JP2813389B2 - Molded body - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a marble, a granite and other molded articles having a stone-like appearance widely used for furniture, furniture, building materials and the like.

[Conventional technology and its problems]

There are many examples of disclosure of artificial marble containing an acrylate resin containing a metal hydroxide such as aluminum hydroxide or an inorganic filler such as calcium carbonate, quartz or talc (for example, JP-A-61-58851, JP-A-61-141653, JP-A-61-141654, JP-A-62-1289
No. 56).

These fillers are added to obtain a quartz appearance or to impart flame retardancy, but the stone texture is still insufficient, and the bonding between the acrylate resin binder and these inorganic fillers is not sufficient. Is not sufficient, and it is difficult to obtain the expected mechanical strength and hardness, or the flame retardancy is not sufficiently imparted, or there is a problem that the antifouling property is inferior. is not.

The present invention solves these problems, and provides a stone-like shaped body such as quartz schist, marble, granite, etc., which is excellent in mechanical strength such as hardness and impact strength and is rich in pure white semi-transparent stone texture. is there.

[Means for solving the problem]

The present invention is based on a total of 100% by weight of an acrylate resin binder and a metal hydroxide filler.
% Or more, and preferably, the fluorine-containing resin is polytetrafluoroethylene, and at least one selected from silica powder, silica-alumina-based powder, mica powder, and silica-based glass powder. Further, it is added and dispersed.

In the present invention, the acrylate resin binder refers to a resin such as ethyl acrylate or methyl methacrylate, or a resin obtained by copolymerizing a resin such as polyethylene, polyester, or epoxy. The metal hydroxide filler refers to aluminum hydroxide, magnesium hydroxide value, aluminum calcium hydroxide, etc., having a particle size of 1 μm to more than 10 μm.
m.

The fluorine-containing resin is well bonded to acrylate resins such as polytetrafluoroethylene, ethylene tetrafluoride-propylene hexafluoride copolymer, ethylene-tetrafluoroethylene copolymer, ethylene tetrafluoride-perfluoroalkyl vinyl ether copolymer, and Shore D Hardness is around 60 or more and melting point is around 300 ° C or more.

Metal hydroxide filler is 50-70wt% in total of 100wt% of metal hydroxide filler and acrylate resin binder
Let it be included.

The metal hydroxide bonds well with the acrylate resin,
It imparts a certain degree of robustness to the molded article, evaporates water when it comes into contact with a flame, prevents the temperature from rising due to its endothermic effect, and imparts flame retardancy. If the acrylate resin is too large, the amount of the acrylate-based resin as the binder becomes relatively small, and the binding action of the acrylate-based resin does not sufficiently reach each filler particle, and the strength and hardness are rather deteriorated.

The fluorinated resin has relatively high hardness and flame retardancy, has a strong bond with an acrylic resin binder, increases the mechanical strength and hardness of the molded body, has excellent antifouling properties, and is semi-transparent. To give the molded article a semi-white semi-transparent property, that is, a deep appearance.

If the fluorine-containing resin is not added in an amount of 1% by weight or more based on 100% by weight of the binder and the filler, the above-mentioned effect is not exhibited. Rather, it is more likely that the molded body will be brittle, and it is expensive in itself and raises the raw material cost, so that it is preferably 1 to 10% by weight, more preferably 3 to 5% by weight.

Among the fluororesins, polytetrafluoroethylene is advantageous in that it is inexpensive and easily available.

The particle size of the fluorine-containing resin may be several μm to several tens μm, and may be such that the particle size is not visually recognized.

Further, in order to obtain a desired pattern, silica such as quartz,
Silica alumina such as sillimanite, clay, mica,
Granular, flaky, or fibrous additives such as silica-based glass, such as soda-quartz glass, may be extrapolated and mixed within a range of several wt% to a total of 100 wt% of the binder and filler.

In addition, the said molded object can be made into plate shape, laminated | stacked and integrated with a foamed vitreous body, cellular concrete, and a lightweight aggregate aggregate, and can also provide heat insulation and other characteristics.

〔Example〕

Polymethyl methacrylate or polyethyl methacrylate, aluminum hydroxide having an average particle size of 5 to 10 μm,
Magnesium hydroxide or calcium aluminum hydroxide is kneaded, and polytetrafluoroethylene, ethylene tetrafluoride-propylene hexafluoride copolymer, ethylene-tetrafluoroethylene copolymer or ethylene tetrafluoride having an average particle size of 5 to 20 μm -Add a perfluoroalkyl ether copolymer, add a small amount of an azo compound as a polymerization initiator, knead it, pour it into a mold, hold it at 50 ° C or lower, cure it, then remove the frame and mix various raw materials A plate-shaped specimen was obtained in a proportion. Table 1 shows the raw material mixing ratios of the test specimens. In Comparative Example 3, the particle size was about 10
μm of talc was mixed.

In the molding, it is preferable that the mixed resin liquid has an appropriate fluidity and that the bubbles are removed easily. The moldability was determined by visual observation and feel during casting, and the results are shown in Table 1. In Comparative Example 2, the subsequent test was stopped because the fluidity of the mixed resin liquid was poor and molding was difficult.

The obtained test specimens were classified into three ranks of good, acceptable, and bad by observing the appearance, as to whether or not they exhibited a so-called deep marble tone with a slight translucency, as shown in Table 1. .

On the other hand, a flame resistance test was performed by applying a flame of a lighter from the surface end to the edge of the specimen for 30 seconds, and brown discoloration was observed at the relevant portion, and slight peeling was observed at the edge, but the overall good condition was observed. The results are shown in Table 1 below. The results are shown in Table 1 (good), slightly inferior (good), discolored to blackish brown, resulting in swelling-like projections, and markedly exfoliated at the edges (impossible). . However, in any case, self-burning did not occur.

In the antifouling test in which a felt marker is partially applied, dried, and then washed with water, the result is classified into those with little traces (good), those with slight traces (acceptable), and those with marked traces (impossible). It is shown in the table.

In addition, the Shore D hardness was determined by a hardness tester, and the Izod impact strength of a test piece with a predetermined notch was determined by an impact tester. The results are shown in the graph of FIG.

The results are clear from Table 1 and FIG. 1, and it is clear that the present invention is good in any of the tests.

[Effects of the Invention] According to the present invention, the hardness of the molded body, the impact strength is increased,
Flame retardancy, antifouling properties, etc. can also be improved, and the effect of obtaining a deep stone texture can be obtained.
It is suitable as a material for furniture and the like.

[Brief description of the drawings]

FIG. 1 is a graph comparing the hardness and the impact strength of the compact.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ identification symbol FI C08K 3/40 C08K 3/40 // (C08L 33/04 27:18) (58) Fields surveyed (Int.Cl. ⁶ , (DB name) C08L 33/04 C08L 27/18 C08K 3/22 C08K 3/34 C08K 3/40 C04B 26/06 C04B 26/08

Claims (3)

(57) [Claims] 1. A fluororesin is used in an amount of 1 to 10 watts based on a total of 100 wt% of an acrylate resin binder and a metal hydroxide filler.
A molded article characterized by being added and dispersed by t%. 2. The molded article according to claim 1, wherein the fluororesin is polytetrafluoroethylene. 3. The method according to claim 1, wherein at least one selected from silica powder, silica alumina powder, mica powder and silica glass powder is further added and dispersed.
The molded article according to the above.