JP2002137949A - Resin composition for artificial marble and formed body for waterworks - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin composition for an artificial marble in which a crack and loss of a gloss are not caused after a long period even in an environmental condition in contact with hot water, and its formed body. SOLUTION: The resin composition for the artificial marble comprises a matrix resin and a filler whose surface is coated with a silane coupling agent and a metal alkoxide compound.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention provides a resin composition for artificial marble having excellent hot water impact resistance and a molded article thereof.

[0002]

2. Description of the Related Art In recent years, artificial marble has a high-grade appearance, and is used for daily necessities, especially bathtubs, vanities,
Widely used for water-related products such as wash counters and kitchen counters. In these artificial marble molded products, fillers are often blended for the purpose of improving performance such as strength and hardness and reducing costs. However, simply blending the filler into the resin matrix,
While the above performance and the like are exhibited, adhesion at the interface between the filler and the resin matrix often poses a problem. Therefore,
Conventionally, fillers have been treated with a coupling agent that has been variously modified according to the type of resin to give the filler and the resin adhesion. Generally, a silane coupling agent has been used in terms of coupling performance and ease of handling.

[0003]

However, in the case of a plumbing product, for example, a large hot water impact may be applied as in a bathtub at the time of reheating. In this case, if heating and cooling are repeated due to the difference in thermal shrinkage between the resin and the filler, the stress applied to the interface is further increased. Therefore, when the treatment is performed using only the silane coupling agent, cracks may occur during long-term use, which may cause problems such as cracks and loss of gloss.

Accordingly, an object of the present invention is to provide a resin composition for artificial marble which does not cause problems such as cracking and loss of gloss for a long period of time even in an environment where it is exposed to hot water, and a molded article thereof.

[0005]

According to the present invention, there is provided a resin composition for artificial marble comprising a matrix resin and a filler, wherein a silane coupling is provided on the surface of the filler. And a resin composition for artificial marble characterized by being coated with an agent and an alkoxide metal compound. Since the surface of the filler is coated with a highly reactive alkoxide metal compound together with the silane coupling agent, problems such as cracking and loss of gloss do not occur for a long time even in an environment where hot water is exposed. It is considered that the introduction of a highly reactive alkoxide metal compound quickly and firmly forms a film on the surface of the filler, thereby strengthening the bond with the resin.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, as a resin serving as a matrix, general resins used as artificial marble resins can be used, and examples thereof include unsaturated polyester resins, vinyl ester resins, acrylic resins, epoxy resins and the like. .

The filler can be selected according to the performance to be imparted to the resin, and examples thereof include alumina, silica, aluminum hydroxide, calcium carbonate, clay, and glass. The compounding amount, the particle size, etc. can also be used in the range generally used.

The silane coupling agent used includes:
The choice is made in consideration of compatibility with the resin. γ-aminopropyltriethoxysilane, vinyltriethoxysilane, vinyltris (β-methoxyethoxy) silane, γ-methacryloxypropyltrimethoxysilane, β- (3,4-
Epoxycyclohexyl) ethyltrimethoxysilane,
One or more of various silane coupling agents such as γ-glycidoxypropyltrimethoxysilane, γ-mercaptopropyltrimethoxysilane, and γ-isocyanatopropyltriethoxysilane are exemplified.

The alkoxide metal compound blended with the silane coupling agent is Ti (OC ₃ H ₇ ) ₄ ,
Ti (OC ₄ H ₉ ) ₄ , Ti (OC ₈ H ₁₇ ) ₄ , Ti (OC
_{H 3) 4, (OC 3} H 7) 2 Ti (C 5 H 7 O 2) 2, Ti (C 5
Alkoxide titanium compounds such as H ₇ O) ₄ , Ti is Zr,
Examples include at least one of various types such as alkoxide zirconia compounds substituted with Hf, Sb, and Pb, and composite alkoxides thereof, or alkoxides of Mg and Al.

As a processing method, any method such as a dry method, a wet method, and an integral method may be used. On the other hand, if the addition amount is too small, the surface of the filler cannot be sufficiently subjected to the coupling treatment, so that the adhesion to the resin cannot be improved, and as described above, adverse effects occur. If the amount is too large, the viscosity increases during casting and the curing characteristics change, and further, the physical properties of the cured product decrease. Although it depends on the processing efficiency and the surface area of the filler, the silane coupling agent is preferably 0.1 to 3% by weight of the filler, and the alkoxide metal compound is preferably 0.1 to 5% by weight of the coupling agent.

