KR20040058769A - Composition for Artificial Marble Having Superior Anti-Cracking Property - Google Patents

Abstract

PURPOSE: A composition for an artificial marble plate is provided to improve binding property between an inorganic filler and an acryl resin, ductility of the polymer resin and crack resistance in a wide range of temperature condition, by adding a functional monomer. CONSTITUTION: The composition for an artificial marble plate comprises: (A) 100pts.wt of an acryl resin; (B) 0.5-3pts.wt of a functional monomer having a hydroxyalkyl chain, represented by a general formula 1: wherein R1 is CH2CH2 or CH2CH(CH3); R2 is H or CH3; and n is 2-6; (C) 100-200pts.wt of an inorganic filler; and (D) 0.5-5pts.wt of a crosslinking agent. The functional monomer is selected from a hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxyethyl methacrylate and hydroxypropyl methacrylate.

Description

Composition for Artificial Marble Having Superior Anti-Cracking Property}

Field of invention

The present invention relates to a composition for artificial marble plate material excellent in crack resistance. More specifically, the present invention relates to a composition for artificial marble sheet having excellent crack resistance, including a functional monomer having an hydroxy alkyl chain including an acrylic resin and a hydroxyl functional group in a molecular structure, an inorganic filler, and a crosslinking agent.

Background of the Invention

Generally, artificial marble plate is prepared by dissolving a small amount of organic peroxide and azo compound as an initiator for radical polymerization in a syrup mixed with an acrylic resin, an inorganic filler and various dyes, and then curing it in the form of a plate. Or it is widely used as a top plate material, such as a table or various counters.

However, when artificial marble is used as the top of the kitchen sink, heating and cooling are repeated by various hot air balloons such as a gas stove, which causes deformation and cracks during use.

In order to solve this problem, Japanese Patent Laid-Open No. 6-147993 discloses a method of manufacturing an artificial marble sheet by adding urethane methacrylate to an acrylic resin syrup.

In addition, Japanese Patent Laid-Open No. 3-45542 discloses a method of treating and applying an inorganic filler surface with a silane coupling agent (Japanese Patent Laid-Open No. 3-45542).

However, these methods have the drawback that the manufacturing process is complicated and the manufacturing cost is increased because a separate process must be added.

Cracks due to repeated heat-cooling occur because the interfacial bonding force between the inorganic filler and the acrylic resin is relatively weak, and is also due to the lack of ductility of the acrylic resin polymer bonded to the inorganic filler. Therefore, by increasing the interfacial bonding force and improving the ductility of the resin molecules bonded to the inorganic filler, ultimately, crack resistance of the artificial marble plate can be improved.

In the present invention, in order to solve the above problems, by adding a functional monomer having a hydroxy alkyl chain containing a hydroxyl functional group in the molecular structure to a resin syrup composed of an acrylic resin and an inorganic filler, the bonding strength between the inorganic filler and the acrylic resin and the resin polymer Increasing the ductility of the artificial resin plate resin composition has improved crack resistance.

An object of the present invention is to provide a resin composition for artificial marble plate material with improved interfacial bonding force between the inorganic filler and the acrylic resin.

Another object of the present invention is to provide a resin composition for artificial marble plate material improved ductility of the acrylic resin polymer coupled to the inorganic filler.

Still another object of the present invention is to provide a resin composition for artificial marble sheet having excellent crack resistance even in an environment where high temperature and low temperature are repeated.

The above and other objects of the present invention can be achieved by the following description. Hereinafter, the content of the present invention will be described in detail.

The resin composition for artificial marble sheet of the present invention includes (A) an acrylic resin, (B) a functional monomer having a hydroxy alkyl chain including a hydroxyl functional group, (C) an inorganic filler, and (D) a crosslinking agent. Detailed description of each of these components is as follows.

(A) acrylic resin

The acrylic resin is selected from the group consisting of methacrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and 2-ethylhexyl methacrylate. It is a resin syrup in which the acrylic polymer which is these polymerization products is melt | dissolved in the acryl-type monomer to become. The resin syrup is prepared in a weight ratio of 65-85 wt% acrylic monomer content and 15-35 wt% acrylic polymer content.

(B) functional monomers having hydroxy alkyl chains containing hydroxyl functional groups

Functional monomer having a hydroxy alkyl chain containing a hydroxyl functional group of the present invention is represented by the following formula (1).

[Formula 1]

Wherein R ₁ is CH ₂ CH ₂ or CH ₂ CH (CH ₃ ); R ₂ is H or CH ₃ ; n is 2 ≦ n ≦ 6

Specific examples of the functional monomer having a hydroxy alkyl chain including the hydroxyl functional group are selected from the group consisting of hydroxy ethyl acrylate, hydroxy propyl acrylate, hydroxy ethyl methacrylate, and hydroxy propyl methacrylate.

Functional monomers containing a hydroxyl functional group of the present invention and having a polyalkylene chain form bonds to the inorganic filler and the acrylic resin, respectively, thereby increasing the interfacial bonding force and increasing the resin ductility due to the polyalkylene chain in the molecular structure. It is thought that crack resistance improves.

In particular, these compounds, unlike conventional silane coupling agents and the like, show an excellent effect simply by being added to a resin syrup and used.

The functional monomer is preferably added to 0.5 to 3 parts by weight based on the entire resin syrup. When added in excess of 3 parts by weight, the deformation becomes severe at the time of preparation, and when added in less than 0.5 parts by weight, no addition effect is exhibited.

