JPH05247320A - Glass phenolic molding material - Google Patents

Abstract

PURPOSE:To obtain a phenolic molding material excellent in dimensional stability after treatment at a high temperature for a long period. CONSTITUTION:The objective glass phenolic molding material is obtained by blending 100 pts.wt. phenolic resin with 1-10 pts.wt. silicon polyphosphate in a glass phenolic molding material containing glass fiber and a filler.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a glass phenol molding material having excellent dimensional stability.

[0002]

2. Description of the Related Art The dimensional stability of a molded article can be considered in two stages, one depending on the processing method and processing conditions and the other depending on use conditions. The former depends on the mold, the type of molding material, and the molding conditions, and the latter depends on the ambient temperature and humidity conditions during use. The phenol molding material is a mixture of a resin, a filler, and other additives, and the dimensional stability also varies depending on the mixing ratio thereof due to the difference in the coefficient of thermal expansion. In the case of a thermosetting resin, it also shrinks as the curing reaction proceeds. These dimensional stability is one of the important properties for molded product properties, and has been studied by using resins, fillers, additives and the like.

[0003]

With respect to the glass phenol molding material, a high heat resistant material which can be used at high temperature for a long time has been developed, but it is still insufficient for the requirement of dimensional stability. Therefore, there is an urgent need to develop a glass phenol resin molding material which has good dimensional stability when used at high temperatures and has the same mechanical strength at room temperature and high temperature as compared with general glass phenol resin molding materials.

[0004]

The present invention has been made to solve the above-mentioned problems, and is characterized in that a phenol resin, glass fiber as a reinforcing material, silicon polyphosphate is used as a filler and an additive. The present invention provides a glass phenolic resin molding material.

The phenolic resin, glass fiber (chopped strand) as a reinforcing material and filler used in the present invention are generally used and are not particularly limited, and include calcium carbonate, aluminum hydroxide, silica and clay. Inorganic powder fillers such as glass powder can also be used together. In addition to the filler, a usual curing agent, auxiliary curing agent, release agent, other coloring agent, surface treatment agent, etc. can be added.

Here, silicon polyphosphate is a compound having a SiO ₂ component of 47 to 49% and a P ₂ O ₂ component of 48 to 50%, and is commercially available from Mizusawa Chemical Industry Co., Ltd. under the trade name of MIZUKAN EX300. . 1 to 10 parts by weight, and preferably 3 to 7 parts by weight of silicon polyphosphate are added to 100 parts by weight of the phenol resin. When the addition amount is 1 part by weight or less, the effect of dimensional stability is not observed, and when it is 10 parts by weight or more, the mechanical properties are deteriorated. These compounds are mixed, kneaded, pulverized, and, if necessary, granulated to obtain a glass phenol resin molding material.

[0007]

EXAMPLES The present invention will now be described in detail based on examples, but the present invention is not limited thereto.

Examples 1 and 2 and Comparative Example 1 The respective components were blended according to the blending table in Table 1, kneaded with a hot roll, cooled and pulverized to obtain a phenol resin molding material. The phenol resin molding materials of Examples 1 and 2 and Comparative Example 1 were used as 1
A molded product was obtained by molding at 60 ° C. for 3 minutes. 350 these
C., high temperature of 8 hours, long-time treatment was performed, and the dimensional change rate and mechanical properties were measured. The test results are shown in Table 2. As is clear from the results in Table 2, the glass phenolic resin molding material of the present invention is excellent in dimensional stability after high temperature treatment for a long time, and has the same bending strength and Charpy impact strength as those of the comparative material. confirmed.

[0009]

[Table 1] 1) 25 parts with 3 mm fiber length and 20 parts with 1.5 mm fiber length 2) 100 mm fiber length

[0010]

[Table 2]

[0011]

Industrial Applicability According to the present invention, it is possible to obtain a glass phenol resin molding material having a small dimensional change rate after a high temperature treatment for a long time, and its industrial value is extremely large.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroto Oda Inventor Hiroto Oda 172-1 Kagoku, Yuki-shi, Ibaraki Hitachi Chemical Co., Ltd. Minami-Yuki Plant

Claims (1)

[Claims] 1. A glass phenol molding material containing glass fiber and a filler, wherein 1 to 10 parts by weight of silicon polyphosphate is mixed with 100 parts by weight of a phenol resin.