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The synthesis of poly (methyl methacrylate
by：CSSSLD
2021-01-23
Reaction in the pressure tank, the temperature control in the 80 -
120 ℃, 2 h after the reaction can be completed.
Reaction products by washing, dehydration, drying, transparent hard small round bead form aggregate, aggregate can be directly used for molding, can be made into all kinds of mold plastic after eating according to need.
Suspension polymerization process control more easily, and polymer with low relative molecular mass, injection molding processing, such as extrusion molding processing can be performed.
But to join in the process of polymerization dispersant residue in products, such as resin and its purity as ontology method.
acetone cyanohydrin method is the traditional industrial production of methyl methacrylate, mature technology, high unit yield, still is the important method of producing methyl methacrylate. Acetone cyanohydrin method using acetone as raw materials, the reaction of acetone in the first place and hydrocyanic acid addition of acetone cyanohydrin, the latter and methanol were hot, at the same time to undertake dehydration, hydrolysis, esterification, namely methyl methacrylate. Production of the cyanide wastewater and esterification residual night can cause environmental pollution, aeration or burning method for processing must be taken.
bulk polymerization product, high relative molecular weight of up to 100000 or so, and less impurity, with high transparency. Usually, bulk polymerization reactor is mould, after the reaction, can obtain the same shape and die products, mainly include plates, rods, tubes, etc. The suspension polymerization of methyl methacrylate using water as medium, with two benzoyl peroxide as initiator, dispersant have talcum powder, magnesium carbonate, polyvinyl alcohol, etc.
isobutylene hydrocyanic acid in the oxidation method with acetone cyanohydrin method is toxic, with the development of petroleum industry, the synthesis methods of diversity, isobutene oxidation generated methyl methacrylate (mma) is one of a kind of important. Isobutene oxidation synthesis of methyl methacrylate to three chemical reaction: first the isobutylene by four oxidation and nitrogen nitrate melt oxidation, generate 2 - Methyl - Nitrocellulose propionic acid, and then hydrolyzed into a minus Hydroxy isobutyric acid, and finally by dehydration, esterification of methyl methacrylate (mma).
isobutylene from oil exhaust, cheap, is not applicable to the highly toxic cyanide, generation cost is lower than acetone cyanohydrin method, simple process, easy to operate. In addition, PMMA processing scrap and waste products through thermal cracking recycling methyl methacrylate monomers. According to the mechanism of free radical polymerization, methyl methacrylate can be bulk polymerization, suspension polymerization, solution polymerization and emulsion polymerization. Through different polymerization methods, different properties and USES of polymer. Usually USES the ontology method and production of PMMA resin suspension method, solution polymerization and emulsion polymerization is limited to production coatings and adhesives, etc.
methyl methacrylate (mma) is a colorless transparent liquid at room temperature, have certain toxicity, boiling point is 100 - 101 ℃, volatile strong, heavy steam has strong stimulation to human senses. Under the atmospheric pressure in air volume fraction of 2. 12% - 12. 5%, meet spark explosion extremely easily, and therefore should be pay attention to in the storage and transportation. Synthesis methods of methyl methacrylate is more, the acetone cyanohydrin method and oxidation of isobutene method to industrial production methods.
because bulk polymerization heat difficult, automatic acceleration phenomenon obviously, in the process of reaction in industrial production in polymerization of three stages: pre - polymerization, polymerization and heat treatment. First in monomer adding quantitative initiator, plasticizer, release agent, etc in the normal reaction kettle pre-aggregated, reaction temperature control in the 90 - After 95 ℃, for the conversion of about 10%, pouring into the system in advance good mould in the 40 - injection molding plant 50 ℃ under the polymerization time, when the conversion rate of 90% Again, after a 95% rise in temperature, the 100 - Under the 120 ℃ high temperature treatment, completely the monomer reaction.
more excellent articles: the performance of ABS, click directly.
http://www。 csssld。 cn//html/2017/Info_1006/692。 HTML
changshu smoothly da plastic products factory website: http://www. csssld。 Cn /
more wonderful articles, immediately search: changshu da plastic products factory smoothly
acetone cyanohydrin method is the traditional industrial production of methyl methacrylate, mature technology, high unit yield, still is the important method of producing methyl methacrylate. Acetone cyanohydrin method using acetone as raw materials, the reaction of acetone in the first place and hydrocyanic acid addition of acetone cyanohydrin, the latter and methanol were hot, at the same time to undertake dehydration, hydrolysis, esterification, namely methyl methacrylate. Production of the cyanide wastewater and esterification residual night can cause environmental pollution, aeration or burning method for processing must be taken.
bulk polymerization product, high relative molecular weight of up to 100000 or so, and less impurity, with high transparency. Usually, bulk polymerization reactor is mould, after the reaction, can obtain the same shape and die products, mainly include plates, rods, tubes, etc. The suspension polymerization of methyl methacrylate using water as medium, with two benzoyl peroxide as initiator, dispersant have talcum powder, magnesium carbonate, polyvinyl alcohol, etc.
isobutylene hydrocyanic acid in the oxidation method with acetone cyanohydrin method is toxic, with the development of petroleum industry, the synthesis methods of diversity, isobutene oxidation generated methyl methacrylate (mma) is one of a kind of important. Isobutene oxidation synthesis of methyl methacrylate to three chemical reaction: first the isobutylene by four oxidation and nitrogen nitrate melt oxidation, generate 2 - Methyl - Nitrocellulose propionic acid, and then hydrolyzed into a minus Hydroxy isobutyric acid, and finally by dehydration, esterification of methyl methacrylate (mma).
isobutylene from oil exhaust, cheap, is not applicable to the highly toxic cyanide, generation cost is lower than acetone cyanohydrin method, simple process, easy to operate. In addition, PMMA processing scrap and waste products through thermal cracking recycling methyl methacrylate monomers. According to the mechanism of free radical polymerization, methyl methacrylate can be bulk polymerization, suspension polymerization, solution polymerization and emulsion polymerization. Through different polymerization methods, different properties and USES of polymer. Usually USES the ontology method and production of PMMA resin suspension method, solution polymerization and emulsion polymerization is limited to production coatings and adhesives, etc.
methyl methacrylate (mma) is a colorless transparent liquid at room temperature, have certain toxicity, boiling point is 100 - 101 ℃, volatile strong, heavy steam has strong stimulation to human senses. Under the atmospheric pressure in air volume fraction of 2. 12% - 12. 5%, meet spark explosion extremely easily, and therefore should be pay attention to in the storage and transportation. Synthesis methods of methyl methacrylate is more, the acetone cyanohydrin method and oxidation of isobutene method to industrial production methods.
because bulk polymerization heat difficult, automatic acceleration phenomenon obviously, in the process of reaction in industrial production in polymerization of three stages: pre - polymerization, polymerization and heat treatment. First in monomer adding quantitative initiator, plasticizer, release agent, etc in the normal reaction kettle pre-aggregated, reaction temperature control in the 90 - After 95 ℃, for the conversion of about 10%, pouring into the system in advance good mould in the 40 - injection molding plant 50 ℃ under the polymerization time, when the conversion rate of 90% Again, after a 95% rise in temperature, the 100 - Under the 120 ℃ high temperature treatment, completely the monomer reaction.
more excellent articles: the performance of ABS, click directly.
http://www。 csssld。 cn//html/2017/Info_1006/692。 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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