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Phenolic foam
by：CSSSLD
2021-01-23
Phenolic foam plastic heat resistance, dimensional stability, good electrical insulation, etc;
Flame retardant performance, usually oxygen index in more than 30, even also no extension, no direct contact with the flame drop and toxic gases, low density phenolic foam for more open pore structure, has a good buffer and damping performance, but the thermal conductivity and bibulous rate is higher.
The phenolic foam plastic injection tooling first applied in aviation, spaceflight, insulation board, etc.
physical foaming agent fluorine carbon compounds can be used, but it has damage to the ecological environment, to reduce the consumption of atmospheric ozone layer, developed the low boiling point of alkanes and chlorinated hydrocarbons, such as dichloromethane, n-hexane, cyclohexane, petroleum ether, etc. Commonly used chemical blowing agent AC, sodium bicarbonate, etc. General PF use six four methylene amine acid method, alkaline or PF use hydrochloric acid, phosphoric acid, the methyl benzene sulfonic acid, phenol sulfonic acid, etc.
on the basis of the intermittent method developed in recent years continuous process manufacturing phenolic foam plastic, the main characteristic of this method is that, the ingredients, mixing, casting and molding for continuous operation, high production efficiency, suitable for large scale continuous manufacturing phenolic foam plastic plate. Acid preparation method of phenolic foam acid method is first PF the water enrichment for solid powder, and other components of the foaming agent and modifying agent, curing agent and solid foam mixture, after mixing into the mold cavity. Die heating, mixture reached around 135 ℃, resin melting, decomposition of foaming agent produces gas expansion foam in the sealed cavity, and curing. Mould can be obtained with dense surface closed pore structure of phenolic foam plastic molding products.
surfactants can reduce the surface tension, is conducive to form fine bubble, reduce the gas diffusion effect, make the bubble hole temperature and uniform. Proper use of surfactant of phenolic foam plastics molding process control plays an important role. Cationic and anionic surfactant can be used in PF foam system, siloxane class nonionic surface active effect is best. Modifying agent can effectively improve the performance of the phenolic foam plastic, may need to choose according to the performance of the products.
phenolic foam plastic production technology with alkaline and acid method, two kinds of phenolic foam plastics. Commonly used method of intermittent alkaline phenolic foam, also called pouring method. First of all components according to the foaming ratio of components of the precise measurement, and then resin, surface active agent, foaming agent and other additives in stirring mixer, make each component mixing evenly, then adding acid catalyst, fully mixing them. In this process, resin in acidic curing agent under the action of polycondensation reaction and curing, the reaction heat emitted by the physical foaming agent produces gas heating volatilization, or additional chemical foaming agent under the effect of acid decomposition and produce gas, the gas mixture will cause foaming.
in PF phenolic foam as the main raw material, the foaming agent, surface active agent, curing agent and other additives was prepared under the action of thermosetting plastics. Acid method PF generally use chemical foaming, alkaline or PF generally adopting physical foaming, the latter process is easier to control, more widely applied. In the production of phenolic foam plastics raw materials in addition to the resin, foaming agent, surface active agent, curing agent, modifier and so on.
because of foaming and curing at the same time, the mixture viscosity will rise rapidly, so you must quickly poured mixture injection mold cavity injection molding factory, after being completely curing mold release, a quick rigid phenolic foam plastic products. For the convenience of products mold release and clean up the mold, should be in before every casting mold release agent on the mold cavity wall spray. The intermittent method producing phenolic foam plastic products one of the biggest advantages is convenient operation and less equipment investment. Casting defect is by hand the intensity of labor is big, the production efficiency is low, uneven density of foam molding products, products surface quality is poor, raw material loss.
more excellent articles: phenolic resin acid method, click directly.
http://www。 csssld。 cn//html/2017/Info_1030/710。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
physical foaming agent fluorine carbon compounds can be used, but it has damage to the ecological environment, to reduce the consumption of atmospheric ozone layer, developed the low boiling point of alkanes and chlorinated hydrocarbons, such as dichloromethane, n-hexane, cyclohexane, petroleum ether, etc. Commonly used chemical blowing agent AC, sodium bicarbonate, etc. General PF use six four methylene amine acid method, alkaline or PF use hydrochloric acid, phosphoric acid, the methyl benzene sulfonic acid, phenol sulfonic acid, etc.
on the basis of the intermittent method developed in recent years continuous process manufacturing phenolic foam plastic, the main characteristic of this method is that, the ingredients, mixing, casting and molding for continuous operation, high production efficiency, suitable for large scale continuous manufacturing phenolic foam plastic plate. Acid preparation method of phenolic foam acid method is first PF the water enrichment for solid powder, and other components of the foaming agent and modifying agent, curing agent and solid foam mixture, after mixing into the mold cavity. Die heating, mixture reached around 135 ℃, resin melting, decomposition of foaming agent produces gas expansion foam in the sealed cavity, and curing. Mould can be obtained with dense surface closed pore structure of phenolic foam plastic molding products.
surfactants can reduce the surface tension, is conducive to form fine bubble, reduce the gas diffusion effect, make the bubble hole temperature and uniform. Proper use of surfactant of phenolic foam plastics molding process control plays an important role. Cationic and anionic surfactant can be used in PF foam system, siloxane class nonionic surface active effect is best. Modifying agent can effectively improve the performance of the phenolic foam plastic, may need to choose according to the performance of the products.
phenolic foam plastic production technology with alkaline and acid method, two kinds of phenolic foam plastics. Commonly used method of intermittent alkaline phenolic foam, also called pouring method. First of all components according to the foaming ratio of components of the precise measurement, and then resin, surface active agent, foaming agent and other additives in stirring mixer, make each component mixing evenly, then adding acid catalyst, fully mixing them. In this process, resin in acidic curing agent under the action of polycondensation reaction and curing, the reaction heat emitted by the physical foaming agent produces gas heating volatilization, or additional chemical foaming agent under the effect of acid decomposition and produce gas, the gas mixture will cause foaming.
in PF phenolic foam as the main raw material, the foaming agent, surface active agent, curing agent and other additives was prepared under the action of thermosetting plastics. Acid method PF generally use chemical foaming, alkaline or PF generally adopting physical foaming, the latter process is easier to control, more widely applied. In the production of phenolic foam plastics raw materials in addition to the resin, foaming agent, surface active agent, curing agent, modifier and so on.
because of foaming and curing at the same time, the mixture viscosity will rise rapidly, so you must quickly poured mixture injection mold cavity injection molding factory, after being completely curing mold release, a quick rigid phenolic foam plastic products. For the convenience of products mold release and clean up the mold, should be in before every casting mold release agent on the mold cavity wall spray. The intermittent method producing phenolic foam plastic products one of the biggest advantages is convenient operation and less equipment investment. Casting defect is by hand the intensity of labor is big, the production efficiency is low, uneven density of foam molding products, products surface quality is poor, raw material loss.
more excellent articles: phenolic resin acid method, click directly.
http://www。 csssld。 cn//html/2017/Info_1030/710。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
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