Preparation method of unsaturated polyester resin low shrinking agent

A technology of polyester resin and low-shrinkage agent, applied in the field of preparation of unsaturated polyester resin low-shrinkage agent

Active Publication Date: 2015-02-18
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

General low-shrinkage agents include polystyrene (PS), polymethyl methacrylate (PMMA), polyvinyl acetate (PVAc), polyurethane, and thermoplastic polyester, etc., usually there is a contradiction between shrinkage rate and difficult coloring, particle size control Difficult and high usage (20%) issues

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The polymerization steps are as follows:

[0031] (1) Preparation of seed latex particles:

[0032] Mix 10 parts of liquid nitrile rubber, 1 part of nano-silica and 0 part of coupling agent and add it dropwise to the 110 parts of aqueous solution (the mass ratio of water to the mixture is 1:10), and use high-intensity dispersion for 30 minutes, during which the temperature of the dispersion is kept below room temperature with ice water.

[0033] (2) Preparation of latex particles with core-shell morphology:

[0034] Method (1) Heat the seed latex particles prepared to 70°C, mix 4 parts of styrene and 1.5 parts of acrylonitrile monomer (the monomer is 50% of the mass of the mixture in step 1), and add 0.1% of the mixed monomer persulfuric acid Potassium, the polymerization adopts the method of full dropwise addition, and the dropwise addition time is three hours, and the total polymerization time is 4 hours, and the latex particles prepared are cooled to room temperatu...

Embodiment 2

[0039] The polymerization steps are as follows:

[0040] (1) Preparation of seed latex particles:

[0041] Mix 9.9 parts of polyisoprene rubber, 9.0 parts of nano-silica and 0.3 parts of KH570 into 1 part of sodium dodecylbenzenesulfonate and 0.092 parts of nonylphenol polyoxyethylene ether (OP-10) at one time ( The amount of emulsifier is 1920 parts of aqueous solution (the mass ratio of water and mixture is 1:100) of the mixture (1.0% by weight of the mixture), and it is dispersed by vigorous stirring for 30 minutes, during which the temperature of the dispersion is kept below room temperature with ice water.

[0042] (2) Preparation of latex particles with core-shell morphology:

[0043] The seed latex particles prepared by method (1) were heated to 70°C, and 180 parts of methyl methacrylate, 10 parts of hydroxyethyl acrylate monomer and 2.0 parts of styrene were mixed (the monomer was 1000% of the mass of the mixture in step 1), Add 0.91 parts of ammonium persulfate and ...

Embodiment 3

[0048] The polymerization steps are as follows:

[0049] (1) Preparation of seed latex particles:

[0050] Mix 75 parts of polyurethane rubber (synthesized with polyethylene glycol 2000 and p-toluene isocyanate), 22 parts of nano-titanium dioxide and 3 parts of tetrabutyl titanate slowly to 0.5% mass concentration of nonylphenol polyoxyethylene ether (OP-10 ) and 1000 parts of an aqueous solution of dodecyl ammonium chloride with a mass concentration of 0.5% and stirred, and used high-intensity dispersion for 30 minutes, during which the temperature of the dispersion was kept lower than room temperature with ice water.

[0051] (2) Preparation of latex particles with core-shell morphology:

[0052] Method (1) Heat the seed latex particles prepared to 70°C, mix 25 parts of methyl methacrylate, 0.5 parts of hydroxyethyl acrylate monomer and 24.5 parts of styrene, and add 0.05% ammonium persulfate for each monomer and benzoyl peroxide, the mixed monomers are charged at one time...

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Abstract

The invention relates to a preparation method of an unsaturated polyester resin low shrinking agent and belongs to the field of macromolecule polymerization. The preparation method comprises the following steps: (1) preparation of seed latex particles, to be specific, uniformly mixing liquid rubber or elastomers, nanoinorganic particles and coupling agents, dropwise adding or adding into an aqueous solution containing certain emulsifying agents by adopting a one-time method at a low speed, wherein the mass ratio of water to a mixture is 1: (10-100); carrying out high-strength stirring for 30 minutes at a certain temperature for standby; (2) preparation of latex particles with core-shell forms, to be specific, dropwise adding a vinyl monomer or a mixed monomer of one or more of monomers into seed emulsion dispersed in the step (1) by adopting a certain method, adding an initiator, polymerizing at a temperature of 70 DEG C, reacting for 4 hours and cooling to a room temperature after the completion of preparation. The low shrinking agent has the benefits that the shrinkage rate of cured unsaturated polyester resin is lower, the coloring problem of the unsaturated polyester resin can be obviously improved, and the usage amount of the low shrinking agent is obviously reduced.

Description

Technical field: [0001] The invention belongs to the field of macromolecular polymerization, and in particular relates to a preparation method of an unsaturated polyester resin low-shrinkage agent by emulsion polymerization. Background technique: [0002] Unsaturated polyester resin (UPR) is produced by condensation polymerization of unsaturated dibasic acid and / or saturated dibasic acid and diol. Usually the UPR molecular chain contains unsaturated double bonds, so it can be copolymerized with double bond-containing monomers (diluents), such as styrene, methylstyrene, etc., to form a three-dimensional structure, forming an insoluble and infusible thermosetting plastic. It is an important variety in the development of modern plastic industry, and it is widely used in industry, agriculture, transportation, construction and national defense industry. Because unsaturated polyester generally has disadvantages such as poor toughness, low strength, easy burning and large shrin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F279/04C08F279/06C08F283/00C08F283/12C08F220/14C08F220/28C08F212/08C08F218/08C08F2/26C08F2/30C08K3/36C08K3/22C08K3/26C08L51/04C08L51/08
Inventor 张震乾吉祥王佩何剑虹
Owner CHANGZHOU UNIV
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