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Preparation of high closeness polyacrylacid ester dispersion

A technology of polyacrylate and alkyl acrylate, which is applied in the application field of highly closed polyacrylate dispersion and its preparation, and in the preparation of water-based wood coatings, can solve the problems of easy adhesion, bleeding, yellowing, etc., and achieve The effect of low gel rate, fast drying, and small amount of emulsifier added

Inactive Publication Date: 2009-07-15
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the current water-based wood coatings cannot seal the harmful VOC gases contained in the boards, such as formaldehyde, from escaping and polluting the indoor environment. Adhesion and other problems, provide a high sealing polyacrylate dispersion with strong sealing, anti-blocking and excellent comprehensive performance and its preparation method

Method used

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  • Preparation of high closeness polyacrylacid ester dispersion
  • Preparation of high closeness polyacrylacid ester dispersion
  • Preparation of high closeness polyacrylacid ester dispersion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The monomer composition is butyl acrylate, methyl methacrylate, methacrylic acid, diacetone acrylamide, ethylene urea ethoxy methacrylate, and its components are listed in Table 1.

[0064] Table 1 Polyacrylate dispersion formula

[0065]

[0066] Add 2.7 parts of compound emulsifier, buffer, and 32.92 parts of deionized water into the reaction kettle, stir at high speed for 20 minutes, and raise the temperature to 55°C, add 0.4 parts of methacrylic acid, 8.4 parts of butyl acrylate, 16 Mixed monomers of methyl methacrylate, raise the temperature of the reactor to 82°C, slowly add part of the initiator solution dropwise, wait until the seed dispersion is in a blue phase and stabilize for half an hour, add the pre-emulsified dropwise within 1.5 hours For the core monomer, continue to drop the pre-emulsified shell monomer within 2 hours after an interval of 20 minutes. After adding all the monomers, add 4 parts of 10% aqueous initiator solution, raise the temperature t...

Embodiment 2

[0071] Using the acrylate dispersion prepared in Example 1, the wood coating formulation was prepared as shown in Table 2.

[0072] Table 2 Waterborne wood coating formulations

[0073]

[0074] The preparation method is as follows: firstly add raw materials No. 2-8 into the stirring tank, disperse with a high-speed disperser for 10-30 minutes, then slowly add the acrylic acid dispersion into the stirring tank, stir at a medium speed for 30-60 minutes, adjust with ammonia water The pH value of the paint, when the pH value is qualified, it is filtered, discharged and packaged. Properties of the prepared wood coating: Appearance: milky white slightly transparent liquid without mechanical impurities; pH=7-9; solid content 35-40%, viscosity 30-200cps. Wood coating film performance: Pencil hardness of coating film: HB; water resistance: no obvious change after soaking in water for 48 hours; adhesion: level 1; flexibility: level 1; excellent sealing; anti-adhesion: level A.

Embodiment 3

[0076]The monomer composition is butyl acrylate, methyl methacrylate, methacrylic acid, diacetone acrylamide, and methacrylamide, and its component formula is shown in Table 3:

[0077] Table 3 Polyacrylate dispersion formula

[0078]

[0079] Add 4.0 parts of compound emulsifier, buffer, and 51.92 parts of deionized water into the reactor, stir at high speed for 20 minutes, and raise the temperature to 55°C. Within 20 minutes, 0.5 parts of methacrylic acid, 10.5 parts of styrene, 22.5 Part of butyl methacrylate mixed monomer, raise the temperature of the reactor to 82°C, slowly add part of the initiator solution dropwise, wait until the seed dispersion is in a blue phase and stabilize for half an hour, drop the pre-emulsified solution within 1.5 hours For the core monomer, continue to drop the pre-emulsified shell monomer within 2 hours after an interval of 20 minutes. After adding all the monomers, add 4 parts of 10% aqueous initiator solution, raise the temperature to 85...

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Abstract

The invention relates to a high-sealing polyacrylic ester dispersoid and a preparation method thereof; a multi-element emulsifier system which consists of an anionic emulsifier and a compound non-ionic emulsifier is adopted for controlling the charging process and components of the emulsifier in different polymerization periods, and the room-temperature self-crosslinking high-sealing polyacrylic ester dispersoid is prepared by a semi-continuous seeding emulsion polymerization process. The dispersoid has small particle size, good electrolyte-resistance (calcium ion) stability and high tolerance to various film forming accessory ingredients (various organic solvents with high boiling point). The dispersoid is used as seal coat of water-based wood coating and has good sealing performance to various woods; harmful volatile organic compounds (VOC) such as formaldehyde, and the like sealed against escaping from plates to pollute indoor environment, and the colored compounds such as turpentine, pine oil and tannin and the like are sealed against dissolving out of the plates to pollute pure top coating and white top coating of a water-based wooden ware; and in addition, the dispersoid can be used in water-based leather finishing agents.

Description

technical field [0001] The invention relates to a highly closed polyacrylate dispersion and a preparation method thereof. [0002] The invention also relates to the application of the high sealing polyacrylate dispersion prepared by the method in the preparation of water-based wood coatings. Background technique [0003] With the continuous enhancement of people's environmental and health awareness, water-based wood coatings have been paid more and more attention. Existing water-based wood coatings include resins such as polyacrylate dispersions, polyurethane aqueous dispersions, and polyurethane acrylic dispersions. Among them, polyacrylate dispersions have the advantages of high hardness, good weather resistance and low cost, but they have hot stickiness, cold brittleness, Disadvantages such as poor solvent resistance and water resistance. [0004] Room temperature self-crosslinking modification can overcome the above shortcomings, including based on Michael reaction, po...

Claims

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Application Information

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IPC IPC(8): C08F220/10C08F220/04C08F212/00C08F2/26C08F2/30C09D133/02C09D133/04C09D125/00
Inventor 瞿金清黎永津黄洪陈焕钦
Owner SOUTH CHINA UNIV OF TECH
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