KR870001644B1 - Process for preparing of fire-paints - Google Patents

Abstract

This invention relates to a heat-resisting paint whose heatresisting property is improved. Xylene, cellosolvoacetate, butylacrylate, stylenemonomer, methylmetacrylate, acrylate and 2- hydroxyethlmetacrylate are mixed and this mixt. is reacted at 120-130≰C to give resin soln.. The produced resin soln. is reacted with silicon resin and the silicon resin mixt. is mixed with polypropylenesulfide resin, aluminum oxide, pigments and organic solvent to give the heat-resisting paint.

Description

Manufacturing method of small type heat resistant paint

The present invention relates to a method for producing a small-type heat resistant paint having extremely excellent heat resistance, which is mainly composed of silicone modified resin and ceramic.

Until now, paints developed for the purpose of insulation, heat resistance, and flame retardant are mainly composed of thermoplastic resin and thermosetting resin as a colorant, and inorganic materials are added, and flame retardant is added to general paint to increase flame retardant effect.

Other special forms include foam-type fire-retardant paints, but it is difficult to expect satisfactory heat resistance and ductility.

Japanese Patent Publication No. 46-34790 has developed a heat-resistant acid-resistant paint by using a silicone-modified epoxy resin and a silicone-modified acrylic resin as a colorant and by adding graphite to it, but it is difficult to obtain a desired level of heat resistance.

As inorganic materials, mica, asbestos, calcium hydroxide, and other refractory materials are used to improve the heat resistance. However, these refractory materials lose the water resistance once subjected to high heat because the colorants or adhesives that bind them are decomposed at high temperatures. Insufficient binding force, the inorganic powder is easily detached from the coating film and loses the function of the coating film.

In addition, paints containing flame retardants generate mostly harmful decomposition gases at high temperatures, and also, as the colorants are decomposed at high temperatures, they lose their physical properties as coatings once subjected to high heat.

In addition, when the coating film is subjected to a high temperature, the foamable flame retardant paint decomposes a part of its components to generate a non-combustible gas, and the coating film is expanded to several tens of times, and the expanded coating film is divided into a plurality of vesicles to have a thermal insulation effect. High heat is not conducted.

However, once the coating film foamed by high temperature, the surface strength is weakened and the surface is easily roughened, so it has to be aesthetically painted.

The present invention is capable of withstanding up to about 800 ° C by adding alumina oxide and a polypropylene sulfide resin, which is a heat-resistant resin reinforcing agent, which improves heat resistance and heat insulation effect and develops a colorant that can withstand higher temperatures than conventionally used colorants. A heat resistant film was obtained.

The method for producing a heat-resistant coating material according to the present invention as described above is a butyl acrylate, styrene monomer, methyl methacrylate, 2-hydrate in a solution in which cellosolveacetate is dissolved in xylene as a first step. A liquid composition composed of oxyethyl methacrylate and acrylic acid was added and polymerized at 120-130 ° C. for about 5 hours, and then silicone resin was added thereto and reacted at 150 ° C. for 30 minutes to 1 hour to give a clear and transparent liquid silicone modified resin. Get

As a second step, the present invention relates to a method for producing a heat-resistant coating material characterized by dispersing alumina oxide, polypropylene sulfide resin, aluminum magnesium silicate hydrate, and a pigment as a plating agent.

In the one-step process described above, styrene monomer, methyl methacrylate, 2-hydroxyethyl methacrylate and the like are copolymerized, and acrylic acid exhibits the function of their crosslinking agent.

In addition, when reacting the composition (composition liquid) with xylene and cellosolve acetate in the mixed solution, 10-20% of the composition was added to maintain an initial polymerization degree, the reaction mixture was maintained at 120 ° C for about 30 minutes, and the temperature was raised to 125 ° C. It reacts by dripping over time, and it ages at 130 degreeC for about 2 hours.

In addition, in the one-step reaction, a catalyst is used, but benzoyl peroxide, which is a peroxide, is used.

In the two-step process, the polysilicon sulfide resin pulverized to 500 or more meshes is mixed with the modified silicone resin, sufficiently stirred, and then added to the remaining composition, thereby making it more effective in obtaining heat and chemical resistance.

