JPS63270773A - Heat-resistant anticorrosive coating composition - Google Patents

Abstract

PURPOSE:To obtain an anticorrosive coating compsn. capable of readily forming a coating film having excellent heat resistance and flexibility and improved chemical resistance, by dissolving or dispersing a polyborosiloxane resin and an inorg. filler in an org. solvent. CONSTITUTION:An anticorrosive coating compsn. is obtd. by dissolving or dispersing a polyborosiloxane resin (a) and an inorg. filler (b) in an org. solvent. Remarkable chemical resistance improvement can be attained by employing an inorg. filler meeting either of the following conditions (i) and (ii). (i): at least a conductive filler, such as a metallic filler, and an anticorrosive filler, such as a ceramic filler, are used. (ii): at least two types of inorg. fillers, of the same kind or different kinds, having different average particle sizes d1 and d2 are employed, said d1 and d2 satisfying the relationship d1<=15mu and d1/d2>=5, with the proviso that d1>=d2.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a heat-resistant) 93 food paint using polyborosiloxa 21 fat with improved chemical resistance.

(Prior art) Paints whose main component is silicone resin have been known as heat-resistant anti-corrosion paints, and the coatings formed using these paints have water resistance and chemical resistance. Although it has the advantage of being excellent, the heat resistance temperature is only 250℃ at most.
Since the temperature is around 11°C, its uses are limited.

On the other hand, in recent years, a paint film containing polyborosiloxane resin as the main component dissolved in an organic solvent is coated on a substrate and fired at high temperatures, resulting in a mineralized, or ceramic, coating film with an angle of /100°. It is attracting attention because it has excellent heat resistance, such as being able to withstand regular use at temperatures of C or higher.

(Problems to be Solved by the Invention) However, while the coating film obtained with the paint using this polyborosiloxane resin has the advantage of excellent heat resistance as described above, it has poor chemical resistance (acid resistance, resistance to However, there is a problem that paints are not resistant to alkali (alkali), which limits their usage, and there is a strong desire for heat-resistant paints that can be used in a wider range of applications.

The present invention was made to solve these conventional problems, and it is possible to easily form a coating film with excellent heat resistance and flexibility, and to improve the chemical resistance of the resulting coating film. The purpose of the present invention is to provide an improved heat-resistant anticorrosive paint.

[Structure of the Invention] (Means for Solving the Problems) The heat-resistant anticorrosive paint of the present invention is obtained by dissolving or dispersing (a) a polyborosiloxane resin and (b) an inorganic filler in an organic solvent. It is characterized in that (a) a polyborosiloxane resin, (a) a silicone resin, and (b) a structural filler are dissolved or dispersed in an organic solvent.

As the polyborosiloxane (A) used in the present invention, any known polyborosiloxane (A resin) can be used, and its main skeleton is represented by the following formula <I).

(The following is a blank space) In the present invention, it is also possible to use the silicone resin (a') in combination with this polyborosiloxane resin.

When using this silicone resin, the blending amount is (a)
5 to 100 parts by weight of polyborosiloxane resin
A range of 500 parts by weight is preferable. If the amount of silicone resin is less than 5 parts by weight, the effect of improving the flexibility of the coating film will not be sufficiently obtained, and if it exceeds 500 parts by weight, the excellent properties of the polyborosiloxane resin will not be obtained. Heat resistance is reduced. .

In addition, the inorganic fillers used in the present invention include metals such as aluminum, copper, copper alloys, iron, stainless steel, magnesium oxide, aluminum oxide, copper oxide,
iron oxide, zirconium oxide, titanium oxide, chromium oxide,
Metal oxides such as cobalt oxide, nickel oxide, manganese oxide, molybdenum oxide, tungsten oxide, lanthanum oxide, antimony oxide, bismuth oxide, vanadium oxide, mica, monohydirconium acid, magnesium oxide, titanium oxide, monoarsenic boron acid, Oxide ceramics such as aluminum oxide, thorium oxide, uranium oxide, silicon oxide, zirconium silicate, silicon carbide, titanium carbide, zirconium carbide, titanium boride, zirconium boride, titanium nitride, porous nitride, hyaluminum nitride , non-acid monoarsenic ceramics such as silicon nitride and molybdenum silicide, S
Glass, C glass, S glass, A glass, D glass, potassium titanate, etc. may be used alone or in combination, but at least one of the following applies. By selecting iH to
Chemical resistance is greatly improved.

