JPS60127334A - Filler for synthetic resin molded article - Google Patents

Abstract

PURPOSE:To provide titled filler capable of giving outstanding transparent appearance when incorporated in thermosetting resins, furthermore capable of keeping transparency for a long time by subjecting its surface to silane treatment, constituted by specific composition of glass. CONSTITUTION:The objective filler with a refractive index 1.45-1.65 consisting of (A) 45-70wt% of SiO2, (B) 5-15wt% of R2O (R is alkali metal), (C) 15- 35wt% of MO (M is alkaline earth metal) and (D) 0-10wt% of Al2O3. Furthermore, the surface of said filler (glass) is subjected to silane treatment by impregnating the filler with aqueous and/or organic solvent solution(s) containing 0.5-50 (pref. 0.7-10)wt% of silicon compound followed by drying the resultant filler. Said filler (glass) is virtually identical in the refractive index with those of various synthetic resins; therefore, capable of giving extremely good transparent appearance when incorporated in molded articles.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a filler particularly useful for use in transparent synthetic resin molded articles.

Conventionally, glass fillers have been mixed into synthetic resin molded articles to improve mechanical strength, water resistance, and corrosion resistance. From a design point of view, it is desirable to impart transparency to such thermosetting resin molded articles.

As described above, the present invention aims to provide a thermosetting resin molded article with a desired transparency and to maintain this transparency over a long period of time.To achieve the above objects, the present inventors and others As a result of extensive research, they found that a filler made of glass with the following composition was the most suitable.

5iOz 45-70% by weight (hereinafter simply referred to as "Q") Bz
os 0-9,91 R205-15 1 MO15-35 1 Ajzoa 0-10 1 Here, R is an alkali metal, R20 may be one or a mixture of two or more alkali metal oxides, and MO is an alkaline earth metal, and MO may be a mixture of one or more alkaline earth metal oxides. Glass having the above composition range has a refractive index in the range of 1.45 to 1.65. For example, polyester resin has a refractive index of 1.52 to 1.57.7, acrylic resin has a refractive index of 1.48 to 1.57, and epoxy resin has a refractive index of 1.
．． The refractive index of 6L phenol resin is 1.5 to 1.58, the refractive index of urea resin is 1.54 to 1.56, and the refractive index of polycarbonate is 1.586. Refractive index of polystyrene l, 59-1
．． 60, refractive index of polyethylene 154, refractive index of polypropylene 1.49, refractive index of polyacetal 1.48,
It has a refractive index of 1.53, etc. of nylon, and is very similar to that of nylon, and when mixed into molded products made of these synthetic resins, it gives extremely good transparency.

The filler of the present invention may be provided in any form such as powder, fiber, flake, etc. In the case of fiber, it may be in the form of a non-woven fabric or a knitted fabric.

As mentioned above, the filler of the present invention is added to a synthetic resin molded product to give it an extremely good transparency, but in order to maintain the transparency, the glass surface of the above composition must be further treated with silane. It is necessary to use a filler material that is The silane treatment refers to treatment of the glass surface with a silicon compound such as a silane coupling agent, silicone resin, or organopolysiloxane. For the blade body, the silane treatment is performed by immersing the glass in a water and/or organic solvent solution of 0.5 to 50%, preferably 0.7 to 10%, of a silicon compound such as those exemplified above, and then heating the glass at room temperature. This is carried out by drying or, if desired, by heat treatment at a temperature of about 150 to 250°C. In this way, silane treatment strengthens the bond between the synthetic resin and glass, eliminates factors that impede transparency, such as whitening caused by peeling between synthetic resin and glass, and maintains transparency over a long period of time. can be maintained.

As described above, according to the present invention, the refractive index of the glass having the above-mentioned composition is substantially the same as that of various synthetic resins, and therefore, when added to molded products as a filler, an extremely excellent transparency can be obtained. Glass with the above composition also has excellent hot water resistance, cold resistance, and chemical resistance, making it suitable for kitchen counters,
The Company provides synthetic resin molded products useful for bathtubs, washstands, sinks, wall materials, floor materials, etc.

Example 1 0Si0z 58 using glass powder with the following composition as a filler
B2O37 # NazOB # 20 1 # Ca0 26 # The refractive index of the above filler is 1,55.

300 g of the above filler is mixed with 700 g of a 1-1 mixture of unsaturated polyester and styrene monomers, and 0.5 g of methyl ethyl ketone hydroperoxide is further added to the mixture, followed by vacuum defoaming and kneading. The mixture is poured into a predetermined mold and heated at 70° C. for 3 hours to obtain a molded product with good transparency.

Example 2 Create a glass cloth using glass fibers with the following composition0 Si0z 53 Chi B2O39N Na2Q 7.

K2O3# CaO271 A120s 2 tt The refractive index of the glass cloth is 1.57.

The above glass cloth was impregnated with a 5% toluene solution of vinyltrimethoxysisine as a silane coupling agent, and after impregnation, it was air-dried for 10 minutes and then heated at 100° C. for 5 minutes. A molded article is molded using the synthetic resin raw material of Example 1 using the silane-treated glass cloth in a mold by the /%2 dry-up method. The molded product has good transparency, and the transparency is determined by soaking the molded product in hot water at 80°C for 400 minutes.
Retains even after soaking for hours.

Example 3 Glass pieces with the following composition are used.

5i0248% B20! 10 # Na2O10# 20 3 # Ca0 20s A/203 9 # The refractive index of the glass piece is 1,53.

The above glass pieces were immersed in silicone oil (organopolysiloxane: KF-96 manufactured by Shin-Etsu Chemical Co., Ltd.), and after immersion
Heat treatment is performed at ℃ for 10 minutes. The filler 40Of thus obtained is mixed with a melt of polyethylene 600f and pelletized using a pelletizer to obtain a molding compound. The compound can be molded into a molded article with good transparency by injection molding, extrusion molding, or the like.

Example 4 A molded article with good transparency was obtained in the same manner as in Example 1 except that the glass powder of Example 1 was replaced with a glass powder having the following composition as a filler.

5in265% B2O35y Na2Q 7.

K2O21 Ca0 12 # Zn0 9 # The refractive index of the glass powder is 1.58.

Example 5 A glass cloth was made using glass fibers having the following composition in place of the glass fibers in Example 2, and a molded product with good transparency was obtained in the same manner as in Example 2. 2' CaO14t A/zo37 #ZnO394 The refractive index of the above glass cloth is 1.56.

Example 6 A molded article with good transparency was obtained in the same manner as in Example 3 except that glass pieces having the following composition were used in place of the glass pieces of Example 3.

Sing 60% 820s 3 # Nazo 9t Ca0 25 # Zn0 2 # Mg0　1　z The refractive index of the glass piece is 1.55.

Patent applicant: Nippon 7Rits Co., Ltd. Ina Seito Co., Ltd. Nippon Insulator Co., Ltd.

Claims (2)

[Claims] (1) 5i0z 45-70 weight beast B2O30-9.
9% by weight, R2O 5-15% by weight (R is an alkali metal), MO 15-35% by weight (M is an alkaline earth metal), AhOs 0-10% by weight. Filler for synthetic resin molded products (2) 5i0z 40-65 weight 96, BzOa 0
-10% by weight, R2015-35% by weight, R is an alkali metal), MO5-15% by weight, M is an alkaline earth metal), A/20110-10% by weight. Filler for synthetic resin molded products with 7-run treatment on the surface