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UP the synthetic principle and process
by：CSSSLD
2021-01-23
Usually the oxidation -
Reduction system is by the organic peroxide and made from a suitable promoter.
Injection molding processing accelerator is a kind of activator can promote the decomposition of the initiator, can make the initiator decomposition at low temperatures to produce free radicals, and can accelerate the decomposition rate, shorten curing time.
Common room temperature curing system with ring already ketone peroxide/cobalt naphthenate and benzoic acid peroxide/dimethyl aniline, etc.
relative molecular quality control in 1000 - UP 7000. Increase of relative molecular mass, the mechanical properties of resin after curing, heat resistance, chemical properties, electrical performance will be improved. But the relative molecular mass is too big, can make UP the viscosity is too high, and the compatibility of crosslinking monomer, styrene is easy to produce delamination phenomenon. At the same time, the high viscosity resin solution will also bring difficulties to after processing. In the synthesis process of the UP, therefore, it is very important to properly control the size of relative molecular mass.
hot curing system which active low initiator system, critical temperature is higher, suitable for forming technique of some higher curing temperature, such as pressure molding, SMC, BMC. Usually these molding process temperature control in the 130 - The production of 140 ℃, choose activity more lower dicumyl peroxide, benzoic acid tert-butyl ester, such as initiator. Room temperature curing system of choice is to have a lower decomposition activation energy of oxidation - Reduction initiator system, this system can complete the curing process at room temperature, adapt in contact molding and injection molding.
the UP resin synthesis process including linear synthesis of unsaturated polyester and styrene with diluent liquid resin system two parts. UP on the industrial synthesis by melting polycondensation. First of all, the binary acid and dibasic alcohol according to certain proportion to join has ruled out the air in the reaction kettle, stainless steel - 170 210 ℃ for polycondensation reaction. Reaction end point by determining the acid value to control the system, when meet the acid value, is the reaction end point.
in the dilution kettle in advance in the styrene, inhibitor and so on the metering and mixing evenly, then open the reaction kettle bottom valve, make UP slowly into the dilution kettle, control flow mixing temperature does not exceed 90 ℃, dilution and cooling to room temperature, then through filtering, which has a certain viscosity liquid resin. The UP resin could cause by initiator or light, and other ways the molecular structure of the double bond and can be free radical polymerization of vinyl crosslinking monomer copolymerization reaction, make the linear unsaturated polyester molecular chain got behind alternating with three dimensional network structure size molecules, the process is the cure. UP the process of solidification is a forming process, through curing can produce a variety of UP plastic products.
the UP resin variety many, the differences mainly chooses different raw material monomer, mixed acid components in the different proportion of unsaturated acid and saturated acid, crosslinking monomer, the synthesis of different feeding way, etc. , which was synthesized with different properties of UP resin, adapt to the needs of different use injection molding plant. However, these resin synthesis principle and production process are broadly similar. Through the UP is by the dibasic alcohol, benzene anhydride and anhydride polycondensation, and then into a certain viscosity liquid diluted with styrene resin.
the UP resin curing principle for free radical copolymerization reaction and has the characteristics of free radical copolymerization reaction type, with a chain initiation, chain and chain termination of the three main stages. Used UP resin curing the initiator is a kind of molecule contains internal - O- O- Bond of organic peroxides, look from the chemical structure, this kind of compounds is not very stable, easy to decompose to produce free radicals, triggering unsaturated polyester and the double bond of styrene crosslinking copolymerization reaction. Of curing by heat or ambient temperature conditions can make UP the initiator or trigger system has many kinds, according to the forming temperature, can be roughly divided into heat curing system and two types of room temperature curing system.
more excellent articles: phenolic foam plastic, click directly.
http://www。 csssld。 cn//html/2017/Info_1031/711。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
relative molecular quality control in 1000 - UP 7000. Increase of relative molecular mass, the mechanical properties of resin after curing, heat resistance, chemical properties, electrical performance will be improved. But the relative molecular mass is too big, can make UP the viscosity is too high, and the compatibility of crosslinking monomer, styrene is easy to produce delamination phenomenon. At the same time, the high viscosity resin solution will also bring difficulties to after processing. In the synthesis process of the UP, therefore, it is very important to properly control the size of relative molecular mass.
hot curing system which active low initiator system, critical temperature is higher, suitable for forming technique of some higher curing temperature, such as pressure molding, SMC, BMC. Usually these molding process temperature control in the 130 - The production of 140 ℃, choose activity more lower dicumyl peroxide, benzoic acid tert-butyl ester, such as initiator. Room temperature curing system of choice is to have a lower decomposition activation energy of oxidation - Reduction initiator system, this system can complete the curing process at room temperature, adapt in contact molding and injection molding.
the UP resin synthesis process including linear synthesis of unsaturated polyester and styrene with diluent liquid resin system two parts. UP on the industrial synthesis by melting polycondensation. First of all, the binary acid and dibasic alcohol according to certain proportion to join has ruled out the air in the reaction kettle, stainless steel - 170 210 ℃ for polycondensation reaction. Reaction end point by determining the acid value to control the system, when meet the acid value, is the reaction end point.
in the dilution kettle in advance in the styrene, inhibitor and so on the metering and mixing evenly, then open the reaction kettle bottom valve, make UP slowly into the dilution kettle, control flow mixing temperature does not exceed 90 ℃, dilution and cooling to room temperature, then through filtering, which has a certain viscosity liquid resin. The UP resin could cause by initiator or light, and other ways the molecular structure of the double bond and can be free radical polymerization of vinyl crosslinking monomer copolymerization reaction, make the linear unsaturated polyester molecular chain got behind alternating with three dimensional network structure size molecules, the process is the cure. UP the process of solidification is a forming process, through curing can produce a variety of UP plastic products.
the UP resin variety many, the differences mainly chooses different raw material monomer, mixed acid components in the different proportion of unsaturated acid and saturated acid, crosslinking monomer, the synthesis of different feeding way, etc. , which was synthesized with different properties of UP resin, adapt to the needs of different use injection molding plant. However, these resin synthesis principle and production process are broadly similar. Through the UP is by the dibasic alcohol, benzene anhydride and anhydride polycondensation, and then into a certain viscosity liquid diluted with styrene resin.
the UP resin curing principle for free radical copolymerization reaction and has the characteristics of free radical copolymerization reaction type, with a chain initiation, chain and chain termination of the three main stages. Used UP resin curing the initiator is a kind of molecule contains internal - O- O- Bond of organic peroxides, look from the chemical structure, this kind of compounds is not very stable, easy to decompose to produce free radicals, triggering unsaturated polyester and the double bond of styrene crosslinking copolymerization reaction. Of curing by heat or ambient temperature conditions can make UP the initiator or trigger system has many kinds, according to the forming temperature, can be roughly divided into heat curing system and two types of room temperature curing system.
more excellent articles: phenolic foam plastic, click directly.
http://www。 csssld。 cn//html/2017/Info_1031/711。 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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