JPS64438B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a waterproof composition comprising an organoalkoxysilane and an acrylic resin. When building materials are exposed to the outside air, they not only lose their weather resistance but also are very likely to be damaged by water. That is, water intrudes into building materials due to wind and rain, and when the infiltrated water freezes in winter, its volume expands by as much as 10%, damaging the building materials. Furthermore, corrosive substances such as sulfur dioxide gas, nitrogen dioxide, and salt in the air penetrate deeply into the materials, causing severe damage to some building materials. Conventionally, organic silane compounds have been used as water-repellent treatment agents to prevent corrosion of building materials due to water penetration. Although such silane compounds are water repellent to liquid water, they are permeable to water vapor, and therefore are not preferred as water repellent treatment agents for building materials. Disadvantages of water repellent treatment agents made of organic silane compounds include poor weather resistance and the water repellent effect on the surface disappears in a short period of time, and if the building material has a porous surface, organic silane compounds may be used. The effectiveness of silane compounds alone is small, the waterproofing effect is uneven, and when the building material is a cement product, the hydrolyzate of the cement gets stuck in the water-repellent capillaries and loses its water-repellent effect, and the water-repellent effect is lost when applied. It is difficult to identify areas, and problems such as unpainted areas are likely to occur. In order to improve these drawbacks, the present inventors
As a result of intensive research, it was discovered that a composition made by adding a specific acrylic resin to a specific silane compound exhibits a remarkable durable waterproofing effect, and is advantageous without any difficulties in construction. I was able to complete it. That is, the present invention consists of an acrylic resin containing at least one organoalkoxysilane and 55% or more of an acrylic acid alkyl ester having an alkyl group having 1 to 10 carbon atoms, and the blending ratio thereof is 1 part (by weight) of the organoalkoxysilane. Department. Same hereafter)
This waterproof composition is made by adding 0.1 to 10 parts of acrylic resin to In the present invention, by blending organoalkoxysilane with the above-mentioned acrylic resin, organoalkoxysilane can be used in building materials that cannot be sufficiently water repellent with organoalkoxysilane alone, especially building materials with porous surfaces. By covering areas that are not microscopically water repellent with a resin film to make them water resistant, and further covering the water repellent areas with a resin film, it exhibits an extremely durable waterproof effect. Furthermore, the surface strength of the building material is increased by applying a resin film to the surface of the building material.This effect is particularly noticeable on building materials with porous surfaces, and even when exposed to the outside air, it is resistant to deterioration due to wind and rain. This is an effect that cannot be obtained by applying a water repellent treatment agent consisting of organoalkoxysilane alone. The organoalkoxysilane used in the present invention generally has the general formula ^R2 -Si( ^OR1 ) ₃ , where ^R1 is an alkyl group or an alkoxyalkyl group having 1 to 4 carbon atoms. and R ² is any saturated alkyl group, aryl group, or cycloalkyl group). Specific examples of such organoalkoxysilanes include ethyl (or butyl, hexyl, etc.) trimethoxysilane, methyl (or ethyl, propyl, butyl, etc.)-tris-(2-
methoxy-ethoxy)-silane (or tris-(2
-ethoxy-ethoxy)-silane, phenyltriethoxysilane, cresyltriethoxysilane, etc. These silane compounds can be easily produced by generally known methods. The acrylic resin used in the present invention contains 55% or more of an acrylic acid alkyl ester in which the alkyl group has 1 to 10 carbon atoms, preferably 60% to 100%, more preferably 90% to 10%. 100
%. If it is less than 55%, there will be problems with weather resistance, and phenomena such as yellowing and decreased water resistance will occur with long-term exposure. The amount of acrylic resin added is 0.1 to 10 parts, preferably 1 part to 1 part of organoalkoxysilane.
The amount is 0.5 to 3 parts, and if it is less than 0.1 part, the coating effect with the acrylic resin will be low and there will be problems with durability. If the amount exceeds 10 parts, the coating effect of the acrylic resin is sufficient, but the water-repellent effect of the organoalkoxysilane on the surface of the building material is small, and the surface becomes easily wetted by water, resulting in an increase in water absorption and water permeability, resulting in a decrease in water resistance. become inferior to Examples of acrylic acid alkyl esters as constituent monomers of such acrylic resins include methyl, ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, sec-butyl, n-amyl, acrylic acid, n-hexyl, n-heptyl,
There are esters such as n-octyl, 2-ethylhexyl, n-nonyl, and n-decyl. Vinyl monomers to be copolymerized with acrylic acid alkyl esters include methyl, ethyl, n-propyl, iso-propyl, and n-methacrylate.
Esters such as -butyl, iso-butyl, sec-butyl, n-amyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, and ethylene, propylene, butene-1, pentene, isobutylene, 1,4 -butadiene, 1,2-butadiene, dimethylbutadiene, vinyl methyl ether, vinyl propyl ether, vinyl acetate, vinyl chloride, vinylidene chloride, acrylonitrile,
Styrene, acrylic esters other than those mentioned above, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, etc. are used. Among the acrylic resins used in the present invention, particularly preferred are copolymers consisting of a combination of at least two acrylic acid esters such as methyl, ethyl, n-propyl, butyl, and 2-ethylhexyl acrylates, or copolymers of these. Acrylic acid ester and methyl methacrylate, styrene, butene-1, 1.4
