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Method for preparing waterborne anticorrosion coating resin vinylidene chloride-acrylate

A technology of vinylidene chloride and acrylate, which is applied in the field of coating science, can solve problems such as adhesion, salt spray resistance, poor emulsion stability, and easy emulsion breakage, etc., to achieve good emulsification and improve Good film-forming property and stability

Inactive Publication Date: 2011-11-23
TIANJIN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few research reports on water-based vinylidene chloride-acrylate emulsion in China, especially the products that can be practically applied have not yet entered the market. The main reason is that the stability of the emulsion after polymerization is not good, and the emulsion is easy to break after long-term storage Milky, coalescing, and the adhesion and salt spray resistance of the film can not meet the index requirements of the coating

Method used

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  • Method for preparing waterborne anticorrosion coating resin vinylidene chloride-acrylate
  • Method for preparing waterborne anticorrosion coating resin vinylidene chloride-acrylate
  • Method for preparing waterborne anticorrosion coating resin vinylidene chloride-acrylate

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Dissolve 2.6g of the asymmetric anion-nonionic Gemini surfactant synthesized as in (3) in 276g of deionized water. After the emulsifier is completely dissolved, add 28.8g of butyl acrylate and 16.8g of methyl methacrylate under ice bath conditions. Ester, 278.4g of vinylidene chloride, emulsified at high speed under ice bath for 1 hour to obtain pre-emulsion.

[0036] Add 242g of pre-emulsion into the reactor, vacuumize and fill with nitrogen three times, raise the temperature to 78°C, add 1.95g of azobisisobutyronitrile dissolved in 5mL of ethanol, keep the temperature for 15-30min, and start adding the remaining pre-emulsion dropwise. After dripping the emulsion in half an hour, react at a constant temperature for 5 hours to obtain a vinylidene chloride-acrylate emulsion: the solid content is about 55%. The emulsion has excellent storage stability, high coating film hardness, good water resistance, chemical resistance and salt spray resistance, and can be applied to w...

Embodiment 2

[0041]Dissolve 2.6g of the polyoxyethylene ether synthesized as in (2) as the linker Gemini surfactant in 276g of deionized water. After the emulsifier is completely dissolved, add 31.0g of butyl acrylate and 14.6g of methacrylic acid under ice bath conditions. Methyl ester and 278.4g of vinylidene chloride were emulsified with high-speed stirring under an ice bath for 1 hour to obtain a pre-emulsion.

[0042] Add 302g of pre-emulsion into the reactor, vacuumize and fill with nitrogen three times, heat up to 75°C, add 1.95g of azobisisobutyronitrile dissolved in 5mL of ethanol, keep the temperature for 15-30min, and start adding the remaining pre-emulsion dropwise. After dripping the emulsion in half an hour, react at a constant temperature for 5 hours to obtain a vinylidene chloride-acrylate emulsion: the solid content is about 55%. The emulsion has excellent storage stability, high coating film hardness, good water resistance, chemical resistance and salt spray resistance, a...

Embodiment 3

[0044] Dissolve 2.6g of the polyoxyethylene ether synthesized as in (2) as the linker Gemini surfactant in 276g of deionized water. After the emulsifier is completely dissolved, add 27.0g of butyl acrylate and 15.0g of methacrylic acid under ice bath conditions. Methyl ester and 282.0 g of vinylidene chloride were emulsified with high-speed stirring under an ice bath for 1 hour to obtain a pre-emulsion.

[0045] Add 280g of pre-emulsion into the reactor, vacuumize and fill with nitrogen three times, heat up to 75°C, add 1.95g of azobisisobutyronitrile dissolved in 5mL of ethanol, keep the temperature constant for 15-30min, and start adding the remaining pre-emulsion dropwise. After dripping the emulsion in half an hour, react at a constant temperature for 5 hours to obtain a vinylidene chloride-acrylate emulsion: the solid content is about 55%. The emulsion has excellent storage stability, high coating film hardness, good water resistance, chemical resistance and salt spray re...

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Abstract

The invention discloses a method for preparing waterborne anticorrosion coating resin vinylidene chloride-acrylate. In the method, vinylidene chloride, acrylate and different compounded emulsifiers are pre-emulsified, and azodiisobutyronitrile is used for initiating polymerization reaction. The method comprises the following steps of: adding partial pre-emulsion into a reactor; heating to temperature higher than the initiation temperature of an initiator, adding the initiator, and performing polymerization reaction at constant temperature to obtain seeded emulsion; and dripping the rest pre-emulsion into the reactor and continuously performing the reaction at constant temperature. The emulsion has high stability, uniform particle size, high resin adhesion and high film and anticorrosion properties, is environment-friendly and nontoxic, and can provide good corrosion protection for carbon steel matrixes.

Description

technical field [0001] The invention relates to the field of coating science and technology, in particular to a copolymer emulsion and a preparation method thereof. Background technique [0002] Copolymer latex synthesized by vinylidene chloride (VDC) is a coating material with excellent gas barrier and moisture barrier properties. It has formed a series of products abroad and has been widely used. Domestic coating grade VDC copolymer latex is under development. Coatings formulated with vinylidene chloride copolymer resin water emulsion as the main film-forming substance are called vinylidene chloride copolymer resin water emulsion paints or vinylidene chloride copolymer resin emulsion paints. Water-emulsion paint is usually called latex paint, which is a mixture of an aqueous dispersion of synthetic resin particles (water emulsion) and an aqueous dispersion of pigment particles (pigment slurry). [0003] The advantages of water-emulsion coatings are no organic solvents, no...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F220/18C08F220/14C08F2/26C08F2/30C09D127/08C09D5/08
Inventor 陈宇崔文柱程发贾艳华刘训恿赵举付策孙希鹏
Owner TIANJIN UNIV
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