KR19980053380A - Manufacturing method of artificial marble plate with improved heat resistance - Google Patents

Abstract

The present invention relates to a method for producing a heat-resistant artificial marble plate composed of an acrylic resin and an inorganic filler, in the production of artificial marble using an acrylic resin syrup and an inorganic filler, a functional monomer having an acid or a hydroxyl functional group in the resin syrup It is characterized in that the addition, the artificial marble product obtained by the present invention can be used in a place using hot or hot water such as heating appliances or cooking utensils, it can be widely used as building interior materials.

Description

Manufacturing method of artificial marble plate with improved heat resistance

The present invention relates to a method of manufacturing an artificial marble plate composed of an acrylic resin and an inorganic filler, and more particularly, to a method of manufacturing an artificial marble plate having improved heat resistance.

Artificial marble plate has been widely used as a top plate material for various counters, kitchen furniture, wash basin, or table, and as the demand increases day by day, researches to improve the appearance and quality are also actively conducted. Among them, acrylic artificial marble is a method of mixing various additives with resin and inorganic filler, dissolving a small amount of organic peroxide or azo compound as an initiator for radical polymerization of acrylic monomer, and curing the final mixture into a plate at an appropriate temperature. It is common to manufacture.

In order for the manufactured product to be used for various purposes, the properties required in each case must be satisfied. Recently, as the use of artificial marble as a kitchen furniture has been expanded, the use of various hot air balloons, such as stoves, is increasing. As a general artificial marble, which is a resin composition manufactured by mixing a resin and an inorganic filler having different thermal expansion rates, It has a problem of lack of resistance to heat.

Due to this, first, there are problems that deformation or cracking occurs during use by repeated heating and cooling, and second, there is a problem that the surface gloss decreases or whitening occurs at the place where hot water is used. In order to solve these problems, a resin composition for a similar use is prepared by preparing a urethane methacrylate and adding it to an acrylic resin syrup (Japanese Patent No. Hei 6-147993, 1993), or by applying a silane coupling agent to the surface of an inorganic filler. (Japanese Patent No. Hei 3-45542, 1991) and the like are known, but in the manufacture of the resin composition, a separate process for this has to be added, which makes it difficult to apply, complicates the manufacturing process and increases the manufacturing cost. You still have problems.

The present invention is directed to producing artificial marble plates of excellent physical properties that can eliminate these limitations of the prior art and can be applied to a wider range. It is an object to provide a manufacturing method.

The production method of the present invention is characterized in that a functional monomer having an acid or a hydroxyl functional group is added to the resin syrup in the preparation of artificial marble using an acrylic resin syrup and an inorganic filler.

Hereinafter, the present invention will be described in detail.

Acrylic resins constituting the mixture of the present invention may be methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate or 2-ethylhexyl methacryl. It is a resin syrup in which the polyacrylate which is these polymers melt | dissolves in acrylic monomers, such as a rate. This resin syrup is preferably prepared in a weight ratio of 65-75 wt% acrylic monomer content and 25-35 wt% acrylic polymer content.

In this resin syrup, a polyfunctional monomer containing 2-3 double bonds in a molecule such as ethylene glycol dimethacrylate, trimethylolpropane trimethacrylate, allyl methacrylate, triethylene glycol dimethacrylate and the like is used as a crosslinking agent. 0.5-5% by weight of the total is added.

The change of the surface by heat or the occurrence of cracks due to repeated heat-cooling starts at the interface between the relatively weakly bonded resin and the inorganic filler. Therefore, the heat resistance of the product can be improved by the improvement of the interfacial bonding force.

To this end, in the present invention, a functional monomer containing an acid or a hydroxyl functional group such as acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl methacrylic acid, and the like may be used as a resin. Mix in syrup and use. It is thought that the above-described interfacial bonding strength is improved by forming a bond to each of these compounds in the resin and the inorganic filler, and in particular, these compounds, unlike conventional silane coupling agents and the like, have an excellent effect simply by adding them to the resin syrup. Indicates.

It is preferable to add 0.5-2.0 weight% of this functional monomer with respect to the whole resin syrup. This effect can be confirmed by a method such as surface change in boiling water or local heating-cooling at the cut portion as shown in the following examples. If it is less than this range, the additive effect is insufficient, and if it exceeds this range, there is no obvious increase in effect.

