JPS63146977A - Waterproofing composition - Google Patents

Abstract

PURPOSE:To obtain an advantageous waterproofing composition capable of exhibiting waterproofing effects with durability without difficulty in application, by blending an organoalkoxysilane with a specific acrylic resin in a specific proportion. CONSTITUTION:A composition obtained by blending (A) an organoalkoxysilane, e.g. butyltrimethoxysilane, etc., with (B) an acrylic resin containing >=55wt% alkyl acrylate having a 1-10C alkyl group, e.g. ethyl acrylate, etc., in an amount of 0.1-10pts.wt. based on 1pt.wt. component (A).

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, the volume expands by as much as 10 inches, 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, The effectiveness of using silane compounds alone is small, the waterproofing effect is uneven, and if the building material is cement products,
The hydrolyzate of cement becomes embedded in the water-repellent capillaries, which eliminates the water-repellent effect, and it is difficult to identify the application area during application, which tends to cause problems such as uncoated areas.

In order to improve these shortcomings, the present inventors conducted intensive research and found that a composition made by adding a specific acrylic resin to a specific silane compound has a waterproof effect that is comfortable to wear and durable. I found that the above also has no disadvantages and is advantageous,
The present invention has now been completed.

That is, the present invention consists of an acrylic resin containing at least 55 units of an acrylic acid alkyl ester having an alkyl group having 1 to 10 carbon atoms and 1 type of organoalkoxysilane, and whose blending ratio is 1 part organoalkoxysilane and 1 part organoalkoxy silane,
0.0% of the acrylic resin per part (f-positioned part; the same shall apply hereinafter).
This is a waterproofing composition comprising 1 to 10 parts of the present invention.

In the present invention, by blending the above-mentioned acrylic resin with organoalkoxysilane, building materials that cannot be made sufficiently water repellent with organoalkoxysilane alone,
Particularly in building materials with porous surfaces, areas that are not microscopically water-repellent with organoalkoxysilane are covered with a resin film to make them water-resistant, and areas that have been made water-repellent are further covered with a resin film to make them extremely durable. It exhibits a strong waterproof effect.

Furthermore, the resin coating on the surface of building materials increases the surface strength, and 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 also 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 % (% formula %) (wherein R1 is an alkyl group or alkoxyalkyl group having 1 to 4 carbon atoms, and R2 is an arbitrary It is a silane compound represented by a saturated alkyl group, aryl group, or cycloalkyl group.

Specific examples of organoalkoxysilanes that are malleable include ethyl-(or butyl-, hexyl-, etc.) trimethoxysilane, methyl (or ethyl-, propyl-, butyl-, etc.)-tris-(2-methoxy-ethoxysilane), etc. )-silane (or) IJ,', -(2-ethoxy-ethoxy)-
silanna), phenyltriethoxysilane, and cresyltriethoxysilane.

These silane compounds can be easily produced by generally known methods.

In addition, the acrylic resin used in the present invention contains 55 or more acrylic acid alkyl esters in which the alkyl group has 1 to 10 carbon atoms, preferably 60 to 10 carbon atoms.
It contains 0%, more preferably 90% to 100%.

If it is less than 55 inches, problems will arise in weather resistance, and phenomena such as yellowing and a decrease in water resistance will occur upon long-term exposure.

The amount of acrylic resin added is 0.1 to 10 parts, preferably 0.5 to 3 parts, per 1 part of organoalkoxysilane.
If the amount is less than 0.1 part, the coating effect of the acrylic resin will be small and there will be a problem in 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 a high water absorption rate and water permeability, resulting in a decrease in water resistance. become inferior in sex.

Examples of the acrylic acid alkyl ester as a constituent monomer of the acrylic resin include methyl acrylate,
Ethyl, n-propyl, 1so-propyl, n-butyl, 1so-butyl, 5ec-butyl, n-amyl, n-
Ester powers such as hexyl, n-hephthyl, n-octyl, 2-ethylhexyl, n-nonyl, n-decyl;

Vinyl monomers to be copolymerized with acrylic acid alkyl ester include methyl, ethyl, and n of methacrylate.
-7'lopyl, 1so-propyl, n-butyl, 1so
esters such as -butyl, 5ec-butyl, n-7mil, n-hexyl, n-hephthyl, n-octylene, 2-ethylhexyl, and hyethylene, propylene, butene-1, pentene, imbutylene, 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 the above, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, Maleic acid and the like are used.

