Hydrolysis-resistant polyester polyol and preparation method thereof

A polyester polyol and polyether polyol technology, applied in polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve poor hydrolysis resistance, low addition amount, adhesive performance, high temperature resistance And other problems such as poor performance, to achieve good hydrolysis resistance, improve adhesion, and enhance the effect of initial adhesion

Active Publication Date: 2013-04-17
XUCHUAN CHEM SUZHOU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since polyester polyols can provide greater intermolecular forces, polyester two-component polyurethane adhesives have good mechanical properties and good heat resistance. Poor compatibility, especially the viscosity of the prepared high-temperature-resistant solvent-free adhesive cannot be controlled, resulting in difficulty in sizing, poor adhesion and other quality problems; when used in solvent-free adhesives, the viscosity of the adhesive is often too high High, poor compatibility with other additives, resulting in difficulty in sizing, poor adhesion and other quality problems
However, the polyether-type two-component polyurethane adhesive is poor in bonding performance and high temperature resistance.
The mixed two-component polyurethane adhesive includes a mixture of polyester and polyether, its heat resistance is still not good, an

Method used

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  • Hydrolysis-resistant polyester polyol and preparation method thereof
  • Hydrolysis-resistant polyester polyol and preparation method thereof
  • Hydrolysis-resistant polyester polyol and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The hydrolysis-resistant polyester polyol is prepared from the following components by weight: 30 parts of succinic acid, 10 parts of isophthalic acid, 15 parts of ethylene glycol, and 0.0005 parts of stannous octoate.

[0032] Its preparation method comprises the following steps:

[0033] (1) Mix aliphatic dibasic carboxylic acid, aromatic dibasic acid or carboxylic acid anhydride and dihydroxy polyol under nitrogen protection to obtain mixed raw materials;

[0034] (2) Raise the temperature of the mixed raw materials to 150°C, and the reaction starts;

[0035] (3) Continue to heat up and vacuumize at the same time; when the temperature rises to 210°C and the vacuum reaches 300 mbar, add additives;

[0036] (4) When the temperature rises to 230°C and the vacuum reaches 20 mbar, distill under reduced pressure to reduce the pressure to 10 mbar;

[0037] (5) Distill under reduced pressure to a pressure of 3-5 mbar, and continue to distill until the acid value is below 2...

Embodiment 2

[0039] The hydrolysis-resistant polyester polyol is prepared from the following components by weight: 20 parts of succinic anhydride, 20 parts of terephthalic acid, 20 parts of diethylene glycol, and 0.0010 parts of dibutyltin dilaurate.

[0040] Its preparation method comprises the following steps:

[0041] (1) Mix aliphatic dibasic carboxylic acid, aromatic dibasic acid or carboxylic acid anhydride and dihydroxy polyol under nitrogen protection to obtain mixed raw materials;

[0042] (2) Raise the temperature of the mixed raw materials to 130°C, and the reaction starts;

[0043] (3) Continue to heat up and vacuumize at the same time; when the temperature rises to 190°C and the vacuum reaches 500 mbar, add additives;

[0044] (4) When the temperature rises to 220°C and the vacuum reaches 200 mbar, distill under reduced pressure to reduce the pressure to 30 mbar;

[0045] (5) Distill under reduced pressure to a pressure of 3-5 mbar, and continue to distill until the acid val...

Embodiment 3

[0047] The hydrolysis-resistant polyester polyol is made of the following components in parts by weight: 40 parts of adipic acid, 5 parts of dimethyl terephthalate, 25 parts of 1,2-propylene glycol, and 0.0015 parts of dibutyltin.

[0048] Its preparation method comprises the following steps:

[0049] (1) Mix aliphatic dicarboxylic acid, aromatic dibasic acid or carboxylic acid anhydride and polyol under nitrogen protection to obtain mixed raw materials;

[0050] (2) Raise the temperature of the mixed raw materials to 140°C, and the reaction starts;

[0051] (3) Continue to heat up and vacuumize at the same time; when the temperature rises to 200°C and the vacuum reaches 400 mbar, add additives;

[0052] (4) When the temperature rises to 225°C and the vacuum reaches 100 mbar, distill under reduced pressure to reduce the pressure to 20 mbar;

[0053] (5) Distill under reduced pressure to a pressure of 3-5 mbar, and continue to distill until the acid value is below 2 and the hyd...

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Abstract

The invention provides hydrolysis-resistant polyester polyol which is prepared by the following components in parts by weight: 20-50 parts of aliphatic dicarboxylic acid or carboxylic acid anhydride, 5-20 parts of aromatic dibasic acid or ester, 15-50 parts of polyol, and 0-0.002 parts of assistant. Polyester polyol is good in reactivity, compatibility and hydrolysis resistance. When 10-100% of polyester polyol is added for preparing a flexibly packaged adhesive, the adhesive strength, heat resistance and weather resistance of the adhesive can be improved significantly, and meanwhile the initial adhesion of the adhesive can be enhanced.

Description

technical field [0001] The invention belongs to the field of chemical products, and in particular relates to a hydrolysis-resistant polyester polyol used in a solvent-free polyurethane adhesive, and also relates to a preparation method of the hydrolysis-resistant polyester polyol. Background technique [0002] At present, solvent-free polyurethane adhesives include one-component adhesives and two-component polyurethane adhesives. [0003] Since there is no small molecule of solvent in the solvent-free polyurethane adhesive, the intermolecular force is strong, and hydrogen bonds are easily formed, so the viscosity of the adhesive is very high at room temperature. Although the viscosity can be effectively reduced by raising the temperature, too high a temperature will easily cause the adhesive to gel and form a high-molecular-weight resin, resulting in difficulty in coating or uneven coating. Therefore, it is very important to control the temperature of adhesive coating. Usua...

Claims

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Application Information

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IPC IPC(8): C08G63/181C08G63/183C08G63/672C08G63/676C08G63/54C08G63/20C08G63/49C08G63/78C08G18/42C08G18/68C09J175/06C09J175/14
Inventor 胡洪国吕华波江平
Owner XUCHUAN CHEM SUZHOU
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