JPH05331442A - Adhesive sealing material - Google Patents

Abstract

PURPOSE:To obtain an adhesive sealing material, comprising prescribed amounts of a specific curable resin component, an inorganic filler and aluminum oxide prepared by the vapor synthetic method, excellent in thixotropic properties and appearance and suitable as artificial marble, etc. CONSTITUTION:The adhesive sealing material 2 comprises (A) preferably 30-70wt.% (based on the bonding sealing material) curable resin component consisting essentially of methyl methacrylate and its polymer, (B) preferably 20-50wt.% inorganic filler such as aluminum hydroxide and (C) 1-10wt.% aluminum oxide, obtained by the vapor synthetic method and having, e.g. 10-15nm grain diameter and 80-120m<2>/g specific surface area. This adhesive sealing material is two-pack type and has 5-20 thixotropic index.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive sealing material, particularly an adhesive sealing material suitable for artificial marble.

[0002]

2. Description of the Related Art Conventionally, in the processing of artificial marble, as a method of forming a corner portion with a rounded shape instead of a right angle, as shown in FIG. The artificial marble member 4 for the corner portion is separately provided, and the artificial marble member 4 is shaved and rounded, or FIG.
A method of filling a corner portion with a dedicated adhesive sealing material 5 as shown in (b) has been adopted.

However, in the case of the former, there is a problem that the cutting process of the artificial marble member 4 is troublesome and leads to an increase in cost, and in the case of the latter, the conventional adhesive sealing material causes sagging of the sealing material, which causes rounding. There is a problem that the radius cannot be increased. In addition, the conventional adhesive sealing material has a problem that air bubbles are apt to be trapped therein, so that it is necessary to refill the air bubbles before finishing.

[0004]

DISCLOSURE OF THE INVENTION The present invention is intended to increase the roundness of a corner portion without requiring a complicated process such as a cutting process or a bubble refilling process which leads to an increase in cost in processing an artificial marble. The purpose is to provide various materials.

[0005]

DISCLOSURE OF THE INVENTION The present invention is a mixture of a curable resin component mainly composed of methyl methacrylate and its polymer and an inorganic filler. An adhesive sealing material containing 10% by weight is provided.

The adhesive sealing material of the present invention contains a curable resin component mainly containing methyl methacrylate and its polymer (hereinafter referred to as PMMA) as a resin matrix component. The curable resin component is preferably 30 to 70% by weight of the adhesive sealing material.

The content of methyl methacrylate in the curable resin component is preferably 40 to 70% by weight based on the whole curable resin component. If the content is less than 40% by weight,
This is not preferable because it increases the viscosity and makes it easier for air bubbles to become involved. If the content exceeds 70% by weight, methyl methacrylate may volatilize during the curing reaction, which may cause defects such as cracks in the seal portion, which is not preferable.

The content of PMMA in the curable resin component is
It is preferably 30 to 60% by weight based on the resin component. PMMA preferably has a molecular weight in the range of 30,000 to 70,000. If the molecular weight is less than 30,000, the viscosity required for the sealing material cannot be obtained, and the sealing material may sag during the work, which is not preferable. If the molecular weight exceeds 70,000, the viscosity becomes too high and air bubbles may be easily trapped, which is not preferable.

Other components can be appropriately added to the cured resin component. For example, it is preferable to contain methacrylic acid because the curing time can be shortened. The preferred amount of methacrylic acid used is 1 to 5% by weight of the curable resin component. Methyl methacrylate and the polymer thereof are preferably 95% by weight or more of the curable resin component.

In the present invention, the inorganic filler is preferably used in an amount of 20 to 50% by weight of the adhesive sealing material. The material of the inorganic filler is not particularly limited and various materials can be used, but when aluminum hydroxide is used, the color tone and other physical properties after curing are similar to artificial marble,
It is preferable because high chemical resistance can be obtained. In addition, magnesium hydroxide, calcium carbonate, glass powder and the like can be used as appropriate.

In the adhesive seal material of the present invention, aluminum oxide obtained by the vapor phase synthesis method (hereinafter referred to as vapor phase aluminum oxide) is used in an amount of 1 to 1 with respect to the entire adhesive seal material.
Contains 10% by weight. The vapor-phase aluminum oxide has a feature that it is particularly fine particles as compared with those synthesized by other methods. What is used for the adhesive sealing material of the present invention preferably has a particle diameter in the range of 10 to 15 nm. As the specific surface area, 80 to 120 m ² / g
Are preferred.

