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Method for preparing high-solid-content modified polyvinyl acetate

A technology of polyvinyl acetate and vinyl acetate, which is applied in the field of preparation of high-solid-content modified polyvinyl acetate, can solve problems such as poor bonding performance, drying film-forming time and water resistance that cannot meet social requirements, etc. Achieve the effects of good performance, fast film forming speed and good water resistance

Active Publication Date: 2015-09-23
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the development of social economy, people's requirements for polyvinyl acetate are gradually increasing. The usual polyvinyl acetate has freeze-thaw resistance, storage stability, drying film-forming time and water resistance. The molecular weight distribution of the polymer is quite wide, and the bonding performance for plastic and metal materials is poor, which needs further research and improvement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The preparation method of high solid content modified polyvinyl acetate of the present invention comprises the following steps:

[0023] S1. After mixing 25 parts by weight of polyvinyl alcohol aqueous solution with a mass fraction of 10 wt%, 3 parts of emulsifier, 20 parts of vinyl acetate, 5 parts of acrylic acid, and 0.5 part of isooctyl acrylate, stir and heat up to 60 ° C. Emulsify for 20min to obtain a pre-emulsified solution;

[0024] S2. Add 1.5 parts of initiator aqueous solution with a mass fraction of 10wt% dropwise in the pre-emulsified solution, stir and heat up to 75°C, react for 0.5h, add dropwise 80 parts of vinyl acetate, 2.5 parts of acrylic acid, and 5 parts of isooctyl acrylate The mixed solution of composition, obtains intermediate solution; Wherein, in the process of dropwise adding mixed solution, every 20min dripping 0.1 part mass fraction is the initiator aqueous solution of 10wt%;

[0025] S3, adding 10 parts of polyvinyl alcohol aqueous solut...

Embodiment 2

[0028] The preparation method of high solid content modified polyvinyl acetate of the present invention comprises the following steps:

[0029] S1. After mixing 50 parts by weight of 3wt% polyvinyl alcohol aqueous solution, 1 part of emulsifier, 25 parts of vinyl acetate, 1 part of acrylic acid, and 2 parts of isooctyl acrylate, stir and heat up to 50 ° C for pre-emulsification 50min obtains pre-emulsified solution;

[0030] S2. Add dropwise 4 parts of initiator aqueous solution with a mass fraction of 5wt% in the pre-emulsified solution, stir and heat up to 65°C, react for 2 hours, add dropwise a composition consisting of 50 parts of vinyl acetate, 12 parts of acrylic acid, and 1 part of isooctyl acrylate The mixed solution, obtains intermediate solution; Wherein, in the process of dripping mixed solution, dropping time is 5h, and every 8min dripping 0.15 parts mass fraction is the initiator aqueous solution of 5wt%;

[0031] S3. Add 15 parts of polyvinyl alcohol aqueous sol...

Embodiment 3

[0035] The preparation method of high solid content modified polyvinyl acetate of the present invention comprises the following steps:

[0036] S1. After mixing 36 parts by weight of polyvinyl alcohol aqueous solution with a mass fraction of 5wt%, 1.56 parts of emulsifier, 22 parts of vinyl acetate, 2 parts of acrylic acid, and 1 part of isooctyl acrylate, stir and heat up to 53 ° C. Emulsify for 30min to obtain a pre-emulsified solution;

[0037] S2. Add 2 parts of an aqueous initiator solution with a mass fraction of 7wt% dropwise in the pre-emulsified solution, stir and heat up to 69°C, react for 1 hour, add dropwise a composition consisting of 63 parts of vinyl acetate, 9 parts of acrylic acid, and 3 parts of isooctyl acrylate The mixed solution, obtains the intermediate solution; Wherein, in the process of dripping the mixed solution, the dropping time is 5.7h, and every 10min dripping 0.12 parts of mass fraction is the initiator aqueous solution of 7wt%;

[0038] S3. Ad...

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PUM

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Abstract

The invention discloses a method for preparing high-solid-content modified polyvinyl acetate. The method comprises the steps of mixing, stirring, heating and pre-emulsifying a polyving akohol aqueous solution, emulsifiers, vinyl acetate, crylic acid and 2-ethylhexyl acrylate to obtain a pre-emulsification solution; adding an initiator aqueous solution dropwise for stirring reaction, and adding a vinyl acetate, crylic acid and 2-ethylhexyl acrylate mixing solution dropwise to obtain a midst solution, wherein during mixing solution adding, the initiator aqueous solution is added dropwise every other 8-20 min; adding a polyving akohol aqueous solution to the midst solution for stirring reaction, adding the initiator aqueous solution dropwise for stirring reaction, and cooling the solution naturally to obtain the high-solid-content modified polyvinyl acetate. The modified polyvinyl acetate prepared with method is high in solid content, high in water resistance, high in film formation speed, high in using performance, totally free of toxic organic matter such as formaldehyde, and capable of meeting the requirement for environment friendliness.

Description

technical field [0001] The invention relates to the technical field of polyvinyl acetate, in particular to a preparation method of high solid content modified polyvinyl acetate. Background technique [0002] High solid content emulsion is not only an environmentally friendly product, but also has faster drying speed than ordinary emulsion, high equipment utilization rate, low energy consumption per unit product, and low transportation cost. Therefore, it has become an important direction for the research and development of polymer emulsions. The 50% emulsion is a high solids emulsion. [0003] Polyvinyl acetate emulsion products are cheap, environmentally friendly, and have excellent adhesive properties, and have been widely used in various industries. With the development of social economy, people's requirements for polyvinyl acetate are gradually increasing. The usual polyvinyl acetate has freeze-thaw resistance, storage stability, drying film-forming time and water resis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F218/08C08F220/06C08F220/18C08F2/24
Inventor 胡劲松
Owner ANHUI UNIV OF SCI & TECH