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Dichloroethylene-acrylate copolymer emulsion and preparation method thereof

A vinylidene chloride and acrylate technology, applied in the field of emulsion preparation and metal anticorrosion, can solve the problems of poor salt spray resistance, single application of coatings, poor heat resistance, etc., to improve adhesion, reduce formaldehyde content, and improve comprehensive performance. Effect

Inactive Publication Date: 2020-06-12
泰安聚仁新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In order to overcome the deficiencies of the prior art, the present invention provides a vinylidene chloride-acrylate copolymer emulsion and its preparation method, which overcomes the shortcomings of the prior art such as poor heat resistance and poor salt spray resistance, and uses a new redox reaction system , by adding functional monomers that can form chemical bonds with metals, a high-performance anti-corrosion emulsion with high molecular weight, good film-forming properties, good adhesion, and excellent salt spray resistance can be obtained. The optimized component distribution ratio and preparation scheme greatly reduces the production cost of coatings and solves the defect of single application of existing coatings

Method used

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  • Dichloroethylene-acrylate copolymer emulsion and preparation method thereof
  • Dichloroethylene-acrylate copolymer emulsion and preparation method thereof
  • Dichloroethylene-acrylate copolymer emulsion and preparation method thereof

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preparation example Construction

[0074] The preparation method of ethylene dichloride-acrylic acid ester copolymerization emulsion, comprises the steps:

[0075] Step 1. Preparation of pre-emulsion: Stir reactive anionic emulsifier, nonionic emulsifier, dichloroethylene, A-type reactive monomer, B-type reactive monomer, C-type reactive monomer, and deionized water at room temperature at high speed 0.5 hour, prepare pre-emulsion;

[0076] Step 2. Preparation of seed emulsion: In a reactor, stir, dissolve and mix deionized water and reaction stabilizer, pass nitrogen through the dissolved mixture to remove oxygen, then heat up the mixed liquid to 55°C, add value in the pre-emulsion prepared in step 1 of 5-10%, to obtain the seed emulsion; then add 30% oxidizing agent solution, 30% reducing agent solution and all accelerators in sequence;

[0077] Step 3, emulsion dropwise polymerization: After the seed emulsion reaction system obtained in step 2 turns blue, add the remaining pre-emulsion and the remaining redo...

Embodiment 1

[0081] The preparation method of ethylene dichloride-acrylic acid ester copolymerization emulsion, comprises the steps:

[0082] Dissolve 0.5g of α-allyl alkylphenol polyoxyethylene ether ammonium sulfate and 1.0g of isomeric C12-C13 alcohol polyoxyethylene ether in 45g of deionized water, and add 1.0g of 2-acrylamide under the condition that the system temperature is <30°C -2-Methylpropanesulfonic acid, 2.0g methacrylic acid, 7.3g methyl methacrylate, 13.3g isooctyl acrylate, 76.4g 1,1-dichloroethylene, emulsified with high-speed stirring to obtain a pre-emulsion;

[0083] Add 40g of deionized water and 0.005g of EDTA into the reactor, vacuumize, and fill with nitrogen three times, take 7.25g of the pre-emulsion and pump it into the reactor, raise the temperature to 50°C, add 0.0003g of ferrous sulfate heptahydrate, 0.03 g tert-butyl hydroperoxide, 0.03g ascorbic acid reducing agent, react for 15-30min, and the reaction temperature rises to 55°C;

[0084] After the seeds hav...

Embodiment 2

[0099] The preparation method of ethylene dichloride-acrylic acid ester copolymerization emulsion, comprises the following steps:

[0100] Dissolve 0.5g of long-chain alkyl alcohol polyoxyethylene ether methacrylate and 1.0g of isomeric C12-C13 alcohol polyoxyethylene ether in 45g of deionized water, and add 1.0g of 2-acrylamide when the system temperature is <30°C - 2-methylpropanesulfonic acid, 2.0g methacrylic acid, 13.3g methyl methacrylate, 13.7g isooctyl acrylate, 70g 1,1-dichloroethylene, emulsified with high-speed stirring to obtain a pre-emulsion.

[0101] Add 40g of deionized water and 0.005g of EDTA into the reactor, vacuumize, and fill with nitrogen three times, take 7.25g of the pre-emulsion and pump it into the reactor, raise the temperature to 50°C, add 0.0003g of ferrous sulfate heptahydrate, 0.03 g tert-butyl hydroperoxide, 0.03 g ascorbic acid reducing agent, react for 15-30 min, and the reaction temperature rises to 55°C.

[0102] After the seeds have been ...

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Abstract

The invention relates to a dichloroethylene-acrylate copolymer emulsion and a preparation method thereof. The dichloroethylene-acrylate copolymer emulsion comprises 30-35% of dichloroethylene, 5-10% of an A-type reaction monomer, 0.5-2% of a B-type reaction monomer, 0.5-1% of a C-type reaction monomer, 0.001-0.01% of a reaction stabilizer, 0.5-1% of a reactive anionic emulsifier, 0.5-1% of a nonionic emulsifier, 0.00002% of an accelerant, 45-55% of deionized water and 0.05-0.3% of a redox initiator. Through the processes of pre-emulsion preparation, seed emulsion preparation, emulsion drop-by-drop-adding polymerization and curing, the defects of a conventional emulsifier are overcome, and the water resistance, the adhesive force and the salt spray resistance of a paint film are improved; and the environment-friendly emulsion with high molecular weight, paint film yellowing resistance, paint film strength and toughness is obtained by utilizing a redox reaction and adopting a formaldehyde-free reducing agent. The preparation system provided by the invention belongs to a strong acid type emulsion, can react with metal substrates such as a steel plate and the like, is beneficial to demulsification and base material combination of the emulsion in the film forming process, and further improves the compactness, water resistance and chemical resistance of the film.

Description

technical field [0001] The invention relates to the technical field of emulsion preparation for metal coatings, in particular to vinylidene chloride-acrylate copolymer emulsion and a preparation method thereof, which are mainly used in metal anticorrosion fields such as locomotives, steel structures, and automobile chassis. Background technique [0002] Existing emulsions for metal anti-corrosion coatings often use water-based one-component chlorine partial emulsions, which have disadvantages such as poor heat resistance, poor salt spray resistance, and poor adhesion to metal substrates; [0003] Existing conventional water-based one-component chlorine partial emulsions all use a thermally induced reaction system, and the ratio of effective substances in the formula is unreasonable, such as the selection and content ratio of dichloroethylene is unscientific, and the molecular weight of the obtained film is low , resulting in poor barrier performance of the paint film in the ...

Claims

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Application Information

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IPC IPC(8): C08F214/08C08F220/58C08F220/06C08F220/14C08F220/18C08F230/02C08F220/32C08F220/60C08F2/24C08F2/26C08F2/30C08F4/40
CPCC08F2/24C08F2/26C08F2/30C08F4/40C08F214/08C08F220/06C08F220/14C08F230/02
Inventor 郭仁星郑涛李岗
Owner 泰安聚仁新材料有限公司
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