If the amount of vapor phase aluminum oxide used is less than 1% by weight, thixotropic properties may not be sufficiently imparted, which is not preferable. Usage is 10
On the other hand, when the content exceeds the weight%, the thixotropic property becomes excessively large and the workability may be deteriorated, which is not preferable. A more preferable content of vapor phase aluminum oxide is 4 to 7% by weight.

The adhesive sealing material of the present invention exhibits high thixotropic properties by containing vapor-phase process aluminum oxide. The thixotropic index is preferably in the range of 5 to 20. The thixotropic index is represented by the ratio of the viscosity at 2 rpm and the viscosity at 20 rpm as measured by a B-type viscometer.

In the present invention, the adhesive sealing material can be cured at room temperature in a short time when a polymerization initiator is added. As the polymerization initiator, diacyl peroxides such as benzoyl peroxide, hydroperoxides such as cumene hydroperoxide, ketone peroxides such as methyl ethyl ketone peroxide are preferably used. The amount used is preferably about 0.01 to 10% by weight.

The polymerization initiator is preferably added immediately before actually performing the adhesive sealing operation. For this reason, the adhesive sealing material is made into a two-component type containing a curable component and a component containing the polymerization initiator. Is preferred.

[0016]

In the present invention, vapor-phase process aluminum oxide is considered to have a function of forming a hydrogen bridge bond in the resin and improving the thixotropic property.

[0017]

【Example】

Example 1 The following materials were mixed to form a composition A. PMMA 15.4 wt% Methyl methacrylate 30.0 〃 Methacrylic acid 1.0 〃 Aluminum hydroxide 46.5 〃 Gas phase method aluminum oxide 7.0 〃 Dimethyl paratoluidine 0.1 〃 Polymerization to 100 g of this composition A 0.2 g of benzoyl peroxide was mixed as an initiator to prepare an adhesive sealing material.

With respect to this adhesive sealing material, the viscosity at 2 rpm and the viscosity at 20 rpm were measured with a B type viscometer to determine the thixotropic index. JIS-K68
According to No. 49, the tensile peel strength was determined using acrylic artificial marble as the adherend. Table 1 shows each measurement result.

As shown in FIG.
The sheets were applied to the corners of the artificial marble plate 1 which was laminated vertically, and the excess sealing material was removed while rounding about 5 mmR with a polyethylene spatula to form the adhesive sealing material corners 2. If left as it was in room temperature air, the curing was almost completed after 1 hour. The cured adhesive seal had the same texture as artificial marble.

Example 2 Composition B was prepared by mixing the following materials. PMMA 21.85% by weight Methyl methacrylate 44.5〃 Titanium oxide 2.0〃 Aluminum hydroxide 25.5〃 Gas phase method aluminum oxide 4.5〃Vanadium acetylacetonate 0.02〃 (Kakuyaku Akzo; Acceleleter VN2 ) Aluminum acetylacetonate 0.33 〃 dibutylthiourea 1.3 〃 100 g of this composition B was mixed with 3.7 g of cumene hydroperoxide as a polymerization initiator to prepare an adhesive sealant.

The results of evaluation of this adhesive seal material in the same manner as in Example 1 are shown in Table 1. Further, as in the first embodiment,
The same effect was obtained when the two pieces were applied to the corners of the artificial marble plates that were vertically stuck together.

Comparative Examples 1 and 2 Adhesive sealing materials were prepared in the same manner as in Examples 1 and 2, except that vapor phase aluminum oxide was not used. The characteristics are shown in Table 1. Similar to Example 1, two pieces were applied vertically to the corners of an artificial marble plate, but the viscosity was not sufficient and a roundness of 5 mmR could not be formed.

[0023]

[Table 1]

[0024]

Since the adhesive sealing material of the present invention has a high thixotropic property, it is possible to easily form a corner portion having a large radius of curvature. In addition, there is also an advantage that the entrainment of air bubbles that impair the appearance of the string and the cured product is small.

[Brief description of drawings]

FIG. 1 is an explanatory view of a corner portion of the artificial marble of Example 1.

FIG. 2 is an explanatory view of a corner portion of a conventional artificial marble.

[Explanation of symbols]

 1: Artificial marble board 2: Adhesive sealing material corner section 3: Artificial marble board 4: Artificial marble member 5: Adhesive sealing material corner section

Claims (3)

[Claims] 1. A mixture of a curable resin component mainly composed of methyl methacrylate and a polymer thereof and an inorganic filler, wherein 1 to 10 of aluminum oxide obtained by a gas phase synthesis method is used.
Adhesive sealing material containing wt%. 2. The adhesive sealing material according to claim 1, which has a thixotropic index of 5 to 20. 3. The adhesive sealing material according to claim 1, which is a two-liquid type.