[0011] In addition, an ultraviolet absorber, a low-shrinking agent, an anti-settling agent, an internal release agent, a pigment,
And various other additives.

By molding the above resin composition, various molded articles of artificial marble can be obtained. The molding method is
A casting method, a pressing method, or the like is selected according to the production amount and the moldability. Since it is excellent in hot water resistance, it can be applied to a water circulating member such as a bathtub, a dressing table, a wash counter, a kitchen counter, and the like to obtain a molded article having excellent characteristics without change in appearance due to use of hot water.

[0013]

The present invention will be described in detail below with reference to an example in which aluminum hydroxide is mixed with an epoxy resin, but the present invention is not limited to this.

Example Resin formulation: 100 parts of epoxy resin, acid anhydride curing agent 9
0 parts, 8 parts of curing accelerator, 300 parts of filler described below. Filler treatment: 1% by weight of a silane coupling agent and 0.03% by weight of zirconia tetra n-butoxide are diluted three-fold with a solvent of water: ethanol 1: 9, sprayed onto aluminum hydroxide while stirring, and heated to 130 ° C. For 1 hour. Cast with the above composition, after curing at 60 ° C for 90 minutes, 130
After-curing at 60 ° C. for 60 minutes, a molded plate sample having a thickness of 7 mm was prepared, and the thermal shock resistance was evaluated.

Heat-resistant water impact test: A sample was immersed in hot water at 85 ° C. and cold water at 15 ° C. for 2 minutes as one cycle, and the surface gloss of the sample was measured when this was repeated (Nippon Denshoku Industries Co., Ltd.) Σ80color measuring syste
m), the gloss retention was calculated, and the gloss retention after 4000 cycles was considered to be 50% or more.

Comparative Example 1 Aluminum hydroxide without surface treatment was blended, molded and evaluated in the same manner as in the examples.

Comparative Example 2 Using only aluminum hydroxide to which only 1% by weight of a silane coupling agent was applied by a dry method, compounding, molding, and evaluation were performed in the same manner as in the examples.

Table 1 and FIG. 1 show the results of the hot water shock test for the Examples, Comparative Examples 1 and 2.

[0019]

[Table 1]

From the results shown in Table 1 and FIG. 1, it can be seen that the treatment with the silane coupling agent alone can solve the problem by adding a small amount of the alkoxide metal compound even in cases where the required performance is limited.

[0021]

According to the present invention, it is possible to provide a resin composition for artificial marble and a molded product thereof, which do not cause problems such as cracking and loss of gloss for a long time even in an environment where hot water is exposed. Become.

[Brief description of the drawings]

FIG. 1 is a view showing the results of a hot water shock test in an example of the present invention.

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) C08K 9/06 C08K 9/06 C08L 101/00 C08L 101/00 // (C04B 26/14 (C04B 26/14 24: 02 24:02 24:40 24:40 14:36) 14:36) 103: 63 103: 63 111: 54 111: 54 F term (reference) 4F071 AA42 AB18 AC05 AC16 AE17 AE20 AH03 BB01 BC03 4G012 LA13 LA14 4J002 BG001 CD001 CD201 CF211 DE146 DE236 DJ016 DJ036 DL006 FB106 FB136 FB146 FB166 FD016 GL02

Claims (4)

[Claims] 1. An artificial marble resin composition comprising a matrix resin and a filler, wherein the surface of the filler is coated with a silane coupling agent and an alkoxide metal compound. Resin composition for artificial marble. 2. The artificial marble resin composition according to claim 1, wherein the alkoxide metal compound is a titanium alkoxide or a zirconium alkoxide. 3. The addition amount of the silane coupling agent is 0.1 to 3 wt% with respect to the filler, and the alkoxide metal compound is 0.1 to 5 wt% with respect to the silane coupling agent.
%. The resin composition for artificial marble according to claim 1 or 2, wherein 4. A molded body for water circulation, which is molded using the resin composition for artificial marble according to claim 1.