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Process for preparing high-hydroxyl-value polyester resin

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

Inactive Publication Date: 2010-08-18
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] The purpose of this example is to demonstrate the selection of hydrogenated phthalic anhydride, ie, hexahydrophthalic anhydride, to improve the weatherability of resins.

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

[0024] Table 1

[0025]

[0026] The synthesis technique of Example 1 is as follows: weigh hexahydrophthalic anhydride and 1 / 2 of trihydroxypropane into the reaction kettle according to the formula, heat, and feed nitrogen protection. Be warmed up to 160 ℃ (return phenomenon occurs in the reactor at this moment), start to heat up slowly (5~10 ℃ / hour) to 200 ℃, keep warm for two hours, then add the remaining 1 / 2 of trimethylolpropane, continue to heat up slowly To 240 ℃, and then keep warm for 3 to 5 hours, until the acid value is less than 5. After cooling to 100° C., xylene, propylene glycol methyl ether acetate and butyl acetate were added to adjust the ...

Embodiment 2

[0032] Example 2, Comparative Example 2

[0033] The purpose of this example is to demonstrate that the selection of monomers with good hydrolytic stability 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]

[0037]

[0038] In Comparative Example 2, the diols were neopentyl glycol and hexanediol (molar ratio of 1:1), and in Example 2, neopentyl glycol was used to replace all hexanediol; then both formulations were as The process of Example 1 is used to synthesize. The resin obtained by synthesis was made into a paint, and a water resistance test was carried out. The experimental results are shown in Table 4.

[0039] Table 4

[0040] Time to soak in distilled water

[0041] It can be seen that after the easily hydrolyzed hexanediol is completely replaced with neopentyl glycol, the resin paint film is less likely ...

Embodiment 3

[0042] Example 3, Comparative Example 3

[0043] The purpose of this example is to demonstrate that the selection of a straight-chain long carbon chain diol, namely hexanediol, can effectively enhance the flexibility and impact resistance of the resin.

[0044] The synthetic formulas of Example 3 and Comparative Example 3 are shown in Table 5.

[0045] table 5

[0046]

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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 preparing the solvent dosage Low, high-quality coatings that meet environmental protection requirements, especially aerospace coatings applied on aircraft. Background technique [0002] Polyester resin is widely used as the basic raw material of paint due to its high reactivity, stable performance of cured paint film, excellent aging resistance and good colorability. The traditional synthesis method of polyester resin is a one-step feeding synthesis method, that is, put all the raw materials into the reaction kettle at the beginning, heat it to about 220-250 ° C under the condition of nitrogen, and keep the temperature until the acid value reaches the requirement. Add solvent to adjust viscosity and d...

Claims

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Application Information

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