(C) inorganic filler

The inorganic filler used in the present invention uses aluminum hydroxide having an average particle size of 5-80 μm. In order to show the characteristic translucent characteristic of an artificial marble, it is preferable to use in 100-200 weight part with respect to 100 weight part of acrylic resin syrup mentioned above.

(D) crosslinking agent

The crosslinking agent used in the present invention is a multifunctional monomer containing 2-3 double bonds in a molecule such as ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, triethylene glycol dimethacrylate, and the like. It is added in the range of 0.5 to 5 parts by weight based on the entire resin.

(E) polymerization initiator

As the polymerization initiator, peroxides such as benzoyl peroxide, lauroyl peroxide, butyl hydroperoxide, cumyl hydroperoxide, or azo compounds such as azobisisobutylonitrile are used. In this invention, it is preferable to use a polymerization initiator 0.1-3 weight part with respect to an acrylic resin.

The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

Example 1

40 g of hydroxyethyl methacrylate was added to 2 kg of a resin syrup in which polymethyl methacrylate was dissolved in methyl methacrylate by 21% by weight, and the mixture was sufficiently stirred and dissolved. 12 g of oxide was dissolved. Subsequently, 3 kg of aluminum hydroxide having an average particle size of 40 microns was added thereto, followed by stirring to disperse uniformly.

The above uniformly dispersed mixture was bubbled by vacuum for 20 minutes, then cast into a glass mold having a size of 600 mm x 300 mm x 15 mm and cured in a 90 ° C hot air oven.

After the curing reaction was completed to cool to room temperature to prepare a physical specimen.

Example 2

Specimens were prepared in the same manner as in Example 1 except that 40 g of hydroxy propyl methacrylate was added instead of hydroxy ethyl methacrylate.

Example 3

Specimens were prepared in the same manner as in Example 1 except that 40 g of hydroxy propyl acrylate was added instead of hydroxy ethyl methacrylate.

Comparative Example 1

A specimen was prepared in the same manner as in Example 1 except that 40 g of methyl methacrylate monomer was further added without adding hydroxy ethyl methacrylate.

Comparative Example 2

A specimen was prepared in the same manner as in Example 1 except that 6 g of hydroxyethyl methacrylate was added.

The crack resistance of the specimens prepared in Examples and Comparative Examples was evaluated, and the results are shown in Table 1. Crack resistance was evaluated by the following method.

※ Crack resistance evaluation method: make a 100mm × 100mm square hole in the center of the specimen and heat and cool it only by using an infrared heater repeatedly for 2 hours. Repeat until cracks occurred at one edge. However, at the time of heating, when the temperature of 1 cm away from one side of the square hole reached 95 degreeC, this temperature was hold | maintained. Crack resistance was measured by the number of heat-cooling repetitions before cracking occurred.

Example Comparative Example One 2 3 One 2 (A) acrylic resin 100 100 100 100 100 (B) Hydroxyethyl methacrylate 2 - - - 0.3 Hydroxypropyl methacrylate - 2 - - - Hydroxy propyl acrylate - - 2 - - (C) inorganic filler 150 150 150 150 150 (D) crosslinking agent 3 3 3 3 3 Crack resistance 54 64 60 8 10

From the results in Table 1 above, it was found that when hydroxy alkyl acrylate or hydroxy alkyl methacrylate was added to the resin syrup, crack resistance due to repeated heating and cooling was significantly improved.

The present invention adds a functional monomer having a hydroxy alkyl chain containing a hydroxyl functional group in a molecular structure to a resin syrup composed of an acrylic resin and an inorganic filler, thereby increasing the bonding strength between the inorganic filler and the acrylic resin and the ductility of the resin polymer to increase the crack resistance. This invention has the effect of providing the improved resin composition for artificial marble sheet.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be seen to be included in the scope of the present invention.

Claims (6)

(A) 100 parts by weight of acrylic resin; (B) 0.5 to 3 parts by weight of a functional monomer having a hydroxy alkyl chain containing a hydroxyl functional group represented by the following formula (1) in its molecular structure; [Formula 1] Wherein R ₁ is CH ₂ CH ₂ or CH ₂ CH (CH ₃ ); R ₂ is H or CH ₃ ; n is 2 ≦ n ≦ 6 (C) 100 to 200 parts by weight of the inorganic filler; And (D) 0.5 to 5 parts by weight of crosslinking agent; Composition for artificial marble plate material comprising a. The method of claim 1, wherein the acrylic resin (A) is methacrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate and 2-ethyl A resin syrup in which an acrylic polymer of these polymers is dissolved in an acrylic monomer selected from the group consisting of hexyl methacrylate, wherein the acrylic monomer content is 65-85% by weight and the acrylic polymer content is 15-35% by weight. Composition for artificial marble plate. The artificial marble according to claim 1, wherein the functional monomer (B) is selected from the group consisting of hydroxy ethyl acrylate, hydroxy propyl acrylate, hydroxy ethyl methacrylate, and hydroxy propyl methacrylate. Plate composition. The composition for artificial marble plate according to claim 1, wherein the inorganic filler (C) is aluminum hydroxide having an average particle size of 5-80 μm. The synthetic agent according to claim 1, wherein the crosslinking agent (D) is selected from the group consisting of ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, and triethylene glycol dimethacrylate. Composition for marble plate. Artificial marble plate produced using the composition of claim 1.