PC/PMMA alloy as well as preparation method and application thereof

A technology of alloy and copolymer, which is applied in the field of PC/PMMA alloy and its preparation, can solve the problems of complex process and pearlescent, and achieve the effects of high light transmittance, low cost and small creep

Pending Publication Date: 2020-12-11
GUANGZHOU HUAXINKE ENTERPRISE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, since the refractive index of homopolymer PMMA is 1.49 and that of PC is 1.586, there is a big difference, and the two are also partially compatible systems. Pearlescent phenomenon due to refraction
Moreover, the combination of existing PMMA and PC is generally combined by making a composite plate, and the process is complicated.

Method used

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  • PC/PMMA alloy as well as preparation method and application thereof
  • PC/PMMA alloy as well as preparation method and application thereof
  • PC/PMMA alloy as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0071] In one embodiment, the preparation method of the polymethyl methacrylate copolymer comprises the following steps:

[0072] The main monomer, comonomer, solvent and initiator are mixed and reacted.

[0073] Preferably, the solvent is water, THF, DMF; and / or, the initiator is selected from azobisisobutyronitrile (AIBN) or dibenzoyl peroxide; and / or, the reaction temperature is 60-100℃. Preferably, the initiator is AIBN, and the reaction temperature is 70-90°C.

[0074] Preferably, the preparation method of the polymethyl methacrylate copolymer comprises the following steps:

[0075] The main monomers are mixed in proportion, recorded as 100 parts (weight parts), 0.1-0.2 parts of initiator are added, and 8-12 times the volume of water is added, and mixed under mechanical stirring, and the stirring speed is 500r / min, The reaction was carried out at 80°C for 4 hours. After the reaction, spherical particles were obtained, which were vacuum-dried at 70° C. for 4 hours and ...

Embodiment 1

[0098] This embodiment provides a PC / PMMA alloy and a preparation method thereof.

[0099] (1) PC / PMMA alloy is prepared from the raw material of following mass fraction in the present embodiment:

[0100]

[0101] The polymethyl methacrylate copolymer in this embodiment is prepared by free-radical copolymerization of methyl methacrylate and phenyl methacrylate in a molar ratio of 65:35, and the molecular weight is about 20,000 g / mol; PC is Bisphenol A type PC, the molecular weight is about 30000g / mol.

[0102] (2) preparation method is as follows:

[0103] S1 Preparation of polymethyl methacrylate copolymer: Mix the two monomers according to the molar ratio of 65:35, record it as 100 parts (weight parts), then add 0.2 parts of initiator and 10 times the volume of water, mechanically The mixture was mixed under stirring, the stirring speed was 500 r / min, and the reaction was carried out at 80° C. for 4 hours. After the reaction, spherical particles were obtained, which w...

Embodiment 2

[0106] This embodiment provides a PC / PMMA alloy and a preparation method thereof.

[0107](1) PC / PMMA alloy is prepared from the raw materials of following mass fractions in the present embodiment:

[0108]

[0109] The polymethyl methacrylate copolymer in this example is prepared by free radical copolymerization of methyl methacrylate and phenyl methacrylate in a molar ratio of 65:35, with a molecular weight of about 20,000 g / mol; PC is Bisphenol A type PC, the molecular weight is about 30000g / mol.

[0110] (2) The preparation method is as follows:

[0111] S1 prepares polymethyl methacrylate copolymer: same as embodiment 1.

[0112] S2 prepares PC / PMMA alloy: the above S1 polymethyl methacrylate copolymer and PC, compatibilizer, antioxidant, chain extender are fully mixed and then extruded by 35 co-rotating twin-screw extruders, extrusion temperature : 240°C-260°C, PC / PMMA alloy 2 was obtained.

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Abstract

The invention relates to a PC/PMMA alloy and a preparation method and application thereof. The alloy is prepared from the following raw materials in parts by weight: 60-95 parts of PC, 8-40 parts of polymethyl methacrylate copolymer and 0.1-1 part of compatilizer, wherein the polymethyl methacrylate copolymer is formed by copolymerizing a main body monomer and a comonomer according to a molar ratio of (1.5:1) to (4:1); the main body monomer is methyl methacrylate; the comonomer is selected from at least one of benzyl methacrylate, phenyl methacrylate and methyl methylphenylmethacrylate, and the refractive indexes of the polymethyl methacrylate copolymer and the PC are similar, and the compatilizer can improve the compatibility of the polymethyl methacrylate copolymer and the PC, so that the PC/PMMA alloy has the advantages of high transparency, high light transmittance, high hardness and scratch resistance.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a PC / PMMA alloy and its preparation method and application. Background technique [0002] With the advent of the 5G era, the demetallization of mobile phone backplanes has become the general trend. However, transparent materials such as 3D glass and ceramics are expensive, and they are concentrated in high-end models. type penetration. [0003] Polymethacrylate (PMMA for short) has high surface hardness and better light transmittance, but its mechanical properties are poor, and it is prone to stress whitening and cracking, which affects its use. Polycarbonate (PC for short), as a common transparent engineering plastic, has unique advantages in the field of mobile phone back covers due to its low price, high impact strength, high light transmittance, excellent electrical properties, excellent insulation, and low creep. However, due to the low surface hardness of PC, scratches ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L69/00C08L33/12C08L51/04C08L25/14
CPCC08L69/00C08L2205/08C08L2203/20C08L2201/10C08L2205/035
Inventor 余波贾雷钱玉英杨智韬
Owner GUANGZHOU HUAXINKE ENTERPRISE
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