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Production method of PVB resin

A production method and resin technology, applied in the direction of adhesives, etc., can solve the problems of consuming a lot of pure water to clean the mother liquor residue, and the environmental protection pressure of enterprises, and achieve the effects of good quality, increased output rate, and low haze

Active Publication Date: 2021-09-24
HUZHOU XINFU NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, because hydrochloric acid, butyraldehyde etc. are added in the PVB resin, cause it to consume a large amount of pure water to clean and just can reach product quality requirement under the washing condition in the existing technology kettle (because the washing method in the existing technology kettle can not reduce mother liquor residual , resulting in the need for multiple washings to ensure the quality), the basic ton consumption in the industry is at least 50 tons or more, resulting in greater pressure on corporate environmental protection

Method used

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  • Production method of PVB resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Add 100L hydrochloric acid with a content of 30wt% to 8 tons of PVA aqueous solution with a concentration of 9wt%, mix and stir evenly at 95°C (rotation speed 100r / min, stir for 2h), and lower the temperature of the solution to 10°C, add positive Butyraldehyde (above 99% purity) 500kg; After the addition of butyraldehyde is completed, the reaction temperature is raised to 13°C, and kept stirring for 30min (rotating speed 120r / min); then the temperature is slowly raised to 70°C for 2h, and at this temperature Keep for 1h (continue stirring, rotating speed 90r / min); after the heat preservation is over, add 30wt% NaOH aqueous solution to make the system pH reach 5, and keep for 30min; After cooling down to 30°C, add 1wt% sodium hypochlorite aqueous solution, and wash the reaction product 6 times in the centrifuge (add about 2 tons of washing liquid each time, and directly feed water while centrifuging in the centrifuge); then transfer the wet product back to the kettle Use...

Embodiment 2

[0054] The production method provided in Example 1 was adopted to obtain the finished PVB resin; the difference was that a 2wt% sodium hypochlorite aqueous solution was added.

Embodiment 3

[0056] The finished PVB resin was obtained by adopting the production method provided in Example 1; the difference was that 3 wt % sodium hypochlorite aqueous solution was added.

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Abstract

The invention provides a PVB resin production method, and the method comprises the steps: a) mixing a PVA aqueous solution, hydrochloric acid and butyraldehyde, carrying out a reaction, carrying out first pH value adjustment, and maintaining for 20-40 min to obtain a reaction mixture; b) cooling the reaction mixture obtained in the step a), centrifugally washing the reaction mixture with a sodium hypochlorite aqueous solution for 4-8 times, adjusting the pH value for the second time, keeping the pH value for 30-60 minutes, centrifugally washing the reaction mixture with deionized water for 1-3 times, and finally centrifugally dewatering and drying the product to obtain PVB resin; wherein the concentration of the sodium hypochlorite aqueous solution is 1wt%-3wt%. Compared with the prior art, the production method provided by the invention adopts specific steps, conditions and parameters, realizes better overall interaction, can realize high-efficiency water saving and increase the yield, and the obtained product has better quality, and has the advantages of favorable adhesive strength, high light transmittance, low haze, low yellowing, favorable water resistance and favorable water resistance after being manufactured into a PVB membrane; and the method can be applied to manufacturing of various laminated glass.

Description

technical field [0001] The present invention relates to the technical field of PVB resin production, more specifically, relate to a kind of production method of PVB resin. Background technique [0002] Polyvinyl butyral (PVB) is a condensation product of polyvinyl alcohol (PVA) and butyraldehyde under acidic conditions. The molecule of polyvinyl butyral contains three main groups of butyraldehyde, acetoxy and hydroxyl groups, which can undergo various reactions such as saponification of acetyl groups, esterification and sulfonation of hydroxyl groups, and has a long branch chain, making it It has good flexibility, low glass transition temperature, high tensile strength and elongation at break, and has good adhesion to glass, metal, ceramics and other materials. [0003] The production process of polyvinyl butyral is the most widely used precipitation method, which is to dissolve polyvinyl alcohol in water, carry out aldol condensation reaction with butyraldehyde under acidi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/28C08F16/06C09J129/14
CPCC08F8/28C09J129/14C08F16/06
Inventor 徐寅徐加广盛雪强薛伟强沈伟良章建飞
Owner HUZHOU XINFU NEW MATERIALS CO LTD
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