JPS63168468A - Heat-resistant coating composition - Google Patents

Abstract

PURPOSE:To provide the title compsn. having excellent resistance to heat and corrosion, by blending a polyfunctional epoxy resin with fine powders of a specified natural mineral. CONSTITUTION:A polyfunctional epoxy resin (A) (e.g., a novolak epoxy resin having a novolak content of 40-60%) is blended with fine powder of a natural mineral (B) having a high K content and a low Ca content.

Description

[Detailed Description of the Invention] The present invention relates to a heat-resistant coating composition containing an epoxy resin as a main component, and particularly a polyfunctional epoxy resin containing a high potassium (K) content. Heat resistance obtained by adding fine natural mineral powder.

This invention relates to corrosion-resistant epoxy paints.

Zagoe JumeiIn general, bisphenol A-type epoxy resin has been widely used as epoxy paints up until now, but as the applications expand, specialized high performance is required in each field, and in particular, heat resistance. It is well known that bisphenol A type epoxy resins do not provide sufficiently satisfactory performance in terms of corrosion resistance.

Therefore, it is an object of the present invention to provide an epoxy paint having better heat resistance and corrosion resistance than the conventionally used bisphenol A type epoxy resin. The purpose of this project is to develop a heat-resistant and corrosion-resistant paint using a novolak type epoxy resin, which has a large number of functional groups, unlike bis- and phenol-type epoxy resins.

. As a result of research, the present inventor has found that this objective can be achieved by adding a substance with heat dissipation properties instead of various additives used as conventional fillers. However, as a result of further research, it was found that by adding natural mineral fine powder with a relatively low Ca content, especially natural mineral fine powder with a high potassium (K) content, to a multifunctional epoxy resin, it was possible to achieve significantly superior heat resistance. It was confirmed that corrosion resistance was obtained.

That is, the present invention relates to a heat-resistant and corrosion-resistant coating composition obtained by adding natural mineral fine powder with a high potassium content to a polyfunctional epoxy resin.The reason for using the polyfunctional epoxy resin is as follows. Since bisphenol A type cannot be used at temperatures above 150°C, heat resistance is improved by increasing epoxy functionality to increase heat distortion temperature, especially Novolac 40.
~60% novolanc-based epoxy resins can be suitably utilized for this purpose. -For example, Tobu Kasei (!Xun YD)
Examples include 661 series and ZX-661 series epoxy resins.

In addition, the reason for adding mineral fine powder with a relatively low Ca content, especially natural mineral fine powder with a high content, is natural FE.
, 'JjyJ contains Na, Si.

Fe, A/2. Among the mutually reactive compounds such as Ti, mutually reactive compounds of K and other metal elements, such as KzTibO
This is because +s etc. act extremely effectively as a heat dissipation material.

Example Examples of the present invention are shown below.

Example 1 Dongbu Kasei side type YD-661-75100ffiffi part was mixed with 100 parts by weight of a paint consisting of a high content of ore fine powder (produced in Korea) 100 Methyl Cell Solsolve 10 and Mi composition, and 100 parts by weight of a polyamide amine curing agent manufactured by Tobu Kasei Co., Ltd.
5 parts by weight and 10 parts by weight of methyl ethyl ketone;
The sample was force-dried at 60°C for 10 minutes, and was used as a temporary test piece with a film thickness of 480μ and a temporary N2O, 6-t galvanized plate for comparison with conventional epoxy paints and urethane paints.

The cooling rate of the coated steel sheet heated to 100°C is shown in Table 1, and it is clear that the composition of the present invention has excellent heat dissipation properties.

Table 1 Invention product 60.6 44.5 37.5
34.4 32.9 Conventional epoxy resin 64.0 4
7.9 40.0 36.1 34.0 Conventional urethane resin 50.5 39,9 35,9 33,8 33
．． 0 Invention product 32.0 31.5 31.
1 Conventional epoxy resin 32.7 31.8 31.2
30.9 Conventional urethane resin 32.2 32.0
31.6 30.9 Example 2 Using a paint with the same composition as Example 1, Co was coated without K.
The results of comparison with metal oxide fine powder epoxy paints containing , Mn, Fe, Cu, etc. are shown in Table 2, and it is clear that the composition of the present invention is superior.

Table 2 Invention products 58,1 41,4 33.3
29,1 27.1 Polymerized Poxy Metal Mixture 61.7 4
4.3 37.7 34.4 32.9 Invention product
25,7 24. β 24.4 24.2 24
．． Example 3 of Zero-Polymerized Poxy Metal Mixture The temperature rise time was compared between an aluminum pot whose inner surface was coated with a paint having the same composition as in Example 1 and an uncoated aluminum pot. Using an aluminum pot with a depth of 70 mm and a diameter of 120 mm, 600 cc of water was poured into the pot, and the water was heated with gas at a temperature of 40°C.

The results were as shown in Table 3.

Table 3 Invention products 49.6 58,4 67.1
74.0 80.1 Poxy metal mixture 47.8 5
4.8 61.4 68.9 75.1 Invention product
84.3 88.9 Polymer metal mixture 79.
6 85.4 87.11 LAi UraKuri As is known from the above examples, it is clear that the composition of the present invention has an excellent heat dissipation effect compared to conventional epoxy and urethane-based heat-resistant paints. be.

Claims (1)

[Claims] 1. A heat-resistant coating composition obtained by adding natural mineral fine powder with a high potassium (K) content to a polyfunctional epoxy resin.