- It is a copolymer consisting of a combination with other vinyl monomers selected from butadiene, acrylonitrile, etc. The resin of the present invention can be obtained by polymerization by a commonly known conventional method. Furthermore, the waterproof composition of the present invention can be used by diluting it with an organic solvent, but in general, when the organic solvent is already used in a considerable amount as a solvent for polymerizing the resin, There is no need to use it again. Examples of organic solvents include the following: Paraffinic hydrocarbons with a boiling point range of 120-180℃/760mmHg (absolute pressure) as aliphatic hydrocarbons,
Aromatic hydrocarbons such as toluene, xylene, and trimethylbenzene, chlorinated hydrocarbons such as trichlorethylene and perchlorethylene, and alcohols such as ethyl, n-propyl, iso-propyl, n-butyl, iso-butyl, and sec-butyl. Alcohol and diacetone alcohol, etc., ketones such as methyl ethyl ketone, and esters such as ethyl acetate. Of course, they can be used alone or in combination. Further, the waterproof composition of the present invention can be freely colored, and common dyes and pigments can be used as the coloring agent. The waterproofing compositions according to the invention are applied in known manner by spraying, painting or dipping onto the surface of the building material to be waterproofed. Application amount is for 40% silane concentration
It is approximately 0.2 to 0.5 Kg/m ² , but of course it varies depending on the roughness of the surface of the building material. Building materials to which the waterproofing composition of the present invention can be applied include the following. concrete, mortar,
Si- of foamed concrete, glass, ceramics, stone, brick, slate board, silica board, glass fiber, etc.
those with an o-bond, and synthetic resins such as plastic materials. The present invention will be specifically explained below with reference to Examples. All parts and percentages in the examples are by weight. Further, the test method in the examples is as follows. 1. Viscosity of waterproofing composition: Measured at a liquid temperature of 20°C using a viscometer (NK-2 viscometer manufactured by Iwata Yaiki Co., Ltd.). 2. Water absorption rate: A completely dry material measuring 15 cm long, 15 cm wide, and 10 cm thick is treated with a waterproofing composition on the entire surface.
After curing at room temperature for 3 days, the samples were completely immersed in water for 24 hours, and then the weight change was measured. capacity%
shows the water absorption rate. 3 Water permeability: A completely dry material measuring 10 cm long, 10 cm wide and 10 cm thick was treated with a waterproof composition on one side, and after curing at room temperature for 3 days, a transparent pipe with a diameter of 3 cm and a height of 35 cm was treated. Stand it on a surface and seal it with epoxy adhesive. Pour water so that the water head is 30 cm and measure the water permeability after 24 hours. The water permeability was expressed in / ^m2 . 4 Weather resistance: The above treated sample was tested by Toyo Rika Co., Ltd.
After 500 hours of irradiation using a WESUN-DC type dual cycle sunshine weather meter at a rate of 6 minutes of water injection per hour, 2) 3)
The water absorption rate and water permeability were measured as described in . Example 1 As shown in Table 1, 1 part of butyltrimethoxysilane, 0.55 parts of acrylic resin as an acrylic resin, 0.1 part of methyl methacrylate, 0.2 parts of styrene, and 0.15 parts of acrylonitrile were used as a solvent, and 5.0 parts of isopropyl alcohol was added.
A waterproofing composition having a viscosity of 16 seconds was prepared by adding the material polymerized in a conventional manner. This material was air-sprayed onto a Siporex ALC board manufactured by Siporex Co., Ltd. at a concentration of 0.3 kg/m ² . The performance of this waterproofing composition was measured according to the above test method, and the results were good as shown in Table 1. In particular, even after treatment with a weatherometer, the water absorption rate
Changes in water permeability are small and weather resistance is good. Example 2 A waterproofing composition was prepared using the organoalkoxysilane shown in Table 1 according to the procedure of Example 1, and an acrylic resin consisting of the monomer shown in Table 1, and the results of the same tests are shown in the table below. -1.

[Table] Comparative Examples 1 to 5 As shown in Table 2, alkoxysilane alone (Comparative Example 1), resin mainly composed of acrylic acid alkyl ester (Comparative Example 2), resin Those with a large number of added parts (Comparative Example 3) and those with a small number of added parts (Comparative Example 4), those where the main component of the added resin is not an acrylic ester (Comparative Examples 5 to 6), and those using a siloxane compound and polymethyl methacrylate resin. (Comparative Example 7), the performance as a waterproof composition was examined in the same manner. As shown in Table 2, the results are unfavorable as there are defects in the initial waterproofing effect and/or the waterproofing performance after treatment with a weatherometer.

【table】

[Table] *** Comparative Examples 1 to 6 were air spray applied, Comparative Example 5
is brushed

Claims (1)

[Claims] 1 Consisting of an acrylic resin containing at least one organoalkoxysilane and 55% by weight or more of an acrylic acid alkyl ester whose alkyl group has 1 to 10 carbon atoms, and the proportion thereof is based on 1 part by weight of the organoalkoxysilane. acrylic resin
A waterproofing composition characterized in that the content is 0.1 to 10 parts by weight.