JPS59204632A - Molded article of heat-resistant resin - Google Patents

Abstract

PURPOSE:A molded article of resin having improved heat resistance without damaging transparency, by blending a high polymer resin with gibbsite type aluminum hydroxide having total Na2O content <= a specific value as a filler. CONSTITUTION:A high polymer resin such as PP, PE, PS, PVC, polyamide, polyurea, etc. is blended with gibbsite type aluminum hydroxide (having preferably 3-30mu particle diameter) having <=0.1wt%, preferably <=0.07wt% total Na2O content, to give the desired molded article.

Description

[Detailed Description of the Invention] Invention G+1:iJ! ：Aluminum hydroxide that can be used even under 11 condition 1. 1Li (related to thermoplastic molded articles), which was filled with paper.

Conventionally, Isuisei! Gibbsite-type aluminum hydroxide is used as a filler for the purpose of imparting heat resistance to polymer resins such as rubber, natural rubber, and synthetic resins.

The aluminum hydroxide provides self-extinguishing properties to polymer resins compared to other well-known fillers such as talc, clay, alumina, and calcium carbonate, and has excellent heat resistance.
It is also known to have excellent arc resistance, tong resistance, and tong resistance. If it is used under severe temperature conditions of 1'+1 or more, it may have fatal defects such as whitening of the surface of the molded product or deformation such as "scalding" or "peeling".
Currently, there are restrictions on how it can be used.

Therefore, as seen in JP-A No. 51-27898, the apparent molar ratio of bound water that binds gibbsite-type aluminum hydroxide to one molecule of alumina is 1.8 to 2.9.
Add it so that it falls within the range of! : Processed at relatively low temperature (2oo
A method for producing aluminum hydroxide with excellent heat resistance is taught, which delays the dehydration reaction at temperatures (around 10°C).

By the above method (η, the aluminum hydroxide that is released is the desired one. Molding of polymer resin, foaming of the molded product during processing, prevention of cloudy spots, harsh temperature of molded products and molded products) Although it has the effect of preventing deformation such as "whitening", "blistering" and "peeling" under certain conditions, it is used as a filler for commercial molecular resins that require transparency. Gibbsite type aluminum hydroxide with excellent properties
．． 'During the JH treatment, the molded body itself becomes white and opaque (partially changed to Hemi l-type aluminum hydroxide with a high optical refractive index), and hydroxylated to unsaturated polyester and methyl methacrylate-1. For applications where aluminum is added to make artificial marble, or where a color tone that takes advantage of the transparency of aluminum hydroxide is required, such as for electronic 4A material puddings using unsaturated polyester or epoxy resin. It can be used for a long time, but it has some disadvantages.

As a result of intensive research in order to find a resin molded product that has excellent resistance to 3; The present inventors have discovered that a polymer resin molded article using gibbsite-type aluminum hydroxide as a filler in an amount of 0.1% or less can satisfy all of the above-mentioned physical properties, leading to the completion of the present invention.

That is, the present invention provides a heat-resistant 4Δ1 resin molded article characterized in that a polymer resin is filled with gibbsite-type aluminum hydroxide having a total Na20 content of 0.1% or less.

The present invention will be explained in more detail below.

The aluminum hydroxide used as the filler in the present invention is mainly composed of gibbsite type aluminum hydroxide, and the total soda ff1 (calculated as Na20) contained in the aluminum hydroxide is (), 1 % or less, preferably 0.07% or less.

It has been known to use gibbsite-type aluminum hydroxide as a filler for resin, but the Na20 content of the aluminum hydroxide is usually 0.15% or more, usually 0.2 to 0.4%. degree (for example, Ceramics Volume 17 (3982) 1-5 item) l-]) 341
In fields G where electrical insulation is required, this is water-soluble soda that has been washed with water or chemically after being crushed 0.02 to 0.002% is used.

However, after performing the cleaning process from S and f, s -N a20
The electrically insulating resin filler with a concentration of 0.002% is all N.
Perhaps because the H20 concentration has hardly decreased, the desired objective of the present invention, which is to prevent deformation such as whitening, blistering, and peeling of the polymer resin molded product, is achieved without exhibiting the resistant effect. ] There is no fruit.

Although such aluminum hydroxide type 1~ type aluminum hydroxide with a low Na2O concentration is a very special product, it is possible to use a method in which the precipitation is carried out very slowly in the double production method, such as U.S. Patent No. 401.4985.゛・J Akira $111
It can be obtained by the method disclosed in et al.

