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Styrene-(methyl)acrylate copolymer as well as preparation method and application thereof

An acrylate and copolymer technology, applied in the field of polymers, can solve problems such as difficult to meet performance requirements, low melt strength, low molecular weight of MS polymers, etc., to achieve improved entanglement ability, improved processing performance, and low hygroscopicity Effect

Pending Publication Date: 2021-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the molecular weight of MS polymers in the prior art is not high, and the weight-average molecular weight Mw is between 60,000 and 200,000. The molecules are mainly linear structures, and the melt strength is low. Difficult to meet performance requirements during processing

Method used

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  • Styrene-(methyl)acrylate copolymer as well as preparation method and application thereof
  • Styrene-(methyl)acrylate copolymer as well as preparation method and application thereof
  • Styrene-(methyl)acrylate copolymer as well as preparation method and application thereof

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preparation example Construction

[0026] A second aspect of the present invention provides a method for preparing a styrene-(meth)acrylate copolymer, the method comprising: carrying out a styrene-based monomer and a (meth)acrylate-based monomer under an initiator system polymerization to obtain the styrene-(meth)acrylate copolymer; based on the total weight of the monomers, the amount of the styrene-based monomer is 10wt% to 95wt%, preferably 30wt% to 90wt%, More preferably 50wt% to 80wt%, the amount of the (meth)acrylate monomer is 5wt% to 90wt%, preferably 10wt% to 70wt%, more preferably 20wt% to 50wt%; and, the The total amount of styrene-based monomers and the (meth)acrylate-based monomers is more than 90wt%;

[0027] Wherein, the initiator system contains a multifunctional initiator, and the multifunctional initiator has more than three functional groups that can form free radicals, and, based on the total weight of the initiator system, the content of the multifunctional initiator 50 wt% or more.

[00...

Embodiment approach

[0030] According to a preferred embodiment of the present invention, the multifunctional initiator is a tetrafunctional peroxide having a structure shown in formula I or a structure shown in formula II;

[0031]

[0032] Wherein, R is a multifunctional group core, such as cyclohexyl, dicyclohexylpropanyl, R 1 , R 2 , R 3 each independently substituted or unsubstituted C 1 ~C 5 alkyl.

[0033] In the present invention, various four-functional peroxide initiators conventional in the art can be selected, which can be self-made or commercially purchased. Specifically preferably, the initiator is 2,2-bis(4,4-bis(tert-butylperoxy)cyclohexyl)propane, [6,6-bis(5-a-bromoisobutyryloxy- At least one of 2-oxopentane)-4,8-dioxundecanediol 1,11] bis(a-bromoisobutyrate) and tetra-t-butyl peroxytetracarbonate. The tetra-t-butyl peroxytetracarbonate is, for example, commercialized JWEB50.

[0034]In the present invention, monofunctional peroxides, bifunctional peroxides and multifunc...

Embodiment 1

[0059] The mass ratio of styrene monomer and methyl methacrylate monomer is 7:3, the amount of solvent ethylbenzene accounts for 8wt% of the total amount of the reaction system, and the initiator is selected from four functional group peroxides 2,2-bis(4,4 - Di(tert-butylperoxy)cyclohexyl)propane in an amount of 800 ppm (relative to styrene monomer). The polymerization temperature in the first reactor (CSTR) is 106° C., the pressure is 0.05 MPaA, and when the monomer conversion rate reaches 21%, the reaction mixture is pumped into the second reactor (PFR). The polymerization temperature in the second reactor is 120-135° C., the pressure is 2.1 MPaA, and the monomer conversion rate is 46%, the reaction mixture is pumped into the third reactor (PFR). The polymerization temperature of the third reactor is 135-154°C, the pressure is 1.5MPaA, and when the monomer conversion rate is 71%, the reaction mixture is pumped into the fourth reactor (PFR); the polymerization temperature of ...

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Abstract

The invention belongs to the field of polymers, and relates to a styrene-(methyl)acrylate copolymer as well as a preparation method and application thereof. The copolymer contains a structural unit A derived from a styrene monomer and a structural unit B derived from a (methyl)acrylate monomer. Based on the total weight of the copolymer, the content of the structural unit A is 10wt%-95wt%; the content of the structural unit B is 5wt%-90wt%; the total content of the structural unit A and the structural unit B is 90 wt% or more; the weight-average molecular weight of the copolymer is 200,000 or more; and the ratio Mw.Mall / Mw.GPC of the absolute molecular weight of the copolymer to the weight-average molecular weight of GPC is 1.1-2.5. The styrene-(methyl)acrylate copolymer has the performance characteristics of PS and PMMA, and the molecular chain of the styrene-(methyl)acrylate copolymer has a long branched chain structure, so that the processability of the material in a molten state can be remarkably improved.

Description

technical field [0001] The invention belongs to the field of polymers, and relates to a styrene-(meth)acrylate copolymer and a preparation method of a styrene-(meth)acrylate copolymer, and the styrene-(meth)acrylate copolymer prepared by the method base) acrylate copolymer, and the application of said styrene-(meth)acrylate copolymer. Background technique [0002] Polystyrene (PS) is transparent, has good rigidity and low hygroscopicity, but has poor toughness and poor weather resistance. Polymethyl methacrylate (PMMA) has high light transmittance and good toughness, but it has high hygroscopicity and is easy to cause deformation of the finished product. Therefore, more and more technical methods use styrene and methyl methacrylate as the main raw materials to obtain styrene-methyl methacrylate copolymer (MS). MS combines polystyrene and polymethyl methacrylate. It not only has the good processing fluidity and low hygroscopicity of polystyrene, but also has the weather res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/08C08F220/14C08F4/36C08L25/14G02B1/04
CPCC08F212/08C08F4/36C08L25/14G02B1/04G02B1/041C08F220/14C08F2500/11C08F2500/01
Inventor 斯维张晓尘宋文波
Owner CHINA PETROLEUM & CHEM CORP
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