■ Use at least two types of fillers: a conductive filler such as a metal type filler and an anticorrosive filler such as a ceramic type filler.

■ Same fif! Or, if two or more types of inorganic fillers with different average particle sizes are used, and the average particle sizes d1 and d2 of each of these inorganic fillers are dl>d2, dl ≦15μ mark and d + / ' Satisfy l-12≧5.

Furthermore, the same effect can be obtained by setting the stirring conditions so that the average particle diameter (l) and average thickness t of the inorganic filler after being dissolved or dispersed in an organic solvent satisfy the following conditions.

d≦7μm and d/t≧3 The blending amount of the inorganic filler (B) is based on 100 parts by weight of the polyborosiloxane resin (A), or this component (A) and the silicone (A′) are mixed. Total amount with resin 10
The amount is preferably in the range of 5 to 500 parts by weight based on 0 weight of straw. If the amount of the inorganic filler is less than 5 parts by weight, the effect of improving heat resistance and softening properties will not be sufficiently obtained, and if it exceeds 500 parts by weight, the mechanical properties of the coating film will be poor.

In addition, in the present invention, known coloring pigments, baking curing catalysts, and other additives may be added in addition to the above-mentioned components within a range that does not impair the effects of the present invention.

The heat-resistant anticorrosive paint of the present invention is manufactured, for example, as follows.

In other words, N
-Dissolved or dispersed in a polar solvent such as methyl-2-pyrrolidone or dimethylformamide, or a non-polar organic solvent such as toluene or xylene, or dissolved or dispersed in a similar solvent in advance.
Mix the liquid by dissolving or dispersing it in a solvent,
It can be obtained by stirring this thoroughly.

The thus obtained heat-resistant anticorrosive paint of the present invention can be coated onto a substrate such as a metal plate by a conventional method and baked to form a coating film with excellent heat resistance and also good chemical resistance. is formed.

(Function) By using the above-mentioned means, heat resistant temperature 400
It is possible to obtain a coating film that satisfies excellent heat resistance of at least °C and also has excellent chemical resistance.

(Example) Next, examples of the present invention will be described.

Example 1 100 parts by weight of Volivo 17 siloxane resin was mixed with N-methyl-
Resin solution A was obtained by dissolving it in 80 parts by weight of 2-pyrrolidone.

Next, 20 parts by weight of graphite flakes as a conductive filler and 20 parts by weight of crow flakes as an anticorrosive filler were added to 100 parts by weight of this resin solution A, and the mixture was stirred with a mixer for 3 hours to obtain heat-resistant An anticorrosion paint was obtained.

Using the heat-resistant anticorrosive paint obtained in this way, it was applied to an aluminized steel plate using a spray gun and heated to an iH temperature of 400°C.
A coating film was formed by heating and baking at 30°C for 30 minutes. Then,
The resulting coating film was tested for heat resistance at 400°C, acid resistance, and alkali resistance. The results are shown in Table 1.

Example 2 The same amount of graphite flakes and glass flakes as in Example 1 were added to the resin solution A obtained in Example 1, and the mixture was stirred with an attritor for 20 hours to prepare heat-resistant anticorrosive coating 1. 1rJf fever 1! The same test as in Example 1 was conducted using /j food coating v1. The results are shown in Table 1.

The comparative examples in the table include Chinoku Comparative Example 1) in which a coating film was formed using only resin solution A under the same conditions as Example 1, and 20 parts by weight of crow flakes added to 100 parts by weight of resin solution A. These are the test results of a film formed by coating under the same conditions as in Example 1 (Comparative Example 1).

