Preparation method of vinyl acetate-acrylate copolymerization emulsion

A technology of acrylate and vinyl acetate, applied in the field of preparation of nano-vinyl acetate-acrylate copolymer emulsion, can solve the problems of poor dispersion stability, failure to achieve nanometerization, increase in particle size, etc., to improve water resistance and resin composition. The effect of membrane densification and pH stabilization

Inactive Publication Date: 2009-11-25
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, nanometerization has been realized in pure acrylate emulsions or other modified acrylate emulsions such as polyurethane-modified acrylate emulsions, and has been well applied. However, due to the special nature of vinyl acetate monomers, vinyl acetate and its copolymer emulsions Sex has not yet been nanosized
The main reasons are: First, compared with acrylate monomers, vinyl acetate monomers have a relatively large solubility in water, so the nucleation in the water phase during the polymerization process is one of the nucleation methods that cannot be ignored. In the seed emulsion polymerization method, after the seed polymerization process is completed, there will still be new nucleation with the addition of monomers. Because of the ex

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0040] Example 1:

[0041] The starting material of the preparation method of nano vinyl acetate-acrylate copolymer emulsion is composed of the following components

[0042] Vinyl acetate 25g

[0043] Butyl acrylate 6g

[0044] Methacrylic acid 1g

[0045] Methyl methacrylate 3g

[0046] Sodium lauryl sulfate 0.5g

[0047] Nonylphenol polyoxyethylene ether 0.2g

[0048] Sodium vinyl sulfonate 0.3g

[0049] Dodecanethiol 0.1g

[0050] Potassium persulfate 0.22g

[0051] Triethylamine 1g

[0052] Water 65g

[0053] Sodium bicarbonate 0.2g

[0054] Butanol 0.05g

[0055]The preparation method is as follows: combine 55 g of water, 0.5 g of sodium lauryl sulfate, 0.2 g of nonyl phenol polyoxyethylene ether, 0.3 g of sodium vinyl sulfonate, 0.2 g of sodium bicarbonate, and 0.05 g of the above starting materials. Add butanol to the reactor, stir for 30 minutes under nitrogen protection, then add 1 / 3 of the mixed monomer mixed with 0.1g of dodecanethiol and 1 / 3 of potassium persulfate dis...

Example Embodiment

[0061] Example 2:

[0062] The starting material of the preparation method of nano vinyl acetate-acrylate copolymer emulsion is composed of the following components

[0063] Vinyl acetate 35g

[0064] Ethyl acrylate 2g

[0065] Methacrylic acid 1.5g

[0066] Methyl methacrylate 1.5g

[0067] Sodium dodecylbenzene sulfonate 1g

[0068] Polyoxyethylene octylphenol ether 2g

[0069] Alkylphenol ether ammonium sulfate 1g

[0070] Butyl mercaptan 0.01g

[0071] Potassium persulfate-sodium bisulfite 0.22 / 0.05g

[0072] Ammonia 0.1g

[0073] Water 60g

[0074] Sodium bicarbonate 0.26g

[0075] Octanol 0.1g

[0076] The preparation method is as follows: 50g water, 1g sodium dodecylbenzene sulfonate, 2g octylphenol polyoxyethylene ether, 1g alkylphenol ether ammonium salt, 0.26g sodium bicarbonate, 0.1 Add g octanol to the reaction kettle, stir under nitrogen protection for 30 minutes, then add 1 / 3 of the mixed monomer mixed with 0.01 g of butyl mercaptan and potassium persulfate-sodium bi...

Example Embodiment

[0082] Example 3:

[0083] The starting material of the preparation method of nano vinyl acetate-acrylate copolymer emulsion is composed of the following components

[0084] Vinyl acetate 30g

[0085] Butyl acrylate 8g

[0086] Methacrylic acid 1g

[0087] Methyl methacrylate 2g

[0088] Ethyl acrylate 2g

[0089] Methyl acrylate 2g

[0090] Sodium lauryl sulfate 1.2g

[0091] Polyoxyethylene octylphenol ether 0.6g

[0092] Sodium vinyl sulfonate 0.4g

[0093] Methyl mercaptan butyrate 1.5g

[0094] Potassium persulfate 0.3g

[0095] Ammonia 1g

[0096] Water 55g

[0097] Sodium bicarbonate 0.25g

[0098] Hexanol 0.1g

[0099] The preparation method is as follows: mix 45g water, 1.2g sodium lauryl sulfate, 0.6g octylphenol polyoxyethylene ether, 0.4g sodium alkenyl sulfonate, 0.25g sodium bicarbonate, 0.1g Hexanol was added to the reaction kettle, stirred under nitrogen protection for 30 minutes, and then started to add dropwise mixed monomers mixed with 1.5 g methyl mercaptan but...

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Abstract

The invention discloses a preparation method of vinyl acetate-acrylate copolymerization emulsion, comprising the steps of adding 55-65 parts of water by weight, 0.01-4 parts of surfactant by weight, 0.5-2 parts of pH stabilizer by weight and 0.1-1 part of alkyl alcohol by weight into a reaction kettle with an agitator, a thermometer, a nitrogen tube and a reflux condenser, adding part of mixed monomers of mixed chain transfer agents, adequately emulsifying, raising temperature to a reaction temperature, adding part of initiators, reacting for 0.5 hour, and obtaining the seed emulsion when the emulsion has blue lights; dripping the rest mixed monomers into the reaction kettle with the seed emulsion, finishing dripping within 3 hours, synchronously supplementing the rest initiators, after finishing feeding, keeping the reaction temperature, reacting for 3 hours, raising temperature to 85 DEG C, continuously reacting for 0.5 hour so as to reduce the content of residual monomers, and then adding a neutralizing agent, adjusting the pH value of the emulsion to be neutral, cooling down and discharging material, and filtering to obtain the nanometer-sized emulsion. The obtained emulsion has a particle diameter smaller than 100nm and has excellent storage stability and other comprehensive performances.

Description

technical field [0001] The invention relates to a preparation method of nanometer vinyl acetate-acrylate copolymer emulsion, which belongs to the field of polymer synthesis. The copolymer emulsion is used in the fields of wood processing, fabric bonding, packaging materials and architectural decoration. technical background [0002] Vinyl acetate-acrylate copolymer emulsion is to use vinyl acetate and acrylate to copolymerize to improve the performance of the emulsion. The acrylate monomer can be selected according to the performance requirements. Usually, a certain amount of methacrylic acid is added as a functional monomer to improve the performance of the emulsion. Emulsion stability, paint film heat resistance, and the obtained copolymer emulsion. Because polyvinyl acetate and its copolymerized emulsion are water-dispersed, non-toxic, and environmentally friendly; they have the advantages of strong adhesion to porous materials such as wood, paper, cotton cloth, ceramics...

Claims

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Application Information

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IPC IPC(8): C08F218/08C08F220/14C08F220/18C08F2/26C08F2/30
Inventor 张军华杜海燕
Owner SICHUAN UNIV
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