Among the acrylic resins used in the present invention, particularly preferred are acrylic acid methyl, ethyl, n-propyl, butyl,
It is a copolymer consisting of a combination of at least two acrylic esters of 2-ethylhexylnato and another vinyl monomer selected from 1,1,4-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 having a boiling point range of 120 to 180 ° C / 76 ° C (absolute pressure) as aliphatic hydrocarbons,
Aromatic hydrocarbons include toluene, xylene, and trimethylbenzene; chlorinated hydrocarbons include trichlorethylene and perchlorethylene; alcohols include ethyl, n-propyl, 1so-propyl, n-butyl, is
.

-butyl, 5eC-butyl alcohol and diacetone alcohol, ketones such as methyl ethyl ketone, and esters such as ethyl acetate.

Of course, they can be used alone or in combination. Furthermore, 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 composition according to the present invention can be prepared by a known method to prevent scratches.
, 2 to 0.5 kg/rrl, 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. These include concrete, mortar, foamed concrete, glass, ceramics, stone, brick, slate board, silica board, glass fiber, and other materials having 5i-o-bonds, and synthetic resins such as plastic materials.

The present invention will be specifically explained below with reference to Examples. All parts and parts 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 type viscometer manufactured by Iwata Yaiki ■).

2) Water absorption rate: A completely dry material measuring 15α in length, 15 in width and 10F in thickness was treated with a waterproofing composition on its entire surface, cured at room temperature for 3 days, and then soaked in water for 24 hours. After being completely immersed in water, the weight change was measured. The water absorption rate is shown by capacity.

3) Water permeability: A completely dry material measuring 10 cm long and 10 cm wide and 10 cm thick was treated with a waterproofing composition on one side, and after curing at room temperature for 3 days, a transparent vibrator with a diameter of 6 mm and a height of 35 cm was made. Stand it up on the treated surface and seal it with epoxy adhesive. Water is poured into the container so that the water head is 60α, and the amount of water permeation is measured after 24 hours. What is the water permeability? −/m”.

4) Weather resistance; After irradiating the above treated sample for 500 hours using a WESUN-DC type day-cycle sunshine weather meter manufactured by Toyo Rika ■ at a rate of water injection of 6 minutes per hour, 2) 3) Water absorption and water permeability were measured as described in .

Example 1 As shown in Table 1, 0.55% of acrylic acid ethyl ester was added to 1 part of butyltrimethoxysilane as an acrylic resin.
, 0.1 part of methyl methacrylate, 0.2 part of styrene, and 0.15 part of acrylonitrile were polymerized by a conventional method in 5.0 parts of isopropyl alcohol as a solvent, and the viscosity was 16 seconds. A waterproof composition was created.

This is the Civolex ALC manufactured by Civolex ■.
The board was sprayed with air at a density of 0.51 kg/m.

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, changes in water absorption and water permeability are small, and weather resistance is good.

Example 2 A waterproofing composition was prepared using the organoalkoxysilane shown in Table 1 and an acrylic resin consisting of the monomer shown in Table 1 according to the procedure of Example 1, and the results of the same tests are shown in the table below. -1.

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),
Those with a large amount of added resin (Comparative Example 3) and those with a small amount (Comparative Example 4), those where the main component of the added resin is not an acrylic ester (Comparative Examples 5 to 6), and those with a siloxane compound and polymethyl methacrylate resin. What was used (Comparative Example 7)
The performance of each of these as a waterproof composition was investigated 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.

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,
A waterproofing composition characterized in that the blending ratio is 0.1 to 10 parts by weight of the acrylic resin to 1 part by weight of the organoalkoxysilane.