Application of the hottest organosilicon in plasti

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Application of organosilicon in the plastics, rubber and coating industries

Application of organosilicon in the plastics, rubber and coating industries

June 17, 2002

(1) the homogenizer for polyurethane foams

organosilicon homogenizer is usually a polydimethylsiloxane polyoxyalkylene block copolymer. Based on its unique surface properties (low surface tension, hydrophilic, lipophilic, stable bubbles), it becomes hard The effective homogenizer of soft polyurethane foam can make foam stable and uniform in size, and produce elastic foam with highly loose, uniform and fine pore structure. Its role in polyurethane foam is to emulsify the insoluble materials in the multiphase system into uniform dispersion, so that the chemical reaction between them can be carried out uniformly and effectively; Play the role of bubble nucleating agent at the beginning of the reaction; Reduce the surface activity and make the bubbles grow continuously and evenly distributed; Generate an elastic facial mask to prevent foam from bursting and make foam rise steadily

(2) application in resin and plastic modification

there are many varieties of silicone modified resin/plastic, mainly including the following:

① polyolefin resin. It can improve the yield and selectivity of olefin polymerization, cross-linking with water, improve flame retardancy, and improve

high voltage resistance

② polyvinyl chloride resin (PVC). It can not only improve the ductility, demoulding, reduce or prevent the precipitation of plasticizer,

maintain its mechanical strength, but also make the condensed water droplets on the surface of the film flow away quickly, so as to prevent the formation of water mist covering the surface and reduce the transparency

on the other hand ③ polystyrene resin (PS). It can improve impact strength, gloss and flame retardancy

④ polyamide resin (PA). Prevent the aggregation of powder in the production process, improve the low-temperature impact strength and lubricating performance of PA products, and do not affect the coatability of products

⑤ polyimide resin (PI). It can greatly improve the processability of PI, and has unique fracture toughness, adhesion, dielectric property, compatibility and oxidation resistance. It has been widely used in passivation and protective coatings of semiconductor devices

⑥ polycarbonate resin (PC). It can effectively reduce the melt viscosity, improve the low-temperature impact strength, and improve the abrasion resistance and solvent resistance

⑦ POM and POM. It can improve the lubrication effect and impact strength

⑧ polyphenylene sulfide (PPS) and polyphenylene oxide (PPO). PPS modification can improve its impact strength, mechanical strength

degree, electrical properties and moisture resistance without affecting its heat resistance. PPO modification can improve its ductility, injection molding property, flame retardancy and impact strength

⑨ acrylic resin. Improve the oxygen permeability of PMMA, and improve the weather resistance, water resistance, solvent resistance, wear resistance and gloss of acrylic paint

⑩ epoxy resin. Improve its softness and toughness, greatly reduce the glass transition temperature, reduce the number of thermal expansion system

and the coefficient of bending elasticity, and reduce the internal stress (thermal stress)

in addition, there are interpenetrating polymer complexes (IPN), silicone pellets for plastic modification and organic

silicon powder for plastic modification

(3) plastic surface protective coating

silicone resin is widely used as plastic surface. We will continue to transform our products into high transparent protective coatings with wear resistance and weather resistance, such as coatings for FRP lamps, optical plastic fibers, glass glasses and optical lenses

(4) casting makes the system become a mold for plastic casting of 1 open-loop system

when casting polystyrene, polyester resin, epoxy resin and other plastic products, silicone rubber is used to make the shell film, which has the advantages of easy demoulding and molding, realistic anti molding, good surface finish, good low temperature resistance and so on

2. Application in rubber modification

compounding silicone rubber with some synthetic rubber can effectively improve the service performance and function of synthetic rubber

(1) diene rubber

after modification can improve its heat resistance, weather resistance and ozone resistance, and can improve its dirt resistance, demoulding property,

resilience, processability, lubricity and wear resistance

(2) butyl rubber (isobutylene rubber)

the shock absorption effect is greatly affected by temperature. After modification, its temperature characteristics can be improved, and good shock absorption effect can be maintained in a wide temperature range. Xinda's industrial plan is to create the first production and marketing of high molecular composite materials for automobiles in China; In addition, in terms of innovative biodegradable materials, we will create the most complete industrial chain from lactide, polylactic acid to composite lactic acid

(3) ethylene propylene rubber (EPDM)

silicone EPDM has better heat resistance, weather resistance and compression set than EPDM, while its mechanical properties, heat resistance

water and steam properties are better than silicone rubber, and it also has good flame retardancy. It has been widely used in automotive radiators, heaters

(hoses, plugs, rubber tubes), heat-resistant parts around the engine, cathode ray tube anode cover, keyboard and electrical

parts Solar system components and rubber rollers, etc

(4) acrylic rubber (ACM)

poor cold resistance. The modification can not only improve the cold resistance, but also maintain the heat resistance of ACM

(5) fluororubber (FKM)

is expensive and has poor cold resistance (low temperature flexibility). After modification, it can effectively improve its low softness and smoothness, and can meet the requirements of low viscosity and maintenance free engine oil in the high-performance automobile, so it can replace some application fields of silicone rubber and fluorine

rubber, especially for those application fields that require good heat resistance, cold resistance and oil resistance, and the price cannot be too high

3. Silicone oil (or emulsified silicone oil) used as release agent in rubber and plastic processing has good lubrication and anti adhesion properties, does not corrode molds, is heat-resistant, resists

oxidation, and is insoluble in rubber and plastic, so it is an excellent release agent in rubber and plastic processing. It can reduce the

cycle cycle, save energy, improve the yield, and make the surface of the finished product have good smoothness

4. Application in the coating industry

(1) as the main material of various functional coatings,

silicone resin or organic resin modified silicone resin is the main material of functional coatings such as heat resistance, insulation, waterproof, weather resistance, radiation resistance and photosolization, which has been widely used in the coating industry

(2) defoaming, improving leveling, anti scaling, etc.

silicone oil is the most effective defoaming agent to prevent pot swelling during paint hot refining, which can improve the leveling of paint and prevent the blooming phenomenon caused by pigment separation in multicolor paint. Silicone oil or silicone grease can be used as an additive to hammer paint to increase the effect of hammer

. Another kind of silicone oil added to the coating can improve the leveling property of the coating and prevent the surface of the paint film from scaling, wrinkles

and other ills. Polyether modified silicone oil can also be used as an aqueous defoamer, and the effect is also ideal

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