High-adhesion water-based vinylidene chloride copolymer emulsion for metal surface and preparation method thereof

A technology of vinylidene chloride and high adhesion, applied in the direction of coating, etc., can solve the problems of restricting the application of vinylidene chloride resin, poor adhesion of metal substrates, and decreased coating adhesion, so as to improve the barrier performance of resin, Improves resin adhesion and facilitates migration

Active Publication Date: 2020-09-25
TIANJIN CHENGJIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Water-based vinylidene chloride coatings can be prepared by dispersing vinylidene chloride copolymer emulsion with functional additives, pigments and fillers. This type of coating has good 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 the application of vinylidene chloride resin in the field of metal anti-corrosion coatings
[0003] Copolymerization of vinylidene chloride with acrylate and ot

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0018] The preparation method of the high-adhesion aqueous vinylidene chloride copolymer emulsion for metal surfaces of the present invention includes the following steps:

[0019] (1) Add vinylidene chloride, butyl acrylate, emulsifier and water into the pre-emulsification tank, stir and emulsify under ice bath conditions to obtain a pre-emulsion, wherein the mass percentage of vinylidene chloride and butyl acrylate is (75 ~85)%: (15-25)%, the emulsifier is sodium dodecyl sulfonate and alkyl glycoside, the amount is 1.0% to 2.5% of the total mass of vinylidene chloride and butyl acrylate, and the amount of water is partial 75% to 115% of the total mass of vinyl chloride and butyl acrylate;

[0020] (2) Add 20% of the mass of the pre-emulsion to the reactor, then add the molecular weight regulator and functional monomer, the reaction system is evacuated and filled with nitrogen, repeated three times, the reaction system is heated to 35°C, and the initiator persulfuric acid is added...

Example Embodiment

[0032] Example 1

[0033] Dissolve 0.95g sodium dodecyl sulfonate and 1.00g alkyl glycoside in 100mL deionized water, stir until the emulsifier is completely dissolved, add 78.00g vinylidene chloride and 22.00g butyl acrylate under ice bath conditions, and emulsify with high speed stirring For 45 minutes, a pre-emulsion was obtained.

[0034] Secondly, 40.39g of the above-mentioned pre-emulsion was transferred to the reactor, and then 0.18g 2-mercaptobutyric acid, 1.26g methacrylic acid, 1.30g sodium 4-styrene sulfonate and 1.42g 2-hydroxyethyl methyl were added. Acrylate phosphate, fill the reactor with inert gas to eliminate oxygen (three times), increase the temperature to 35℃, add 0.25g potassium persulfate dissolved in 1mL water and 0.20g sodium thiosulfate dissolved in 1mL water, and polymerize at constant temperature For 3 hours, add the remaining pre-emulsified liquid at once, react at constant temperature for 7 hours, cool down, and filter out to obtain a vinylidene chlor...

Example Embodiment

[0040] Example 2

[0041] Dissolve 0.90g sodium dodecyl sulfonate and 0.95g alkyl glycoside in 90mL deionized water, stir until the emulsifier is completely dissolved, add 80.00g vinylidene chloride and 20.00g butyl acrylate under ice bath conditions, and emulsify with high speed stirring For 45 minutes, a pre-emulsion was obtained.

[0042] Secondly, 38.37g of the above-mentioned pre-emulsified liquid was transferred to the reactor, and then 0.20g ethyl 3-mercaptobutyrate, 1.45g methacrylic acid, 1.50g sodium 4-styrene sulfonate and 2.00g 2-hydroxyethyl methyl were added. Acrylate phosphate, fill the reactor with inert gas to eliminate oxygen, raise the temperature to 35°C, add 0.20g potassium persulfate dissolved in 1mL water and 0.18g sodium thiosulfate dissolved in 1mL water, polymerize at constant temperature for 4 hours, Add the remaining pre-emulsion at one time, react at a constant temperature for 6 hours, cool down, and filter to obtain a vinylidene chloride copolymer emu...

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Abstract

The invention discloses a high-adhesion water-based vinylidene chloride copolymer emulsion for a metal surface and a preparation method of the high-adhesion water-based vinylidene chloride copolymer emulsion. The preparation method comprises the following steps of: fully stirring vinylidene chloride, acrylate, an emulsifier and water to form a pre-emulsified liquid, adding part of the pre-emulsified liquid and a functional monomer into a reactor, initiating a polymerization reaction by adopting a redox system, reacting at constant temperature for a period of time, adding the residual pre-emulsified liquid into the reactor at one time, and continuously reacting to obtain the emulsion resin. The emulsion disclosed by the invention is good in storage stability and uniform in particle size, and the resin is extremely strong in adhesive force on a metal surface, has relatively good barrier property and corrosion resistance, and can be used as matrix resin for a metal substrate anticorrosivecoating.

Description

technical field [0001] The invention relates to a copolymerized emulsion paint, in particular to a water-based vinylidene chloride copolymerized emulsion with high adhesion for metal surfaces and a preparation method thereof. Background technique [0002] The copolymer emulsion synthesized with vinylidene chloride (VDC) as the main monomer is a coating matrix resin with excellent barrier properties, and has formed a series of commercial products at home and abroad. Water-based vinylidene chloride coatings can be prepared by dispersing vinylidene chloride copolymer emulsion with functional additives, pigments and fillers. This type of coating has good properties such as moisture resistance, abrasion resistance, oil resistance, chemical corrosion resistance and flame retardancy. The adhesion on the metal substrate is poor, and the paint film is easy to fall off in a large area, which seriously restricts the application of vinylidene chloride resin in the field of metal anti-co...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F220/18C08F220/06C08F212/14C08F230/02C08F2/26C08F2/30C08F2/38C09D127/08
CPCC08F214/08C08F2/26C08F2/30C08F2/38C09D127/08C08F220/1804C08F220/06C08F212/30C08F230/02
Inventor 王滨周小琴陈宇朱森
Owner TIANJIN CHENGJIAN UNIV
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