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Process for preparing high-hydroxyl-value polyester resin

A technology of polyester resin and high hydroxyl value, which is applied in the field of synthesis of high molecular polymer materials, can solve the problems of increased viscosity, easy volatilization, and affecting the water resistance of the resin, and achieve the effect of stable performance

Inactive Publication Date: 2008-06-04
BASF SHANGHAI COATINGS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The polyester resin synthesized by such one-step feeding method often has a wide range of molecular weight distribution, and the molecular weight can range from 550 to 350,000; among them, the large molecular weight fraction with a molecular weight of 10,000 to 50,000 accounts for about 1 / 3 of the whole resin. Fractions will cause the viscosity of the system to increase, so that in order to achieve the viscosity suitable for coatings when manufacturing coatings, a large amount of solvents have to be added, which will cause environmental pollution and do not meet the requirements of environmental protection; Molecular weight fractions account for about 1 / 5 of the resin as a whole. These small molecular weight fractions will not only affect the water resistance of the resin, but also easily volatilize during the curing process, affecting the curing and film formation of the resin.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1, Comparative Example 1

[0022] This example aims to demonstrate the use of hydrogenated phthalic anhydride, namely hexahydrophthalic anhydride, to improve the weather resistance of the resin.

[0023] The synthetic formulas of Example 1 and Comparative Example 1 are shown in Table 1.

[0024] Table 1

[0025] Example 1

[0026] The synthesis process of Example 1 is as follows: hexahydrophthalic anhydride and 1 / 2 of trihydroxypropane are weighed according to the formula, put into the reactor, heated, and protected by nitrogen. Raise the temperature to 160°C (reflux phenomenon occurs in the reactor at this time), start to slowly increase the temperature (5~10°C / hour) to 200°C, keep it for two hours, then add the remaining 1 / 2 trimethylolpropane and continue to slowly increase the temperature To 240 ℃, keep for 3 to 5 hours, until the acid value is less than 5. Cool to 100°C, add xylene, propylene glycol methyl ether acetate and butyl acetate, and adjust...

Embodiment 2

[0032] Example 2, Comparative Example 2

[0033] The purpose of this example is to show that the selection of monomers with good hydrolysis resistance can help improve the water resistance of the resulting resin.

[0034] The synthetic formulas of Example 2 and Comparative Example 2 are shown in Table 3.

[0035] table 3

[0036] Example 2

[0037] In Comparative Example 2, the diols are neopentyl glycol and hexanediol (the molar ratio is 1:1). In Example 2, neopentyl glycol is used instead of all hexanediol; then both formulas are The process of Example 1 was synthesized. The synthesized resin was made into paint, and the water resistance test was conducted. The experimental results are shown in Table 4.

[0038] Table 4

[0039] Time to soak in distilled water

[0040] It can be seen that after completely replacing the easily hydrolyzed hexanediol with neopentyl glycol, the resin paint film is not prone to foaming after a long time of soaking.

Embodiment 3

[0041] Example 3, Comparative Example 3

[0042] The purpose of this example is to show that the selection of straight-chain long-carbon chain diols, namely hexanediol, can effectively enhance the flexibility and impact resistance of the resin.

[0043] The synthetic formulas of Example 3 and Comparative Example 3 are shown in Table 5.

[0044] table 5

[0045] Example 3

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Abstract

The invention relates to a preparation method of polyester resin having high hydroxy value. Raw materials of the invention comprise polybasic acid, polyol and diluent; the invention is characterized in that: the esterification polymerization of the polybasic acid and the polyol is completed through the method of multistep feeding so as to obtain the polyester resin with solid content of 70-80 percent in mass, hydroxy value of 3.5-5.5 percent and viscosity of 1500-8000cm<2> / s; the resin yielded is employed as crosslinking agent after being added with HDI biuret and HDI trimer to prepare aviation coatings, which is characterized by high solid content, good wettability to pigments, excellent environmental protection, weatherability, impact resistance and chemical resistance and so on.

Description

Technical field [0001] The invention relates to a method for synthesizing a high molecular polymer material, in particular to a method for preparing a polyester resin with a high hydroxyl value. The polyester resin has high solid content and low viscosity, which is helpful for the preparation of solvents. Low, high-quality coatings that meet environmental protection requirements, especially aviation coatings used on aircraft. Background technique [0002] Polyester resin is widely used as the basic raw material of coatings because of its high reactivity, stable performance of the cured paint film, excellent aging resistance and good coloring. The traditional synthesis method of polyester resin is a one-step synthesis method, that is, all the raw materials are put into the reactor at the beginning, and the temperature is heated to about 220-250°C under the condition of nitrogen gas. After the acid value reaches the required value, Add solvent to adjust viscosity and discharge. Pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/12
Inventor 郑会廉晏莉
Owner BASF SHANGHAI COATINGS CO LTD
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