Auto parts mold release agent

PU PU release agent release agent Edit Definition English RELEASE AGENT, aka PU release agent. Polyurethane PU is an abbreviation, the Chinese called polyurethane called polyurethane. PU release agent known polyurethane release agent. 2 Use: automotive parts foam, textile, printing and dyeing, footwear, stamping and processing, and other electronic components. 3PU (polyurethane) polyurethane release agent editor stripping principle and adhesion surface of the mold is generally believed caused by two reasons. First, the surface of the mold will usually be a thin film of water or even a single molecular layer is covered, generated a strong adhesion after this layer of thin film of water with isocyanate, and secondly, by the mold surface bonding generating polar groups and polyurethane and polyurea polar groups react chemically induced. In order to make a good mold release products, the mold surface must have a dense smooth film) and raw material requirements of the film is neither a certain reaction and mold adhesion, while a certain degree of flexibility. The effective release material (typically inert substance) was uniformly sprayed through the medium (solvent) in the mold, to be the medium (solvent) volatilized after a smooth film is formed, which play a releasing effect. "Species" Polyurethane release agent is divided into two kinds of external release agents and internal mold release agents. At present, the vast majority of polyurethane products processing plants are using an external release agent. Since the 1970s, Dow-Corning Company launched the first in the post-release agents and hydroxyl been improved, a number of other companies have produced a variety of internal mold release agent. Since the release agent is foamed formulation appeared as part of a group, it will change the use of the foam formulations, and can affect the physical properties of products, so the current domestic and international polyurethane industry is still widely used outside release agent, and continue to develop new products and gradually expand the scope, but also the development of new products within the release agent. First, the external mold release agents for polyurethane molding easier to remove when the products from the mold, the mold surface coated with a layer of varnish, called external mold release agents. External mold release agents are divided into three types according to usage: durable type, that can be coated with a molding times; hydroxyl often coated type, that is coated once before each molding; multilayer composite. The more commonly used coating type often hydroxyalkyl, which can be divided into the following external release agent according to the kind of the compound species its use. 1. The silicon-based solvent-based release agent (silicone oil, silicone paint); emulsion (silicone oil); complex type (silicone ten silica); aerosol (silicone oil); dry type (bridge type silicone) . Silicone series releasing agent due to its surface tension, with heat, non-toxic, good gloss, no affinity with the resin, etc., and is widely used in plastics, rubber and other occasions. German Patent DE2919811 in Miehacl proposed a ratio generally stable silicone release agent performance can be repeated to maintain a stable number of releases and molded painted nature. It consists of polydimethylsiloxane, organosiloxane resins, alkyl titanate or a titanium chelate. Especially suitable mold release agent such PU elastomers of various parts and molded foam. 2. Wax-based release agent: natural waxes are divided into vegetable wax (Ka Nuoba wax) and mineral waxes (FT waxes); synthetic waxes (polyethylene wax). Wax mold release bond, after finishing machining is good, the price is cheaper, as paracetamol poly foam with a release agent easily get a lot of use. But the contamination of the mold releasing agent is more serious, requiring frequent mold cleaning.