded, or hot melt adhesive viscosity is too large or illiquid, difficult to penetrate into the signatures go, you can not its bond firm. Join the softening point low viscosity modifiers, can penetrate reached good adhesion, sticking too firmly purposes. Usually selected paraffin wax, microcrystalline wax. Synthetic waxes (PE or PP), Buddha-Tropsch wax and the like. Adding the right amount of antioxidants is to prevent premature aging antioxidants EVA hot melt adhesive. Because the melting temperature of the colloid at high oxidative decomposition will, antioxidants may be added to ensure that under high temperature conditions, the bonding property does not change. In addition to these several raw materials can also be coupled with something for cold temperatures or cold agent suitable for tropical temperatures thermal agent according to the temperature difference, the region. [2] Select one, plastic color requirements should a difference. Then things themselves if they are no special requirements for color, we recommend the use of yellow hot-melt adhesives, in general, better than hot melt adhesive yellow white sticky. Two, to be followed by surface treatment. Hot melt adhesive surface treatment is then no other adhesive material so strict, but was followed by the surface of dust, oil should also make the appropriate treatment, in order to make better play the adhesion of hot melt adhesive. Third, the operating time. Work fast is a major feature of hot melt adhesive. Hot melt adhesive working time is generally about 15 seconds, with the modern means of production - widely used line of hot melt adhesive to the job requirements of increasingly short time, such as bookbinding and speaker manufacturing of hot melt adhesive working time required to achieve approximately 5 seconds. Fourth, anti-temperature. Hot melt adhesive temperature sensitive. The temperature reaches a certain level, hot melt adhesive begins to soften, below a certain temperature, the hot melt adhesive becomes brittle, so I chose hot melt adhesive must be fully taken into account the environment in which the temperature changes in the product. Five tack. Hot Melt viscosity and tack points early post-sticky. Only early and late sticky viscous consistency, and to be followed in order to make hot melt adhesive material holding steady. Hot-melt adhesives in the production process, it should ensure that it has antioxidant, anti-halogen, acid alkali and plasticized. Litters different materials, hot melt adhesive and then played different, therefore, should choose a different hot-melt adhesives based on different materials. [3] Hot Melt index with hot shoe: mainly used for the production of a melt viscosity such as shape, shoes, caps: 8000CPs / 180 ℃ softening point: 95 ℃ not more than plus or minus 5 ℃ Gardner color: 0 ± First 0.2 Viscosity:> 20 # brass balls peel strength:> 4.8N / in2 melting temperature: 160-180 ° Electronics melt viscosity of hot melt adhesive: 8000CPs / 180 ℃ softening point: 85 ℃ not more than plus or minus 5 ℃ Gardner Color: 0 ± 0.2 tack:> 20 # brass balls peel strength:> 4.3N / in2 melting temperature: 160-180 ° optimum: white transparent pressure-sensitive adhesive coated composite melt viscosity: 7500CPs / 180 ℃