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Water-based vinylidene chloride copolymer resin and preparation method thereof

A vinylidene chloride copolymer resin and vinylidene chloride technology, which is applied in the field of water-based vinylidene chloride copolymer resin and its preparation, can solve the problems of affecting the compactness of the coating, peeling off of the paint film, and poor compatibility, so as to improve the adhesion and The effect of corrosion resistance

Inactive Publication Date: 2020-08-11
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Waterborne vinylidene chloride coatings can be prepared by dispersing vinylidene chloride latex with functional additives, pigments and fillers. This type of coating has excellent properties such as moisture resistance, abrasion resistance, oil resistance, chemical corrosion resistance and flame retardancy. The adhesion on the metal substrate is not good, and the paint film is easy to fall off in a large area, which seriously restricts its application in the field of metal anti-corrosion coatings
[0003] Copolymerization of vinylidene chloride with acrylate and other monomers to prepare vinylidene chloride copolymer latex can improve the adhesion of the resin on the metal surface, but the introduction of comonomer will affect the compactness of the coating, resulting in a decrease in barrier properties
Adding adhesion-enhancing resins to water-based vinylidene chloride coatings can improve the adhesion of coatings on metal surfaces to a certain extent, but vinylidene chloride resins have strong crystallinity, poor compatibility with ordinary adhesion-enhancing resins, and film formation During the process, the latex is easy to separate from the external adhesion resin, resulting in a decrease in the adhesion of the coating

Method used

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  • Water-based vinylidene chloride copolymer resin and preparation method thereof
  • Water-based vinylidene chloride copolymer resin and preparation method thereof

Examples

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preparation example Construction

[0023] A kind of preparation method of aqueous vinylidene chloride copolymer resin of the present invention, comprises the following steps:

[0024] (1) Add vinylidene chloride, acrylate, functional monomer, emulsifier, molecular weight modifier and water into the reactor, stir under ice bath for pre-emulsification, and obtain pre-emulsion, wherein the emulsifier is dodecyl Sodium sulfonate and alkyl glucoside, the consumption of emulsifier is 1%~3% of the total mass of vinylidene chloride, acrylate and functional monomer, wherein the mass percentage example of sodium dodecyl sulfonate and alkyl glycoside is ( 45~50)%: (50~55)%;

[0025] (2) Under the protection of an inert gas, the temperature of the reaction system was raised to 36°C, and the initiator sodium bisulfite and ammonium persulfate aqueous solutions were added respectively. The initiator was 0.1-0.5% of the total mass of vinylidene chloride, acrylate and functional monomers %, constant temperature reaction to pre...

Embodiment 1

[0042] Dissolve 1.00g sodium dodecylsulfonate and 1.15g alkyl glucoside in 110g deionized water, stir until the emulsifier is completely dissolved, add 20.00g butyl acrylate, 70.00g vinylidene chloride, 3.10g acrylic acid under ice bath conditions , 2.50g 2-hydroxyethyl methacrylate phosphate, 0.20g 2-mercaptobutyric acid, emulsified at high speed for 30 minutes to obtain a pre-emulsion.

[0043] Transfer the pre-emulsion to the reactor, vacuumize and fill with nitrogen three times, heat up to 36°C, add 0.18g ammonium persulfate dissolved in 1mL water and 0.12g sodium bisulfite dissolved in 1mL water, react at constant temperature for 4 hours, heat up To 45°C, continue to react for 2 hours, cool down, filter and discharge to obtain vinylidene chloride copolymer resin: solid content is 47%, viscosity at 25°C is 250mPa·s, pH is 1.8.

[0044] Use the vinylidene chloride copolymer resin in Example 1 to prepare water-based vinylidene chloride coating according to the formula in Tab...

Embodiment 2

[0049] Dissolve 1.15g sodium dodecylsulfonate and 1.25g alkyl glycoside in 95g deionized water, stir until the emulsifier is completely dissolved, add 7.00g butyl acrylate, 13g isooctyl acrylate, 70.00g partial Vinyl chloride, 3.10 g of acrylic acid, 2.80 g of 2-hydroxyethyl methacrylate phosphate, and 0.40 g of ethyl 3-mercaptobutyrate were emulsified with high-speed stirring for 30 minutes to obtain a pre-emulsion.

[0050] Transfer the pre-emulsion to the reactor, vacuumize and fill with nitrogen three times, heat up to 36°C, add 0.18g ammonium persulfate dissolved in 1mL water and 0.12g sodium bisulfite dissolved in 1mL water, react at constant temperature for 6 hours, and heat up To 45°C, continue to react for 2 hours, cool down, filter and discharge to obtain adhesion-enhancing resin: solid content is 51%, viscosity at 25°C is 320mPa·s, pH is 2.2.

[0051] With the vinylidene chloride copolymer resin in embodiment 2, according to embodiment 1 scheme system paint and coat...

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Abstract

The invention discloses water-based vinylidene chloride copolymer resin and a preparation method thereof. The preparation method comprises the following steps: adding vinylidene chloride, acrylate, afunctional monomer, an emulsifier, a molecular weight regulator and water into a reactor, carrying out uniform stirring to obtain a pre-emulsion, then adding initiators, namely ammonium persulfate andsodium hydrogen sulfite, and initiating a polymerization reaction at constant temperature to obtain the vinylidene chloride copolymer resin. The resin prepared according to such a scheme of the invention is in an emulsion state, has good water dispersibility, can be directly added as functional resin into a water-based vinylidene chloride coating, can effectively improve the adhesive force of thevinylidene chloride coating on the metal surface, and does not influence the barrier property of the coating.

Description

technical field [0001] The invention relates to coating resins, in particular to a water-based vinylidene chloride copolymer resin and a preparation method thereof. Background technique [0002] Vinylidene chloride (VDC)-synthesized latex is a coating resin material with excellent barrier properties. It has formed a series of products at home and abroad and has been widely used. Waterborne vinylidene chloride coatings can be prepared by dispersing vinylidene chloride latex with functional additives, pigments and fillers. This type of coating has excellent properties such as moisture resistance, abrasion resistance, oil resistance, chemical corrosion resistance and flame retardancy. The adhesion on the metal substrate is not good, and the paint film is easy to fall off in a large area, which seriously restricts its application in the field of metal anti-corrosion coatings. [0003] Copolymerization of vinylidene chloride and acrylate monomers to prepare vinylidene chloride c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F214/08C08F220/18C08F220/06C08F230/02C08F220/20C09D127/08C09D5/08C09D7/65
CPCC08F214/08C08L2205/025C09D5/08C09D127/08C09D7/65C08F220/1804C08F220/06C08F230/02C08F220/1808C08F220/20C08L27/08
Inventor 王滨林俊铭陈宇刘丽娟
Owner TIANJIN CHENGJIAN UNIV
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