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Pure epoxy system low-temperature curing coating material composition for carbon fiber substrate, and coating material thereof

A carbon fiber substrate and curing coating technology, applied in epoxy resin coatings, coatings, etc., can solve the problems of high melt viscosity, poor powder storage stability, difficult flow of coating films, etc., and achieve high hardness and good anti-corrosion performance. , The effect of low temperature fast curing

Inactive Publication Date: 2016-11-30
福建万顺粉末涂料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, the curing system of powder coating is a low-temperature latent curing system. If the system has high low-temperature reactivity, it will inevitably affect the stability of powder powder extrusion and storage. On the other hand, the resin used in powder coatings and curing All agents are solids with a relatively high softening point, and have high melt viscosity at low temperature. When solidified at low temperature, the coating film is difficult to level and affect the surface effect.
If the resin and curing agent with a lower softening point are used, the melt viscosity can be reduced, but the storage stability of the powder becomes poor, and it needs to be stored in low temperature refrigeration, which brings a lot of inconvenience to the use

Method used

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  • Pure epoxy system low-temperature curing coating material composition for carbon fiber substrate, and coating material thereof
  • Pure epoxy system low-temperature curing coating material composition for carbon fiber substrate, and coating material thereof
  • Pure epoxy system low-temperature curing coating material composition for carbon fiber substrate, and coating material thereof

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preparation example Construction

[0034]The present invention further provides a method for preparing a low-temperature curing flat coating material, which is characterized in that it is prepared by using the low-temperature curing flat coating composition of the present invention, which includes the following steps: a surface pretreatment step, a spraying step, and a curing step.

[0035] In the surface pretreatment step, conventionally used methods can be used, as long as the sprayable conditions of the powder coating composition can be achieved, there is no special requirement.

[0036] The spraying step is carried out at 40-90° C.; it can be carried out by using conventional spraying equipment, but as long as a flat coating can be obtained, it can be used.

[0037] Curing step, rapid curing in 3 minutes at a temperature below 130°C.

Embodiment 1

[0040] First, take 500g as modified epoxy resin EEW, 100g as phenolic curing agent G-92, 10g as leveling agent PL-200, 3g benzoin, 5g acid catalyst, 2g alkali catalyst, 10g wax powder ( PE-520), 300g of titanium dioxide are put into the mixing tank; after being co-extruded by the melt extruder, and then cooled by the blower fan, the tablet material is obtained; the obtained tablet material is pulverized and ground twice to obtain a fine powder, In the secondary grinding process, a heat exchanger is used to convey cold air for cooling to obtain a fine powder; after being separated by a cyclone separator, it is sieved through a sieve to detect a finished product. Secondly, the carbon fiber is pretreated, and the coating composition is sprayed on the carbon fiber pretreated at 90° C., and cured at 130° C. for 15 minutes in a curing oven with hot air circulation to obtain a coating material.

[0041] According to the method of Example 1, the coating material is obtained. Visually ...

Embodiment 2

[0043] First, weigh 400g of EEW as modified epoxy resin, 100g of type 2 BPA, 100g of G-92 as phenolic curing agent, 10g of PL-200 as leveling agent, 3g of benzoin, 5g of acid catalyst, 2g of base catalyst , 10g of wax powder (PE-520), and 300g of titanium dioxide are put into the mixing tank; after being co-extruded by the melt extruder, and then cooled by the blower fan, the tablet material is obtained; the obtained tablet material is pulverized twice Grind to obtain fine powder, and use heat exchanger to transport cold air to cool in the secondary grinding process to obtain fine powder; after being separated by cyclone separator, and then sieved through sieve, the finished product is detected. Secondly, the carbon fiber is pretreated, and the coating composition is sprayed on the carbon fiber pretreated at 90° C., and cured at 130° C. for 15 minutes in a curing oven with hot air circulation to obtain a coating material.

[0044] According to the method of Example 2, the surf...

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Abstract

The invention relates to a low-temperature curing coating material composition for a carbon fiber substrate, wherein the low-temperature curing coating material composition comprises type 2-4 BPA or phenol formaldehyde modified epoxy resin, a phenolic curing agent, and a catalyst. According to the present invention, the application problem of the carbon fiber primary coat is solved; and the low-temperature fast curing is achieved (120 DEG C@15 min), the thickness of the one-time formed film is more than 100 [mu]m, the leveling is good, the PCI grade is more than 8, the hardness is high, and the pencil hardness is more than 1 H while the good corrosion resistance is provided.

Description

technical field [0001] The invention relates to a pure epoxy system low-temperature curing coating composition used for carbon fiber substrates, in particular, it belongs to the field of energy-saving, environment-friendly and low-temperature curing new materials. Background technique [0002] Carbon fiber materials are not temperature-resistant and have strict requirements on curing temperature. There are high requirements for coating film thickness and leveling grade. Oil-based paints are generally used in the market, because a large amount of solvent is used, which limits the application of oil-based paints to carbon fiber substrates. There are many problems in the water-based coatings currently available in the market, such as: the cost is too high, it is not a complete environmental protection coating, and the coating film performance is not good, such as the hardness is not high, the surface gloss is not enough, and the film cannot reach a sufficient thickness at one ...

Claims

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Application Information

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IPC IPC(8): C09D163/00C09D7/12
CPCC09D163/00C08L91/06C08K2003/2241
Inventor 陈桂书
Owner 福建万顺粉末涂料有限公司
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