These results are also shown in Table 1.

(The following is a margin.) Table 1 *1: It is held at 400°C and is shown by the time at which cracks or peeling occurred in the coating film (the same applies below).

*2: Indicates the time taken for corrosion of the base material to occur after being immersed in a 10% 1I2so solution at 80°C (the same applies below).

*3: Indicates the time taken for corrosion of the base material to occur after immersion in a 10% NaOH solution at 80°C (the same applies below).

Example 3.11 100 parts by weight of polyborosiloxane resin and 1 part by weight of 100 parts by weight of silicone resin were dissolved in 80 parts by weight of N-methyl-2-pyrrolidone to obtain β(fat solution B).

Next, the same amount of graphite l as in Example 1 was added to this resin solution B.
- A heat-resistant anticorrosive paint (Example 3) in which flakes and glass flakes were added and stirred for 3 hours in a mixer in the same manner as in Example 1; and an IvJ heat-resistant anticorrosive paint in which flakes and glass flakes were added and stirred in an attritor for 20 hours in the same manner as in Example 2 (Example 3); Example 4) were obtained.

Using each heat-resistant anticorrosive paint thus obtained, a coating film was formed under the same conditions as in Example 1, and the same tests as in Example 1 were conducted. The results are shown in Table 2.

Note that the comparative examples in the table include one in which a coating film was formed using only resin solution B under the same conditions as in Example 3 (comparative example 3), and one in which a coating film was formed using only resin solution B under the same conditions as in Example 3 (comparative example 3), and one in which a coating film was formed using 100 parts by weight of resin solution B and 20. jlij
These are the test results of Chinoku Comparative Example 4) in which a coating film was formed under the same conditions as Example 3 with the addition of 50%.

These results are also shown in Table 2.

Table 2 Examples 5 to 7 Based on 100 parts by weight of the resin solution A obtained in Example 1, the average particle size was 20 μ+m, 12. um, 8μIIl, 3μ+
n, 1μIn, 0.8μml, and 0.2μ++1 noalumina powder were added in the formulation @M'' shown in Table 3, and mixed in a ball mill for 20 hours to obtain i5J thermal anticorrosive paints.

Using these heat-resistant anti-corrosion paints, stainless steel plates (SO
8304> and baked at 400°C for 30 minutes to form a coating film.Then, the resulting coating film had 500°C heat resistance (standard test), acid resistance, alkali resistance, and steam resistance. and bendability tests were conducted. The results are shown in Table 4.

In addition, in the comparative example in the table, a heat-resistant anticorrosive coating v1 was prepared under the same conditions as Example 5 by adding different types of alumina powder,
These are test results for each coating film formed in the same manner. These results are also shown in Table 4.

(Margin below) Table 3 Table 4, 4: Group pAl11 test after holding at 500'C (indicated by the number of remaining squares after adhesion testing with 100 squares, according to n (the same applies hereinafter).

*5: Indicates the time required for the coating film to crack or peel off due to 130°C steam (the same applies below).

(The same applies below).

Examples 8 to 10 Glass flakes (average particle size 10 μm, average J7 size 4 μm
m) was added and stirred under the following conditions to obtain heat-resistant anticorrosive paints.

Example 8 Stirring with a near triter for 10 hours.

Example 9 Li1 stirring for 20 hours with a near writer.

Example 10: Ball mill for 30 hours 137. Stir.

The average particle diameter and average J7 diameter of the glass flakes dispersed in each of the heat-resistant anticorrosive paints thus obtained were measured. The results are shown in Table 5.

Next, each of these heat-resistant anticorrosive paints was applied to a stainless steel plate (SUS 430) using a spray gun, and baked at a temperature of 100°C for 30 minutes to form a coating film. 500℃ heat resistance of each coat (
Tests were conducted on the base rotist, acid resistance, alkali resistance, and bendability. The results are shown in Table 5.

In addition, each comparative example of Shishichu was obtained by stirring the same mixed solution as in Example 8 under the following conditions. , are the test results of each g!! film formed using these iVJ thermal anticorrosion coating ↑1 under the same conditions as in Example 8. These results are also shown in Table 5.