As the inorganic filler mixed with this resin, aluminum hydroxide having an average particle size of 5-50 microns is used. In order to show the characteristic translucency of artificial marble, the range of 100-200 parts by weight based on 100 parts by weight of the acrylic resin described above. Good to use at

Examples of the polymerization initiator include diacyl peroxides such as benzoyl peroxide and lauroyl peroxide, hydroperoxides such as butyl hydroperoxide and cumyl hydroperoxide, or azo compounds such as azobisisobutylonitrile. It is preferable to use 0.1-3% by weight with respect to.

Embodiments of the present invention are as follows.

Example 1

1) 8.0 g of ethylene glycol dimethacrylate and 6.0 g of 2-hydroxyethyl methacrylate were dissolved in 500 g of a resin syrup in which poly methyl methacrylate was 19% by weight dissolved in methyl methacrylate, and as a polymerization initiator therein. 3.0 g of benzoyl peroxide was dissolved.

2) Into the stirring vessel, the resin syrup and 1.080 g of aluminum hydroxide having an average particle size of 10 microns were added, stirred, and sprayed uniformly.

3) The mixture of the resin and aluminum hydroxide thus obtained was degassed in a vacuum for 10 minutes, and then cast into an aluminum mold having a size of 300 mm x 300 mm x 15 mm and cured in an 80 ° C hot air oven.

4) After 2 hours, the product was collected, cooled to room temperature, and evaluated for heat resistance by the following two methods, and the results are shown in Table 1 below.

end. In the center of the specimen, make a square hole of 100mm length and width and repeat heating and cooling only around the hole with an infrared heater, heating it for 1 hour and then cooling it for 2 hours so that a crack occurs at one corner of the hole. Repeat until. At this time, if the temperature of 1 cm away from the hole reaches 90 ℃ during heating, this temperature is maintained and then cooled.

I. Soak it in boiling water for 1 hour and remove it. Compare the surface gloss change with the color change before and after the test.

Comparative Example 1-3

The specimen preparation conditions of the following Comparative Examples are as follows, and the conditions other than the contents described below were performed in the same manner as in Example 1 above, and the results are shown in Table 1 below.

Comparative Example 1 2-hydroxyethyl methacrylate was not added to the resin syrup in Step 1) of Example 1 above.

Comparative Example 2 The same content of methacryloxy silane coupling agent was added to the resin syrup in step 1) of Example 1 instead of 2-hydroxyethyl methacrylate.

Comparative Example 3 The same content of dioctyl phosphate tantalum coupling agent was added to the resin syrup in step 1) of Example 1 instead of 2-hydroxyethyl methacrylate.

TABLE 1

* ΔL represents the change in L value (whiteness) before and after the experiment when the object's color is digitized in three-dimensional coordinates, namely L (white-black), a (red-green), and b (yellow-blue). The larger the value shown in the table, the more heavily whitened.

As mentioned above, when 2-hydroxyethyl methacrylate was used, the heat resistance such as resistance to repeated heating / cooling and color stability in boiling water was significantly improved. Simply adding it to the film showed an excellent effect unlike other coupling agents.

Example 2-4

In the same manner as in Example 1, the artificial marble plate was prepared and evaluated for heat resistance, but the content of the functional monomer was changed as shown in Table 2 below, and the results are also shown in Table 2 below.

[Comparative Example 4]

In the same manner as in Example 1, the artificial marble plate was prepared and evaluated for heat resistance, but the content of the functional monomer was changed as shown in Table 2 below, and the results are also shown in Table 2 below.

TABLE 2

As shown in Table 2, when the content of the functional monomer is 0.5% by weight or less, the effect was significantly reduced.

By increasing the bonding force between the resin and the filler by the manufacturing method of the present invention, an artificial marble plate having improved heat resistance can be obtained, and the artificial marble product obtained by the manufacturing method uses hot or hot water such as a heating appliance or a cooking appliance. It can be used in places and can be widely used as building interior materials.

Claims (3)

A method for producing an artificial marble plate having improved heat resistance, comprising adding a functional monomer having an acid or a hydroxyl functional group to a resin syrup in producing an artificial marble using an acrylic resin syrup and an inorganic filler. The method of claim 1, wherein the functional monomer is at least one member selected from acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxyethyl methacrylic acid. Manufacturing method of artificial marble plate with improved heat resistance. The method according to claim 1, wherein the amount of the functional monomer added is 0.5 to 2.0% by weight based on the entirety of the resin syrup.