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High-heat-resistance polymethyl methacrylate (PMMA) resin and preparation method thereof

A technology of high heat resistance and resin, applied in the field of polymer resin, can solve the problems of increased distance between molecular chains, decreased weather resistance, increased absorption, etc., and achieves the effect of abundant sources and low cost

Inactive Publication Date: 2013-03-27
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Introducing the third monomer containing hydrophobic groups and MMA and MAAM copolymerization can also reduce the water absorption of copolymerized PMMA resin, such as styrene (St) and MMA and MAAM copolymerization (seeing Polymer, 2005,46 (7): 2354, Chang FC etc.), tricyclic methacrylate (5.2.1.0 2，6 ) decanyl ester (TCM) and MMA and MAAM copolymerization (see Polymer, 2010, 51 (4): 883, Chang FC, etc.) can reduce the water absorption of P (MMA-co-MAAM) resin, but the benzene ring The presence of TCM increases the near-ultraviolet absorption of the prepared material and decreases the weather resistance, while TCM increases the distance between the molecular chains of the copolymer and significantly reduces the glass transition temperature

Method used

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  • High-heat-resistance polymethyl methacrylate (PMMA) resin and preparation method thereof
  • High-heat-resistance polymethyl methacrylate (PMMA) resin and preparation method thereof
  • High-heat-resistance polymethyl methacrylate (PMMA) resin and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add 10g of MAAM (recrystallization) to 100g of MMA (reduced vacuum distillation) for bulk copolymerization, heat and stir, and feed nitrogen until the two are evenly mixed, and the liquid is clear and transparent. At this time, the temperature is 80°C. Then add 0.11g initiator (AIBN), stop heating when the system becomes a viscous glycerol-like liquid, pour it into a mold after cooling down to room temperature, and then put it in an oven to gradually increase the temperature for polymerization. The steps are: keep at 60°C for 18 hours , kept at 80° C. and 100° C. for 2 hours respectively, after the heat preservation was completed, it was naturally cooled to room temperature in an oven, and demoulded to obtain a transparent P(MMA-co-MAAM)-1 copolymer.

Embodiment 2

[0026] Repeat the steps of Example 1, just under the condition that the consumption of initiator is 0.15g, the MAAM monomer that the quality is 15g is joined in the MMA that quality is 100g bulk copolymerization, obtains transparent P (MMA-co-MAAM) -2 copolymers.

Embodiment 3

[0028] Repeat the steps of Example 1, just under the condition that the consumption of initiator is 0.12g, the MAAM monomer that is 20g is joined in the MMA that quality is 100g by mass copolymerization under the condition that the consumption of initiator is 0.12g, obtains transparent P (MMA-co-MAAM) -3 copolymers.

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Abstract

The invention discloses a high-heat-resistance polymethyl methacrylate (PMMA) resin and a preparation method thereof. The resin consists of two kinds of copolymers, namely a copolymer A and a copolymer P (MMA-co-MAA), and the mass ratio of the copolymer A to the copolymer P (MMA-co-MAA) is (0.25-4):1; the preparation method comprises the following steps of: melting and blending the copolymer A and the copolymer P (MMA-co-MAA) in the mass ratio at the temperature of 190 DEG C at the rotation speed of 32 revolutions / minute for 5 minutes, and then melting and blending at the rotation speed of 64 revolutions / minute for 5 minutes; and 2, hot-pressing in a hot press for 5 minutes, and cold-pressing for 10 minutes to obtain a mixed material. Compared with pure copolymerization modification, the method has the advantages that the heat resistance of the PMMA resin can be further improved, and Tg can reach 151 DEG C which is 15 higher than that of two kinds of copolymers and is 48 DEG C higher than that of homopolymerization PMMA. Water absorption of the copolymer can be reduced, the PMMA resin is high in light transmittance, the used monomers are low in toxicity, the resources are rich and cost is low.

Description

technical field [0001] The invention relates to a polymer resin, in particular to a high heat-resistant PMMA resin and a preparation method thereof. Background technique [0002] Polymethyl methacrylate (PMMA) has many excellent properties, such as excellent optical properties, balanced physical and mechanical properties, weather resistance, good electrical insulation, easy processing and molding, low cost, low density, light weight and toughness, etc. etc. Therefore, with the rapid growth of the optoelectronic industry, as well as the social needs of miniaturization in the field of electronics and electrical appliances, and lightweight in the automotive industry, PMMA has shown strong advantages. At present, PMMA resin has been widely used in agriculture, aviation, construction, optical instruments and other fields, commonly known as plexiglass. However, PMMA resin has disadvantages such as low heat distortion temperature, poor heat resistance, and easy moisture absorption...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L33/12B29C43/58
Inventor 刘国栋吴盼盼赵冬梅李丽霞
Owner HEBEI UNIV OF TECH