The particle shape of the gizozite-type aluminum hydroxide υm used as a filler for resins is not particularly limited as long as it is within the applicable range of ordinary fillers for resins, and is generally 0. 5~60μ,
Preferably, those having a size in the range of 3 to 30 μm are used.

The polymer resin filled with aluminum hydroxide and used as the base material to form the molded product is not particularly limited as long as it is a conventional aluminum hydroxide or a polymer resin known in the field that has been used as a filler. For example, synthesis of thermoplastic resins such as polypropylene, polyethylene, polystyrene, polyamide, hinyl chloride, fluororesins, thermosetting resins such as urea resins, melamine resins, epoxy resins, unsaturated polyesters, alkyd resins, styrene-phtadiene rubber, etc. Examples include rubber and natural rubber.

The polymer resin and aluminum hydroxide are sufficiently dispersed in a known mixer such as a Banbury mixer, a Henschel mixer, or a V-type blender, then heated and kneaded, and can be subjected to extrusion molding, injection molding, or the like. Further, in the case of a thermosetting resin, a molded article can be obtained by thoroughly mixing and stirring the resin and then adding a curing agent and the like.

The reason why the resin molded product obtained in the present invention has excellent heat resistance under severe conditions such as solder heat treatment and has the effect of preventing deformation such as whitening, blistering, and flaking is as follows.
Although it is not clear, when observing the crystalline state of gibbsite-type aluminum hydroxide, the total N a20 (jl or high G, L
While the crystal lattice of aluminum hydroxide and aluminum hydroxide is destroyed by soda, when the content is low, the rust crystal lattice has fewer and denser defects, so it is less likely to be exposed to severe temperature conditions. Even if the temperature is 1.1, the decomposition of the bound water of aluminum hydroxide occurs (11): It is presumed that this is due to IC.

As mentioned above, the present invention is a supplementary edition of Give-1.
By using aluminum hydroxide with a total Na20 content of 0.1% or less for 1-I, the heat resistance of the resulting polymer resin molded article is increased to 4=J without impairing transparency. It is something that we have discovered that can be done, and its professional value is extremely great.

EXAMPLES Hereinafter, the present invention will be explained in detail with reference to examples, but the present invention is not limited by these examples.

Example 1 Unsaturated polyester (Sumiatsubu P-10F manufactured by Juju Chemical Co., Ltd.
1) loog, 2g of zinc stearate, henzo peroxide,
A-D shown in Table 1 to 2 g of il (50% BOP diluted product)
Add 150 g of gibbsite-type aluminum hydroxide, mix thoroughly, and pour into a glass casting mold (150 x 100 x, 3 + u) whose surface has been previously treated with a mold release agent at 90°
C. for 1 hour to obtain a molded article.

Next, a plate of 50 x 50 x 3 + u+ was cut out from the molded body and immersed in boiling water at 100°C for 100 hours.
Examined.

The results are shown in Table 2.

Table 1 From the results, it is clear that the product of the present invention is superior in whitening retardation effect compared to the conventional product.

Example 2 Epoxy resin (Sumi Epoxy L', LA manufactured by Juju Chemical Co., Ltd.)
-128) 150 g of give-the-ite type aluminum hydroxide shown in Table 1 was added to 100 g, mixed well, and then 30 g of hardening agent was added and mixed.
After vacuum degassing, the molded product was cured by heating at 20° C. for 124 hours to obtain a molded product.

Then, from the molded body, 50 x 100' x 3 m+
A portion of n was cut out and its solder heat resistance (260° C.) was examined.

The heat resistance time (seconds) measurement results are shown in Table 3.

In Table 3, solder +1h1i% properties were measured from the surface discoloration of heat-treated samples and the presence or absence of puffiness 7''.

From the results shown in Table 3, it is clear that the products of the present invention significantly improve the thermal properties of the epoxy resin molded articles.

Claims (1)

[Scope of Claims] (1) A heat-resistant resin molded article characterized in that a polymer resin is filled with gibbsite-type aluminum hydroxide having a total Na2O content of 0.1% or less. 2) 11 according to claim 1, wherein the average particle size of the Kibuzai;-type aluminum hydroxide is 0.5 to 60 μm in diameter.
11 Thermoplastic resin molding. 3) Total N a20a of gibbsite type aluminum hydroxide
The heat-resistant resin molded article according to claim 1, wherein the content thereof is 0.07% or less.