Polyester resin with high humidity and heat resistance and high irradiance as well as preparation method and application thereof

A polyester resin and irradiance technology, applied in the field of polyester resin, can solve the problems of acid value, viscosity and weather resistance that cannot meet the long-term protection requirements of highway guardrails, high price, poor mechanical properties, etc. The effect of production and wide application, short synthesis time and super weather resistance

Active Publication Date: 2018-12-21
GUANGZHOU KINTE IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Chinese patent application CN106700845A relates to a high-weather-resistant powder coating for high-speed guardrails. The polyester resin used is a super-weather-resistant resin, and the price is relatively high. At present, all super-weather-resistant polyesters have poor mechanical properties.
There have been many patent disclosures to independently improve the weather resistance and water boiling resistance of polyester resins for powder coatings, but the polyester resins disclosed in the prior art have poor acid value, viscosity, glass transition temperature, and especially mechanical properties. , weather resistance, weather resistance in high humidity environment and other comprehensive properties cannot meet the long-term protection requirements of road guardrails in southern my country

Method used

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  • Polyester resin with high humidity and heat resistance and high irradiance as well as preparation method and application thereof
  • Polyester resin with high humidity and heat resistance and high irradiance as well as preparation method and application thereof
  • Polyester resin with high humidity and heat resistance and high irradiance as well as preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The preparation steps of embodiment 1 polyester resin:

[0052] 1) Add polyhydric alcohol into the reaction kettle according to the proportion of Example 1 in Table 1, heat up to the melting of the material, then add polyacid and catalyst, and raise the temperature to 180°C within 1h under the protection of nitrogen, and then rise to 180°C within 2h 210°C, keep warm for 1.5h, then continue to heat up to 220°C within 1h, and rise to 250°C within 2h for esterification reaction, the acid value reaches 13-18mgKOH / g, vacuumizes for 2h, the acid value reaches 5-8mgKOH / g, Esterification products are obtained;

[0053] 2) Under the protection of nitrogen, add an acidolysis agent to the esterification product and carry out acidolysis reaction at 245°C for 3 hours to obtain an acidolysis product with an acid value of 35-40 mgKOH / g;

[0054] 3) The acid hydrolysis product was subjected to polycondensation reaction at a vacuum degree of -0.095MPa for 2 hours, the acid value reache...

Embodiment 2

[0055] The preparation steps of embodiment 2 polyester resins:

[0056] 1) Add polyhydric alcohol into the reaction kettle according to the proportion of Example 2 in Table 1, heat up to the melting of the material, then add polyacid and catalyst, and raise the temperature to 180°C within 1h under the protection of nitrogen, and then rise to 180°C within 2h 210°C, keep warm for 1.5h, then continue to heat up to 220°C within 1h, and within 2h to 245°C for esterification reaction for 7h, the acid value reaches 7-9mgKOH / g, vacuumizes for 2h, the acid value reaches 1-3mgKOH / g , to obtain esterification products;

[0057] 2) Under the protection of nitrogen, add an acidolysis agent to the esterification product and carry out acidolysis reaction at 235°C for 4 hours to obtain an acidolysis product with an acid value of 41-46 mgKOH / g;

[0058] 3) The acid hydrolysis product was subjected to polycondensation reaction at a vacuum degree of -0.092MPa for 3 hours, the acid value reached...

Embodiment 3

[0059] The preparation steps of embodiment 3 polyester resins:

[0060] Step 1) is with the step 1) of embodiment 2, and difference is to add by the raw material of embodiment 3 and proportioning;

[0061] 2) Under the protection of nitrogen, add an acidolysis agent to the esterification product and carry out acidolysis reaction at 235°C for 4 hours to obtain an acidolysis product with an acid value of 50-55 mgKOH / g;

[0062] 3) The acid hydrolysis product was subjected to polycondensation reaction at a vacuum degree of -0.089MPa for 4 hours, the acid value reached 40-45mgKOH / g, the hydroxyl value was less than 3mgKOH / g, the melt viscosity at 200°C was 6500-7500mPa.s, and the temperature was lowered to 180- At 210°C, add additives and stir to disperse evenly to obtain polyester resin.

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Abstract

The invention discloses polyester resin with high humidity and heat resistance and high irradiance as well as a preparation method and application thereof. An acid value of the polyester resin is 25 to 45 mg KOH / g, a hydroxyl value is smaller than 3mgKOH / g, a glass transition temperature is 55 to 70 DEG C, 200 DEG C melt viscosity is 4500 to 7500 mPa.s, and 180 DEG C reactivity is 210 to 310s. Thepolyester resin disclosed by the invention has the performance of appropriate acid value, lower hydroxyl value, appropriate glass transition temperature, melt viscosity, reactivity and the like. Thepolyester resin disclosed by the invention has the advantages of concise preparation technology short synthesizing time and low preparation cost; the prepared polyester resin has good hue and is favorable for large-scale production and wide application; meanwhile, when the polyester resin is prepared into powdery paint, the powdery paint has excellent mechanical property, further has very strong weather resistance under the high humidity and heat environment and is especially suitable for protecting outdoor products under the weather with high humidity and heat and high irradiance in southernof China.

Description

technical field [0001] The invention relates to the technical field of polyester resins, in particular to a polyester resin resistant to high humidity and heat and high irradiance, a preparation method and application thereof. Background technique [0002] In recent years, my country's demand for road or expressway guardrails is increasing. The guardrails are formed by cold rolling of steel pipes and hot-rolled steel plates, so they need to be coated for protection. [0003] At present, highway guardrails are basically protected by the traditional coating method of hot-dip galvanizing or additional coating after galvanizing. However, if only galvanized or sprayed with alkyd paint or plastic sprayed after galvanizing, the protective layer has more or less problems such as corrosion resistance, impact resistance, adhesion or aging resistance, which affect the quality of the guardrail. service life. Powder coatings are popular because of their low pollution, resource saving, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G63/20C08G63/78C09D167/02C09D5/03
CPCC08G63/20C08G63/78C09D5/03C09D167/02
Inventor 曾定李勇谢静罗逸顾宇昕刘亮
Owner GUANGZHOU KINTE IND
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