JPS5958018A - Unsaturated polyester resin composition for molding - Google Patents

Abstract

PURPOSE:To obtain the titled composition giving a light-weight molded article having excellent mechanical strength such as bending strength, impact strength, etc., by compounding fine powder of cured thermosetting resin to an unsaturated polyester resin composition for molding use containing inorganic microballoon filler. CONSTITUTION:The objective composition is prepared by compounding (A) an unsaturated polyester resin, (B) inorganic microballoon filler, (C) fine powder of a thermosetting resin (e.g. benzoguanamine resin or melamine resin powder having particle size of 2-3mu), and preferably (D) an inorganic filler, (E) a curing agent (e.g. benzoyl peroxide) and (F) a fiber reinforcing agent (e.g. glass fiber). Preferably, the amount of (B)+(C)+(D)+(E) is 120-250pts.wt. per 100pts.wt. of the component (A), and those of the component (C) and components (E)+(E) are 1/6-5 and 1/2-9 per 1pt. of the component (B), respectively.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to improvements in unsaturated polyester resin compositions for molded articles.

Unsaturated polyester resin is used for tucks, corrugated plates, vibrators,
It is widely used for reinforced plastics such as rods, decorative laminates, paints, insulation materials, etc., and its resin compositions for molded products are generally premixed and bulk molding bound (BAi'C). It is known as Tau Molding Compound (DMC), Sheet Molding Compound (SMC), etc., and is especially used in automobile parts, 'city communications a parts, precision equipment,!・
It is used for applications such as trays and boards.

By the way, resin compositions for molded products of persimmons generally contain unsaturated polyester resins, inorganic fillers, low-resolution agents, glass fibers, mold release agents, face PI, etc. One method that is attracting attention is one in which microscopic hollow spherical inorganic filler is blended as part of the inorganic filler to reduce the weight of the molded product.

However, this kind of material is lightweight (specific gravity 1.2 to 1.5)
However, when this resin composition is kneaded in a kneader and compression molded, the molded product will be different from that of a molded product containing only a regular inorganic filler made by Jubei. Compared to this, there is a decrease in the characteristics or almost a drawback, and the low specific gravity (
It is desired to develop a polyester resin composition that can be molded into molded products with low M)K and little deterioration of properties.

From the above-mentioned viewpoint, the present invention aims to provide an unsaturated polyester resin composition capable of obtaining a molded article having a low specific gravity (light weight) and less deterioration of properties.
In an unsaturated polyester resin composition for molded articles containing a fine hollow spherical inorganic filler as an inorganic filler, a fine powder of a cured product of a thermosetting resin (hereinafter referred to as component (a)) is blended. The present invention relates to a saturated polyester resin composition.

As described above, in the present invention, by using the above component (A) and the micro hollow spherical inorganic filler in combination,
The purpose is to provide a product with low specific gravity and little deterioration in properties.

The N component used in the present invention has a size of 0.5
It is preferable that the value is between μ and lOμ, particularly between 2μ and 3μ. Examples of the thermosetting resin include benzoguanamine resin, melamine resin, phenol resin, polyester resin, etc., and benzoguanamine resin and melamine resin are preferably used. As a commercially available product, FRloo (product name,
(manufactured by Nippon Shokubai Kagaku Co., Ltd.).

The resin composition of the present invention contains silicon,
As a conventional inorganic filler, it is similar to unsaturated polyvarnish and chilled resin compositions for molded articles containing minute hollow spherical inorganic fillers. Dark composition and special gti
Ii('+ 57-50472 K sono example ab).

Any known unsaturated polyester resin can be used as the unsaturated polyester resin.

An example of the micro hollow spherical inorganic filler is ferrite (manufactured by Nippon Ferrite Co., Ltd.).

Further, in addition to the above-mentioned ingredients, standard inorganic fillers (for example, calcium carbonate, Merck), etc. may be used in combination.

In the resin Bi composition of the present invention, there is generally a curing agent,
A fiber reinforcing agent is added.

The curing agent may be appropriately selected from known curing agents depending on the unsaturated polyester resin to be used. Or used in combination.

As the fibrous reinforcing agent, conventionally used ones such as glass fiber, vinyl fiber, polyester fiber, etc. can be used alone or in combination.

If desired, a mold release agent (such as zinc stearate), a curing accelerator, a pigment, and an anti-aging agent may be added to the resin composition according to the present invention.

The blending ratio of each component in the resin composition of the present invention is preferably approximately as follows. That is, for 100 parts by weight of the polyester resin, the total amount of the fine hollow spherical inorganic filler as the filler, the normal inorganic filler, the component (A), and the fibrous reinforcing agent is usually 120 to 250 parts by weight. Heavy tail part, (2> ratio.The N amount ratio of the above various fillers is 1/6 to 5 for the component (A) when the micro hollow spherical inorganic filler is 1, and The total strength of the agent, fiber M, and quality reinforcement cutting is 0 to 9, preferably 1/2 to 9.

The resin #1fIfil according to the present invention is usually prepared as a premix.

The resin composition of the present invention can be made into a molded article by, for example, regular knitting, transfer molding, injection molding, or the like.

The molded product obtained from the wood-based 4 resin composition has low specific gravity. (a) It has characteristics such as poor mechanical strength.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples. In addition, in the failed examples and comparative examples, the word "part" is replaced with "
M quantity means I<J.

Example No Example IJ4Z Comparative Example Unsaturated polyester tree) I ¥'1 25.6 parts
25.6 parts [Ubikar 7195: E1 manufactured by Yubica] Benzoyl peroxide 0.481S
O,4gj<zinc stearate 2.1m
2.1 Part FPloo 1
0.0 part □Ferrite 26,
7 parts 36.7 parts Calcium carbonate 15.7
Part 15.7 parts Glass fiber (1/4')
7.0 parts 7.0 parts Polystyrene
6.3gjS 6.3gjS 6.3gjS 6.2gjS The above composition was mixed at room temperature in a kneader to obtain a resin composition. Using this, 135°C, 75
Kg/r, plate-shaped molded product (15tx) under the condition of 9 minutes
500x500) was obtained by complete heating and pressure molding.

A test piece cut out from the molded product thus obtained was subjected to a characteristic test according to JIS K2O2, 1, 2, and the results are shown in Table 1.

From this result, it can be seen that the molded product obtained from the resin composition by Kien t5j has a low specific gravity and good properties.

(Margin below) Patent applicant: Nitto Electric Industry Co., Ltd.

Claims (1)

[Claims] (1) Microscopic hollow spherical inorganic filler' as an inorganic filler
(ll-compatible unsaturated polyester resin composition for molded products, an unsaturated polyester resin composition for molded products blended with imitation powder of a cured product of thermosetting (η1 fat). An unsaturated polyester resin composition according to claim (1).