Synthetic method of low-viscosity polyvinyl butyral resin

A technology of polyvinyl butyral resin and polyvinyl alcohol, which is applied in the field of preparation of organic polymer compounds, can solve the problems of difficult control of distribution and side reactions, poor product batch stability, and low production efficiency, and achieve strong molecular Designability, good batch stability, and high reactivity

Inactive Publication Date: 2017-12-22
SICHUAN DONGFANG INSULATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention is aimed at the deficiencies of the prior art, that is, the molecular weight and its distribution and side reactions in the process route of preparing low-viscosity PVB resin after degradation of high-viscosity PVA resin are not easy to control, slow degradation rate, low production efficiency, and stable product batches In order to avoid problems such as poor performance, by screening low-viscosity PVA resins, mixing different grades of low-viscosity PVA resin raw materials in proportion, and then preparing low-viscosity PVB resins through a specific process, a viscosity (10% ethanol solution) between 10-50mPa·s, hydroxyl content between 12-17%, acetal group content between 75-85%, acetyl group content <3%, and batch-stable low-viscosity PVB resin

Method used

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  • Synthetic method of low-viscosity polyvinyl butyral resin
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  • Synthetic method of low-viscosity polyvinyl butyral resin

Examples

Experimental program
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Embodiment 9

[0049] A kind of synthetic method of low-viscosity polyvinyl butyral resin, the steps are as follows:

[0050] a. Preparation of polyvinyl alcohol / n-butyraldehyde water emulsion:

[0051] 100 parts by mass of low-viscosity polyvinyl alcohol and 900 parts by mass of water are fed. After feeding, the temperature is raised to 90° C. and kept for 2 hours (to completely dissolve the polyvinyl alcohol), and the temperature is lowered to 35° C. and filtered to obtain (mass percentage concentration of 10% ) polyvinyl alcohol aqueous solution, then drop into 55 parts by mass of n-butyraldehyde, 0.5 parts by mass of antioxidant, 0.1 part by mass of emulsifier, and stir at 35°C (at high speed) for 20min to obtain a polyvinyl alcohol / n-butyraldehyde aqueous emulsion, Cool the polyvinyl alcohol / n-butyraldehyde aqueous emulsion to below 10°C for later use;

[0052] Described low-viscosity polyvinyl alcohol can be any one or the mixture of two or more in the polyvinyl alcohol (being called ...

Embodiment 10

[0059] A kind of synthetic method of low-viscosity polyvinyl butyral resin, the steps are as follows:

[0060] a. Preparation of polyvinyl alcohol / n-butyraldehyde water emulsion:

[0061] 100 parts by mass of low-viscosity polyvinyl alcohol and 1900 parts by mass of water are fed. After feeding, the temperature is raised to 98° C. and kept for 2 hours (so that the polyvinyl alcohol is completely dissolved), and the temperature is lowered to 45° C. and filtered to obtain (mass percentage concentration of 5% ) polyvinyl alcohol aqueous solution, then drop into 60 parts by mass of n-butyraldehyde, 0.8 parts by mass of antioxidant, 0.2 parts by mass of emulsifier, and stir at 45°C (high speed) for 20min to obtain a polyvinyl alcohol / n-butyraldehyde aqueous emulsion, Cool the polyvinyl alcohol / n-butyraldehyde aqueous emulsion to below 10°C for later use;

[0062] Described low-viscosity polyvinyl alcohol can be any one or the mixture of two or more in the polyvinyl alcohol (being ...

Embodiment 11

[0069] A kind of synthetic method of low-viscosity polyvinyl butyral resin, the steps are as follows:

[0070] a. Preparation of polyvinyl alcohol / n-butyraldehyde water emulsion:

[0071] 100 parts by mass of low-viscosity polyvinyl alcohol and 1500 parts by mass of water are fed. After feeding, the temperature is raised to 94° C. and kept for 2 hours (so that the polyvinyl alcohol is completely dissolved), and the temperature is lowered to 40° C. and filtered to obtain (mass percentage concentration of 6.25%) ) polyvinyl alcohol aqueous solution, then drop into 58 parts by mass of n-butyraldehyde, 0.7 parts by mass of antioxidant, 0.15 parts by mass of emulsifier, and stir at 40°C (high speed) for 15min to obtain polyvinyl alcohol / n-butyraldehyde water emulsion, Cool the polyvinyl alcohol / n-butyraldehyde aqueous emulsion to below 10°C for later use;

[0072] Described low-viscosity polyvinyl alcohol can be any one or the mixture of two or more in the polyvinyl alcohol (being...

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Abstract

The invention discloses a synthetic method of low-viscosity polyvinyl butyral resin. The synthetic method is characterized by comprising the following steps: mixing low-viscosity polyvinyl alcohol with water for dissolving, adding n-butanal, an antioxidant and an emulsifying agent at 35-45 DEG C, carrying out high-speed stirring, dropwise adding an inorganic acid water solution, heating to 30 DEG C for reacting for 2-3h, heating to 40-45 DEG C, and replenishing n-butanal for reacting to obtain slurry; and adjusting the pH value with an alkaline liquid, washing, dehydrating and drying, so as to obtain the low-viscosity polyvinyl butyral resin. The resin has the performance as follows: the viscosity of a 10% polyvinyl butyral resin-ethanol solution is 10mPa.s-50mPa.s, the hydroxyl content is 12%-17%, the aldehyde acetal group content is 75%-85%, and the acetyl content is less than 3%. The prepared low-viscosity polyvinyl butyral resin can be applied to the fields of ink, coatings, adhesives and the like.

Description

technical field [0001] The invention belongs to the preparation of organic polymer compounds, and relates to a synthesis method of low-viscosity polyvinyl butyral resin. The low-viscosity polyvinyl butyral resin prepared by the invention can be applied to the fields of printing ink, paint, adhesive and the like. Background technique [0002] Polyvinyl butyral (referred to as PVB) is a non-toxic, odorless and non-corrosive resin obtained by acetalization of polyvinyl alcohol (referred to as PVA) and n-butyraldehyde under acid catalysis. The hydroxyl group, acetal group and a small amount of acetyl group in the PVB molecular structure respectively endow PVB molecules with excellent adhesion, impact resistance, hydrophobicity and other characteristics. At the same time, PVB resin also has excellent light transmission, solubility, film-forming It is widely used in automobile safety glass, architectural safety glass, photovoltaic packaging, ink, coating, adhesive and other field...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F16/06C08F8/28C08F6/00C08L29/14
CPCC08F8/28C08F6/005C08F16/06C08L29/14
Inventor 刘明徐康林廖曦曹学
Owner SICHUAN DONGFANG INSULATING MATERIAL
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