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Soap-free polymerized acrylic acid emulsion and preparation method thereof

A technology of polymerizing acrylic acid and isooctyl acrylate, applied in the direction of coating, can solve the problems of expensive emulsifier, increased product cost, unstable emulsion, etc., and achieve excellent weathering resistance, water whitening resistance, and excellent stain resistance. sexual effect

Active Publication Date: 2016-08-17
山东聚东新材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large amount of emulsifier contained in the traditional emulsion polymerization, in the film and coating, the emulsifier is desorbed from the surface of the latex particles, resulting in unstable emulsion, which greatly limits its application
In addition, emulsifiers are usually expensive, adding emulsifiers will also increase the cost of their products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The polymerization formula is: methyl methacrylate 17 (weight percent, the same below); isooctyl acrylate 19, methacrylic acid 0.7; styrene 8; acrylamide 0.5; ammonium persulfate 0.1; sodium alkylamide ethylene sulfonate 0.8 , Ammonia is a pH adjuster of 0.2; water is 53.7.

[0019] Polymerization process:

[0020] According to the above formula, weigh the monomer phase, emulsifier 0.48, and deionized water 0.9 in the emulsification tank, stir, and emulsify for 30-60 minutes to prepare the pre-emulsified monomer liquid;

[0021] b. Add 50.8 g of deionized water into the reactor, stir, then add 0.32 emulsifier into the reactor, stir and raise the temperature to 85°C. Evacuate to remove oxygen, and then break the vacuum with nitrogen.

[0022] c. Add 4-8% of the pre-emulsion into the reaction kettle. Stir and heat up to 80°C, add initiator, and carry out seed polymerization (initial reaction) for 25 minutes.

[0023] d. Add the remaining pre-emulsion dropwise at 84°C ...

Embodiment 2

[0025] The polymerization formula is: methyl methacrylate 20 (weight percent, the same below); isooctyl acrylate 18, methacrylic acid 0.9; styrene 10; acrylamide 0.53; potassium persulfate 0.2; sodium alkylamide ethylene sulfonate 0.9 , Ammonia is a pH regulator of 0.3; water is 49.17.

[0026] Polymerization process:

[0027] Weigh the monomer, emulsifier 0.55, and deionized water 0.9 in the emulsification tank according to the formula, stir and emulsify for 30-60 minutes to prepare the pre-emulsified monomer liquid;

[0028] b. Add 39.17% of deionized water into the reaction kettle, stir, then add 0.35% of emulsifier into the reaction kettle, stir and raise the temperature to 85°C. Evacuate to remove oxygen, and then break the vacuum with nitrogen.

[0029] c. Add 5% of the pre-emulsion to the reaction kettle. Stir and heat up to 76°C, add initiator, and carry out seed polymerization (initial reaction) for 25 minutes.

[0030] d. Add the remaining pre-emulsion dropwise a...

Embodiment 3

[0032] The polymerization formula is: methyl methacrylate 19 (weight percent, the same below); isooctyl acrylate 22.6, methacrylic acid 1; styrene 5; acrylamide 0.15; ammonium persulfate 0.1; , ammonia water is pH adjuster 0.2; defoamer 0.08; water 51.07.

[0033] Polymerization process:

[0034] According to the above formula, weigh the monomer phase, emulsifier 0.48, and deionized water 1 in the emulsification tank, stir, and emulsify for 30 to 60 minutes to prepare the pre-emulsified monomer liquid;

[0035] b. Add 50.07 deionized water into the reaction kettle, stir, then add 0.32 emulsifier into the reaction kettle, stir and raise the temperature to 85°C. Evacuate to remove oxygen, and then break the vacuum with nitrogen.

[0036] c. Add 4-8% of the pre-emulsion into the reaction kettle. Stir and heat up to 80°C, add initiator, and carry out seed polymerization (initial reaction) for 25 minutes.

[0037] d. Add the remaining pre-emulsion dropwise at 84°C for 3 hours. ...

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PUM

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Abstract

The invention discloses a soap-free polymerized acrylic acid emulsion and a preparation method thereof. Its raw materials contain 15-22% of methyl methacrylate, 16-21% of isooctyl acrylate, 0.6-1% of methacrylic acid, and 7-2% of styrene. 10%, acrylamide is 0.3-0.6% monomer, ammonium persulfate or potassium persulfate is 0.1-0.4% initiator, alkylamide vinyl sulfonate or sodium dodecylbenzene sulfonate is 0.4-1.2% Emulsifier, ammonia water is 0.2-0.4% of pH regulator, and water is 45-55%. Soap-free polymerized acrylic emulsion was prepared by pre-emulsification, seed polymerization and polymerization. The invention not only maintains the advantages of the traditional emulsion, but also has excellent water whitening resistance and excellent water resistance of the paint film. Excellent weather resistance, no yellowing. Fine particle size and high gloss, good color development. Excellent dry and wet adhesion; excellent resistance to weathering and salting-out. The paint film is tough and dense, with good hardness, excellent stain resistance and anti-adhesion. It lowers the product cost and has wide applicability, and is used to prepare high-performance flat to high-gloss coatings for external use.

Description

technical field [0001] The invention belongs to the technical field of polymer synthesis, and in particular relates to a soap-free polymerized acrylic acid emulsion and a preparation method thereof. Background technique [0002] At present, emulsifiers are added to the emulsion polymerization to stabilize the system and nucleate, but the inclusion of emulsifiers will affect the electrical properties, optical properties, surface properties and water resistance of the emulsion polymer. Due to the large amount of emulsifier contained in the traditional emulsion polymerization, in the film and coating, the emulsifier is desorbed from the surface of the latex particle, resulting in instability of the emulsion, which greatly limits its application. In addition, emulsifiers are usually expensive, and the addition of emulsifiers will also increase the cost of their products. Contents of the invention [0003] The purpose of the present invention is to solve the problems existing ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F220/18C08F212/08C08F220/06C08F220/56C08F2/26C09D133/12C09D133/08
Inventor 王福生郭方飞宋爱军
Owner 山东聚东新材料有限责任公司
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