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Synthesis method of high-density polyvinyl butyral resin

A technology of polyvinyl butyral resin and synthesis method, which is applied in the direction of chemical/physical/physicochemical fixed reactors, etc., and can solve problems such as unstable feeding, unwinding, and overhead equipment

Active Publication Date: 2014-12-10
ZHEJIANG DECENT PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using domestic PVB resin to produce PVB film, the ratio of powder / sheet is at most about 40%. Adding powder to the formula will cause problems such as unstable feed, overhead equipment, and unwinding. In this way, the production The PVB film yellow index is relatively large

Method used

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  • Synthesis method of high-density polyvinyl butyral resin
  • Synthesis method of high-density polyvinyl butyral resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 300kg of PVA solids were dropped into 4315kg of pure water, and the temperature was raised to 97° C. to make a PVA aqueous solution with a solution mass fraction of 6.5%. Cool down to 50-60 degrees and pump the PVA solution into the figure 1 , 2 In the condensation reaction kettle shown, the reaction kettle has three layers of two-bladed paddles 1; the paddles 1 are inclined at a certain angle, and the angle between them and the horizontal plane is 45°; the reaction kettle also has two pieces symmetrically installed at 0 degrees -180 degrees away from the wall plate baffle structure; the stirring motor of the reactor is transformed into a variable frequency speed regulating motor. Start stirring and increase the speed to 110r / min, add 171KG n-butyraldehyde solution, continue to cool down to 35-45 degrees to obtain polyvinyl alcohol / n-butyraldehyde mixed solution; when the temperature is 22.5°C, add hydrochloric acid solution (its pure The mass ratio of mass to PVA is ...

Embodiment 2

[0034] 300kg of PVA solids were dropped into 3986kg of pure water, and the temperature was raised to 95° C. to make a PVA aqueous solution with a solution mass fraction of 7.0%. Cool down to 50-60 degrees and pump the PVA solution into figure 1 , 2 In the said condensation reactor. Start stirring and raise the rotating speed to 95r / min, add 171KG n-butyraldehyde solution, continue to cool down to 35-45 degrees to obtain polyvinyl alcohol / n-butyraldehyde mixed solution; when the temperature is 24°C, add hydrochloric acid solution (its pure The mass ratio of mass to PVA is 0.2), then the temperature is raised and maintained at 82°C; after the reaction is completed, add sodium hydroxide solution to fully neutralize it, then wash with pure water, centrifuge, and dry.

Embodiment 3

[0036] 300kg of PVA solids were dropped into 3700kg of pure water, and the temperature was raised to 96.5° C. to make a PVA aqueous solution with a solution mass fraction of 7.5%. Cool down to (50-60) degrees and pump the PVA solution into figure 1 , The condensation reactor shown in 2. Start stirring and increase the speed to 100r / min, add 171KG n-butyraldehyde solution, continue to cool down to (35-45) degrees to obtain polyvinyl alcohol / n-butyraldehyde mixed solution; when the temperature is 23.5°C, add hydrochloric acid solution (the The mass ratio of pure mass to PVA is 0.2), and then the temperature is raised to maintain at 86.5°C; after the reaction is completed, add sodium hydroxide solution to fully neutralize it, then wash with pure water, centrifuge, and dry to obtain .

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Abstract

The invention relates to a synthesis method of high-density polyvinyl butyral resin. The method comprises the following steps: adding certain weight of PVA and pure water to a melting kettle, and then raising temperature to 90-99 DEG C, wherein the mass fraction of PVA in a solution can be just controlled to be 6%-9.04%; cooling and pumping the solution into a transformed reaction kettle, starting stirring and increasing the rotating speed to (85-130)r / min; adding an n-butanal solution, and cooling, so as to obtain a polyvinyl alcohol / n-butanal mixed solution; when the temperature is 20-25 DEG C, adding an inorganic acid, and then raising and maintaining the temperature at 80-90 DEG C; and adding a sodium hydroxide solution to the reacted solution to fully neutralize the solution, washing with pure water, centrifuging and drying, so as to obtain the high-density polyvinyl butyral resin, wherein the transformed reaction kettle comprises a three-layer and two-blade structure, the bevel angles of the blades are 45 degrees, and the structure of a baffle plate is increased. According to the method, the high-density polyvinyl butyral resin of which the bulk density reaches 0.3g / cm<3> is successfully produced.

Description

technical field [0001] The invention relates to a synthesis method of a thermoplastic polymer compound, in particular to a processing technology of a high-density polyvinyl butyral resin. Background technique [0002] Polyvinyl butyral resin products are thermoplastic polymer materials and are the main raw materials for the production of polyvinyl butyral (PVB) film. The PVB resin powder is plasticized with a special plasticizer, and then extruded into a PVB film by a twin-screw extruder. PVB adhesive film has become an essential raw material for the production of various safety glass due to its excellent optical properties, high temperature resistance, low temperature resistance, mechanical properties and good adhesion to inorganic glass. When producing PVB film, the bulk density of PVB resin particles used as raw materials is very important. If the bulk density is too small, that is, the powder is too light, it is not conducive to the feeding of the screw, and the feedin...

Claims

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Application Information

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IPC IPC(8): C08F16/06C08F8/28C08F16/38C08F6/12B01J19/18
Inventor 胡建清
Owner ZHEJIANG DECENT PLASTIC
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