In addition, alumina oxide and aluminum magnesium silicate hydrate have excellent dispersibility and can prevent sedimentation of ostrich components in the solution, so that a uniform composition can be maintained in the solution state.

Originally, the silicone resin is a resin having excellent heat resistance, water resistance, weather resistance, and anti-oxidation ability, but by modifying the silicone resin as in the present method, it is possible to reinforce physical properties such as adhesion ability, film formation ability, abrasion resistance, and adhesion ability. By forming a feed resin and alumina oxide, heat insulation and heat resistance can be improved significantly.

In addition, an organic solvent such as xylene, butanol, MIBK, etc. may be used for viscosity control, and iron oxide, chromium, silver powder, etc., which are known as flame retardant, may be used to achieve the desired purpose.

Coating of the paint produced by the present method can be performed without using a curing agent, but when fast drying is required, a curing agent mixed with toluene diisocyanate, ethyl acetate, trimethyl alcohol or furopan is used.

When the cured coating film is baked in the range of 200 ° C to 250 ° C, the coating film has heat resistance that can withstand heat of almost 800 ° C.

As described so far, the paints produced by the present invention may be comparable or superior in physical properties to conventional heat-resistant paints, and in particular, incomparable in heat resistance. Therefore, the technical configuration and effects of the present invention can be made clear.

Example 1

The mixed solution of 70 parts of xylene and 30 parts of cellosolve acetate was maintained at 120 ° C. by weight, followed by 30 parts of butyl acrylate, 18 parts of styrene monomer, 18 parts of methyl methacrylate, 33 parts of 2-hydroxyethyl methacrylate and 1 acrylic acid. The negative liquid composition (12%) was first reacted for about 30 minutes and then raised to 125 ° C. The remaining liquid composition (88%) was added dropwise for about 3 hours, followed by aging at 130 ° C for 2 hours.

Again, the resin solution after the reaction was raised to 150 ° C., and 100 parts of the silicone resin was added thereto and reacted for 30 minutes while uniformly mixing to obtain a clear and transparent silicone modified resin solution.

5 parts of polypropylene sulfide resin was added to 50 parts of the silicone-modified resin thus obtained, and stirred uniformly. Then, the mixture was dispersed and adjusted by the weight ratio of 40 parts of alumina oxide, 2 parts of magnesium aluminum silicate hydrate, and 3 parts of iron oxide, and then an appropriate amount of xylene was added. To obtain a heat resistant paint.

As a result of the physical property test with the heat resistant paint obtained above, the following experimental values were obtained.

1) Heat resistance measurement: When the temperature is gradually raised and heated, it starts to discolor in the range of 450 ℃ -480 ℃, and the discoloration becomes severe as the temperature increases, and it starts to blacken at 780-800 ℃, and then completely carbonizes the coating film after about 1 hour. Turned into.

2) Flame-retardant measurement of the coating material: 1C㎥ cube of wood (pine) with 0.5 mm thick coating on the entire surface, and then heated and carbonized at 380-400 ℃. Even if it rose, it was blocked by the coating film and did not burn.

3) Shrinkage (wrinkling) and crack test of the coating film: Cracks and wrinkles did not occur as a result of repeating the temperature 100 times at a temperature interval of 20 ° C to 100 ° C for 30 minutes.

4) Adhesion test: A wooden coating of 0.5 mm was formed and aspirated with a vacuum pump, and the film was ruptured at 0.3 atm.

The physical properties of the paint according to the above-described embodiment (1) can be said to be equivalent to or superior to those of the conventional heat-resistant paint, and in particular, the heat resistance is extremely excellent, so that a heat-resistant paint that can be widely used for industrial equipment and the like can be obtained.

Claims (1)

In preparing a coating composition of synthetic resin, a liquid composition consisting of butyl acrylate, styrene monomer, methyl methacrylate, 2-hydroxyethyl methacrylate and acrylic acid in a mixture of xylene and cellosolve acetate at 120-130 ° C The resin solution obtained by the reaction is reacted with a silicone resin to obtain a silicone-modified resin, which is dispersed by adding a polypropene sulfide resin, alumina oxide, magnesium aluminum silicate hydrate, a metal oxide pigment, and a suitable organic solvent. Method for producing a heat-resistant paint characterized in that the composition.