Comparative Example 9: Stirred for 3 hours with a blind speed mixer.

Comparative Example 10 Fi2 stirring for 5 hours with a near writer.

Comparative Example 11 Stirred for 40 hours with a near writer.

Comparative Example 12: Stirred in a ball mill for 20 hours.

(Hereinafter referred to as "Kinpaku") Table 5 [Effects of the Invention] As is clear from the above examples, the heat-resistant anticorrosive paint of the present invention not only has excellent heat resistance but also has chemical resistance of the coating film. It has excellent properties and can be widely applied to various uses.

Applicant Showa Cable and Wire Co., Ltd. Agent Patent Attorney Sa Suyama - (1 idiot) Procedural Nerti Official Book August 28, 1988 Vf Correction Agency Director Kunito Ogawa 1988 Patent Application No. 107213 2 Invention Name of heat-resistant anti-corrosion paint 3 Relationship with the case of the person making the amendment Patent applicant 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City (225) Showa Rai FA Denjima Co., Ltd. Representative Sat 1) Yoshio 4 Representative Person: 2-1 Kanda Tamachi, Chiyoda-ku, Tokyo (1 idiot) 5 Date of amendment order 6 Column for detailed explanation of the details of the statement subject to amendment.

7 Contents of the amendment (1) "Dimethylformamide" on page 9, lines 6-7 of MeiIfII1gi is corrected to "dimethylacemamide."

(2) Correct ``80'' in line 3 of page 13 of Appearance A to ``1160.''

that's all

Claims (10)

[Claims] (1) A heat-resistant anticorrosive paint characterized by dissolving or dispersing (a) a polyborosiloxane resin and (b) an inorganic filler in an organic solvent. (2) The heat-resistant anticorrosive paint according to claim 1, which contains at least two types of conductive fillers and anticorrosion fillers as the inorganic filler (b). (3) The inorganic filler in (b) contains two or more types of inorganic fillers of the same type or different types with different average particle sizes, and the average particle sizes d_1 and d_2 of each of these inorganic fillers are d_1 >d_2, the heat-resistant anticorrosive paint according to claim 1, which satisfies d_1≦15 μm and d_1/d_2≧5. (4) Claim 1, wherein the average particle diameter d and average thickness t of the inorganic filler (b) after being dissolved or dispersed in an organic solvent satisfy d≦7 μm and d/t≧3. Heat-resistant anti-corrosion paint. (5) The heat resistance according to any one of claims 1 to 4, which contains 5 to 500 parts by weight of the inorganic filler (b) per 100 parts by weight of the polyborosiloxane resin (a). Anti-corrosion paint. (6) A heat-resistant anticorrosive paint characterized by dissolving or dispersing (a) a polyborosiloxane resin, (a') a silicone resin, and (b) an inorganic filler in an organic solvent. (7) The heat-resistant anticorrosive paint according to claim 6, which contains at least two types of conductive filler and anticorrosive filler as the inorganic filler (b). (8) The inorganic filler in (b) contains two or more types of inorganic fillers of the same type or different types with different average particle sizes, and the average particle sizes d_1 and d_2 of each of these inorganic fillers are d_1 >d_2, the heat-resistant anticorrosive paint according to claim 6, which satisfies d_1≦15 μm and d_1/d_2≧5. (9) Claim 6, wherein the average particle diameter d and average thickness t of the inorganic filler (b) after being dissolved or dispersed in an organic solvent satisfy d≦7 μm and d/t≧3. Heat-resistant anti-corrosion paint. (10) Contains 5 to 500 parts by weight of the silicone resin (A') per 100 parts by weight of the polyborosiloxane resin (A), and contains a combination of the polyborosiloxane resin (A) and the silicone resin (A'). The heat-resistant anticorrosive paint according to any one of claims 6 to 9, which contains 5 to 500 parts by weight of the inorganic filler (b) per 100 parts by weight in total.