Heat-resistant low-viscosity polyvinyl acetal resin and preparation method thereof

A technology of polyvinyl acetal resin and polyvinyl alcohol, which is applied in the field of organic compounds and its preparation, can solve the problems of poor heat resistance of PVB resin, lack of heat-resistant groups, promotion, etc., and achieve stability over time Good, simple process, low viscosity effect

Inactive Publication Date: 2020-03-24
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Wherein polyvinyl butyral (English abbreviation " PVB ") resin is a kind of in polyvinyl acetal resin, the PVB resin prepared in the prior art (for example: " a kind of low viscosity polyvinyl acetal resin disclosed by CN103193905A Butyral resin, preparation method and application thereof", CN107501445A discloses "a kind of synthetic method of low-viscosity polyvinyl butyral resin" and CN102395609A discloses "continuous production of polyvinyl butyral"), due to PVB long The chains are full of acetal groups and hydroxyl groups, lacking heat-resistant groups. The test shows that the obtained PVB resin has poor heat resistance (glass transition temperature 76°C-90°C, melting range 105°C-120°C). At the same time, PVB resin The improvement of the viscosity stability over time when the resin forms a solution also reaches a bottleneck

Method used

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  • Heat-resistant low-viscosity polyvinyl acetal resin and preparation method thereof
  • Heat-resistant low-viscosity polyvinyl acetal resin and preparation method thereof
  • Heat-resistant low-viscosity polyvinyl acetal resin and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] A preparation method of a heat-resistant low-viscosity polyvinyl acetal resin, the steps are: add 100 g of polyvinyl alcohol and 1000 g of deionized water into a dissolution kettle at room temperature, raise the temperature to 95° C., and stir to completely dissolve it into polyvinyl acetal resin. After filtering the vinyl alcohol aqueous solution, then lower the temperature to 40°C, add 52g of n-butyraldehyde, 6g of formaldehyde, 0.6g of antioxidant 1010, and stir at high speed for 30min to obtain a uniform mixed solution of polyvinyl alcohol / n-butyraldehyde; / N-butyraldehyde mixed solution and hydrochloric acid aqueous solution with a mass concentration of 1.0% at 20°C in a ratio of 100:20 by volume, within 8 minutes at the same time through their respective pipelines and continuously enter the tubular reactor with heating and cooling functions , reacted for 20 minutes, and then transferred all the materials to an aging kettle with a stirring speed of 100r / min and an i...

Embodiment 2

[0025] A method for preparing a heat-resistant low-viscosity polyvinyl acetal resin, the steps are: add 100 g of polyvinyl alcohol and 900 g of deionized water into a dissolution kettle at room temperature, raise the temperature to 93° C., and stir to completely dissolve it into polyvinyl acetal resin. After filtering the vinyl alcohol aqueous solution, then lower the temperature to 35°C, add 54g of n-butyraldehyde, 7g of acetaldehyde, 0.8g of antioxidant 1010, and stir at high speed for 30min to obtain a uniform polyvinyl alcohol / n-butyraldehyde mixed solution; Alcohol / n-butyraldehyde mixed solution and hydrochloric acid aqueous solution with a mass concentration of 1.0% are at 20°C in a ratio of 100:16 by volume, and enter the tubular reaction with heating and cooling functions continuously through their respective pipelines within 8 minutes at the same time device, reacted for 20min, and then transferred all materials to an aging kettle with a stirring speed of 100r / min and ...

Embodiment 3

[0027] A preparation method of a heat-resistant low-viscosity polyvinyl acetal resin, the steps are: add 100 g of polyvinyl alcohol and 900 g of deionized water into a dissolution kettle at room temperature, raise the temperature to 95° C., and stir to completely dissolve it into a polyvinyl acetal resin. After filtering the vinyl alcohol aqueous solution, then lower the temperature to 35°C, add 53g of n-butyraldehyde, 8g of benzaldehyde, and 0.7g of antioxidant 1076, and stir at high speed for 30min to obtain a uniform polyvinyl alcohol / n-butyraldehyde mixed solution; Alcohol / n-butyraldehyde mixed solution and hydrochloric acid aqueous solution with a mass concentration of 1.0% are at 20°C in a ratio of 100:20 by volume, and enter the tubular reaction with heating and cooling functions continuously through their respective pipelines within 8 minutes at the same time device, reacted for 20min, and then transferred all materials to an aging kettle with a stirring speed of 100r / m...

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Abstract

The invention discloses heat-resistant low-viscosity polyvinyl acetal resin as shown in a formula (I). A preparation method of the heat-resistant low-viscosity polyvinyl acetal resin comprises the following steps: preparing a polyvinyl alcohol / n-butyraldehyde mixed solution; continuously feeding the polyvinyl alcohol / n-butyraldehyde mixed solution and a 0.5-1.5% hydrochloric acid aqueous solutioninto a tubular reactor with heating and cooling functions through respective pipelines at the same time at 20 DEG C according to a volume ratio of 100: (15-25) for reaction for 10-20min; transferringthe materials to an aging kettle with the temperature of 20-40 DEG C, stirring the materials for reaction for 1 hour, heating the aging kettle to 45-55 DEG C, and performing reaction for 1-2h; and adjusting the pH value of the reaction solution to 10, washing the product with deionized water, and centrifugally drying the product to obtain the heat-resistant low-viscosity polyvinyl acetal resin. The heat-resistant low-viscosity polyvinyl acetal resin prepared by the invention is suitable for the fields of thermoplastic adhesives, heat-seal paints, hot melt adhesives, transmission equipment coatings and the like.

Description

technical field [0001] The invention belongs to organic compounds and their preparation, and relates to a heat-resistant low-viscosity polyvinyl acetal resin and its preparation method. The heat-resistant low-viscosity polyvinyl acetal resin prepared by the invention not only has the characteristics of low viscosity when forming a solution and good stability of viscosity over time, but also has good heat resistance and can be applied to thermoplastic adhesives , heat seal paint, hot melt adhesive, transmission equipment coating and other fields. Background technique [0002] Polyvinyl acetal resin is an important chemical product. Its molecular structure contains hydroxyl groups, polycyclic rings and acetyl groups. It has high transparency, good cold resistance, water resistance, film-forming properties and impact resistance. Glass, metal, wood, ceramics, leather, fiber and other materials have good bonding properties. In addition, it has good dispersibility for pigments a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28
CPCC08F8/28C08F16/06
Inventor 喻永连蒋政通袁港徐康林
Owner SICHUAN DONGFANG INSULATING MATERIAL
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