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Supercritical polymerization preparation method and application of water-soluble solid styrene-acrylic resin

A styrene-acrylic resin and water-soluble technology, which is applied in the field of supercritical polymerization and supercritical polymerization preparation of water-soluble solid styrene-acrylic resin, can solve the problems of insignificant inhibition of esterification reaction, blockage of polymer pipes, increased pressure and the like , to achieve the effect of less volatile matter, good transparency and high product purity

Active Publication Date: 2014-04-02
恒昌涂料(惠阳)有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hanwha Petrochemical Co., Ltd. patent ZL99814773.7 discloses a method for preparing water-based solid styrene-acrylic resin by continuous bulk polymerization. The difference between this patent and the above-mentioned patent is that pure dipropylene glycol methyl ether is replaced by a mixed solvent of dipropylene glycol methyl ether and water Base ether, inhibit the esterification reaction of alcohol ether and acrylic acid, but when the mass content of water in the mixed solvent is lower than 20%, the inhibition effect on the esterification reaction is not obvious; if the water mass content is higher than 45%, the water will evaporate in large quantities , so that the pressure in the reactor increases significantly, which is unsafe
The patent CN200910039918.6 applied by Wang Xiaomei and Ma Chunping added fatty alkanol to the system, and carried out esterification reaction and free radical polymerization reaction in the tubular reactor at the same time to obtain products with lower molecular weight, but under high temperature and high pressure conditions If the polymer is viscous, the pipe may be blocked

Method used

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  • Supercritical polymerization preparation method and application of water-soluble solid styrene-acrylic resin

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Embodiment 1

[0027] Add 24Kg of styrene, 36Kg of α-methylstyrene, 32Kg of acrylic acid, 6Kg of isooctyl acrylate, 1Kg of α-methylstyrene dimer and 1Kg of peroxide to a 200L stirred reactor. tert-butyl 2-ethylhexanoate, close the autoclave. Open the air inlet, first blow carbon dioxide into the reactor to discharge the air in the reactor, close the valve, then start stirring, and heat the reactor; when the temperature rises to 60°C, a certain amount of Liquid carbon dioxide fully dissolves the monomer; when the temperature rises to 110°C, open the carbon dioxide cylinder, add carbon dioxide to the reaction kettle to the design reaction pressure, and set the reaction kettle pressure to 8MPa, 12MPa, 18MPa, and 20MPa respectively for synthesis experiments , After a reaction time of 1.5h, open the exhaust valve and slowly drop to normal pressure to obtain a white loose powdery solid styrene-acrylic resin, whose product numbers are A-1, A-2, A-3, and A-4.

[0028] Under different reaction press...

Embodiment 2

[0030] In this embodiment 1, the mass ratio of styrene and α-methylstyrene is changed by 1:2, 1:1, 2:1 respectively, and the amount of acrylic acid, isooctyl acrylate, chain transfer agent and initiator Remaining unchanged, the reaction pressure of the control system is 18MPa, the reaction temperature is 110°C, and the reaction time is 1.5h. The specific operation method is the same as in Example 1, and the numbers of the obtained solid styrene-acrylic resins are respectively B-1, B-2, and B -3. The synthetic formula is listed in Table 2, and the molecular weight and distribution of the synthetic products are listed in Table 3.

[0031] In embodiments 1 and 2, the styrene monomer can be one or more of styrene, α-methylstyrene, p-methylstyrene, o-chlorostyrene; The amount of styrene monomer accounts for 10-70% of the total mass of raw materials used for preparing the resin. The acrylic monomer can be acrylic acid and its esters; the acrylic acid is one or more of acrylic acid...

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Abstract

The invention discloses a preparation method and application of water-soluble solid styrene-acrylic resin. The preparation method comprises the following steps of: introducing supercritical fluid into a stirring reaction kettle as a reaction medium; adding a styrene monomer, an acrylic monomer, an initiator and a chain transfer agent to carry out radical polymerization reaction; and removing the volatile components and the supercritical fluid from a reaction product through exhausting and pressure reduction, thus the pure water-soluble solid styrene-acrylic resin is prepared, wherein the reaction temperature is equal to or higher than the critical temperature of a polymerization medium, the pressure is equal to or higher than the critical pressure of the polymerization medium, the critical temperature is 31.1 DEG C, and the critical pressure is 7.38MPa. The water-soluble solid styrene-acrylic resin prepared by the method avoids the condensation in the conventional preparation of the solid styrene-acrylic resin, obtains a polymer with narrower molecular weight distribution by adding the chain transfer agent alpha-methyl styrene dimmer and has good pigment wetting dispersity.

Description

technical field [0001] The invention belongs to supercritical polymerization technology in chemical industry, relates to the field of high molecular polymerization, in particular to a supercritical polymerization preparation method of water-soluble solid styrene-acrylic resin and its application. Background technique [0002] Various organic solvents in the chemical industry have caused serious pollution to the environment, so the non-toxic and non-polluting solvent system - supercritical fluid system has been paid more and more attention by people. Supercritical fluid refers to a fluid whose temperature and pressure are above its critical point, its state is between gas and liquid, and it has a density similar to that of liquid and a viscosity similar to gas. Therefore, supercritical fluids have incomparable advantages over traditional solvents in terms of solvency, flow performance and transfer performance. Although the solvent effect of supercritical fluids is ubiquitous...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F212/08C08F212/14C08F220/06C08F220/04C08F220/14C08F220/18C08F2/38C09D11/107C09D125/14C09D125/16C09D125/18C09D133/02C09D133/08
CPCY02P20/54
Inventor 马春平杨爱军王小妹李江涛
Owner 恒昌涂料(惠阳)有限公司
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