JP3121521B2 - Unsaturated polyester resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an unsaturated polyester for use in electric parts such as a casting material for sealing electric and electronic parts, a sealing material for a motor of a washing machine and the like, a switch case and a relay case. It relates to a resin composition.

[0002]

2. Description of the Related Art Conventionally, unsaturated polyester resin compositions have excellent electrical properties and mechanical strength, and are used for casting and sealing electric and electronic parts, encapsulating materials for motors of washing machines, switch cases, relay cases, and the like. Widely used as materials for electrical parts, bathtubs, septic tanks, building materials, etc.

Since unsaturated polyester resins have low viscosity, they are used as low-cost casting materials by highly filling inorganic powder fillers. However, the unsaturated polyester resin, for example, an unsaturated polyester resin composition obtained by simply adding silica sand, calcium carbonate, clay, etc., is inferior in flame retardancy and tracking resistance, and as a flame retardant,
An unsaturated polyester resin composition using a halogen-based flame retardant or a phosphorus-based flame retardant has a problem that harmful gases such as a halogen-based gas and a phosphorus-based gas are generated during combustion.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to maintain good casting workability, flame retardancy and tracking resistance. An object of the present invention is to provide an unsaturated polyester resin composition which is excellent in heat resistance and suppresses generation of harmful gas during combustion.

[0005]

The unsaturated polyester resin composition according to the first aspect of the present invention is obtained by adding a curing agent, a curing accelerator, a filler and a flame retardant to an unsaturated polyester resin. In a saturated polyester resin composition,
The unsaturated polyester resin is a xylene resin-modified unsaturated
A polyester resin having a viscosity of 1 to 25 ° C.
500 centipoise xylene resin-modified unsaturated polyester
10 to 200 parts by weight of silica sand having an average particle size of 50 to 3000 μm as a filler and 100 to 300 parts by weight of aluminum hydroxide having an average particle size of 5 to 100 μm as a flame retardant, based on 100 parts by weight of the ter resin. It is characterized by doing.

[0006]

Hereinafter, the present invention will be described in detail. The unsaturated polyester resin composition according to the present invention includes, for example, adding and mixing a curing agent such as methyl ethyl ketone peroxide, a curing accelerator such as cobalt naphthenate, a filler such as silica sand and a flame retardant to the unsaturated polyester resin. Is obtained. As the unsaturated polyester resin, it is necessary to use an unsaturated polyester resin having a viscosity at 25 ° C. of 1 to 500 centipoise. That is, the viscosity at 25 ° C. is 50
In the case of an unsaturated polyester resin exceeding 0 centipoise, castability is reduced due to thickening. It is necessary to use silica sand having an average particle size of 50 to 3000 μm as the filler. That is, when silica sand having an average particle size of less than 50 μm is used, the workability of casting decreases due to the increase in viscosity, and
If it exceeds 0 μm, the silica sand will settle in the unsaturated polyester resin composition, so that the casting workability will decrease.

As a flame retardant, the average particle size is 5 to 100 μm
Aluminum hydroxide is used as an essential component. That is, when the average particle size of the aluminum hydroxide is less than 5 μm, the casting workability decreases due to thickening, and when it exceeds 100 μm, the flame retardancy and the tracking resistance decrease.

It is necessary to contain 10 to 200 parts by weight of the silica sand and 100 to 300 parts by weight of the aluminum hydroxide with respect to 100 parts by weight of the unsaturated polyester resin. That is, the unsaturated polyester resin 1
When the amount of silica sand exceeds 200 parts by weight or the amount of aluminum hydroxide exceeds 300 parts by weight with respect to 00 parts by weight, castability decreases due to thickening, and aluminum hydroxide is less than 100 parts by weight. In the case of (1), flame retardancy and tracking resistance decrease.

As the unsaturated polyester resin , xy
An unsaturated polyester resin modified with a len resin is used. That is, by using the xylene resin-modified unsaturated polyester resin, performances such as crack resistance, moisture resistance, and withstand voltage are improved.

[0011]

According to the first aspect of the present invention, there is provided an unsaturated polyester resin composition obtained by adding a curing agent, a curing accelerator, a filler and a flame retardant to an unsaturated polyester resin. Viscosity at 1 ° C
For 100 parts by weight of an unsaturated polyester resin of 100 centipoise, silica sand 10 having an average particle size of 50 to 3000 μm is used.
２００200 parts by weight and 100 to 300 parts by weight of aluminum hydroxide having an average particle size of 5 to 100 μm, so that casting workability is good, flame retardancy and tracking resistance are excellent, and harmful gas is generated when burning. Is unlikely to occur.

The unsaturated polyester resin composition according to the first aspect of the present invention is excellent in crack resistance, moisture resistance and withstand voltage since the unsaturated polyester resin is a xylene resin-modified unsaturated polyester resin.

[0013]

The present invention will be specifically described below with reference to examples.

(Example 1 , Example 2, Reference Example and Comparative Examples 1 to 3) The components of Examples 1 , Example 2, Reference Example and Comparative Examples 1 to 3 are unsaturated polyester resins. Xylene resin-modified unsaturated polyester resin (Matsushita Electric Works;
J3500 (viscosity at 25 ° C .: 40 centipoise) or CJ3012 (viscosity at 25 ° C .: 300 centipoise)) or unsaturated polyester resin (manufactured by Nippon Yupika; trade name: Yupika 2070 [viscosity at 25 ° C. 200
Centipoise]), and 100 parts by weight of methyl ethyl ketone peroxide (manufactured by NOF Corporation; trade name: Permec N) as a curing agent, and 1 part by weight of 6 as a curing accelerator.
% By weight of cobalt naphthenate was used at a ratio of 1 part by weight, and the following substances were used in the respective amounts shown in Table 1.
As the filler, No. 5 silica sand having an average particle diameter of 500 μm, No. 7 silica sand having an average particle diameter of 100 μm, or calcium carbonate (manufactured by Nitto Powder Chemical Co., Ltd .; product number NS-100) was used. As a flame retardant,
Aluminum hydroxide (manufactured by Showa Denko KK; trade name: Heidilite H10 [average particle size: 50 μm]) or Heidilite H
32 [average particle size 10 μm]) or red phosphorus (manufactured by Rin Kagaku Kogyo Co., Ltd .; trade name: Nobaret # 120)

Compounding was carried out in the respective amounts of Example 1 , Example 2, Reference Example and Comparative Examples 1 to 3 shown in Table 1, and the mixture was mixed at room temperature for 10 minutes using a mixer. The mixture was mixed to obtain an unsaturated polyester resin composition. Casting was carried out using these unsaturated polyester resin compositions, and each test piece was prepared at room temperature for 24 hours. Regarding the casting workability, all of Examples , Reference Examples and Comparative Examples were good. The flame resistance was measured based on the UL94V-0 test, and the tracking resistance was measured based on IEC500V. The results are shown in the evaluation column of Table 1. In addition, Example 1 and Example 2 were compared with the reference example .
The unsaturated polyester resin composition was excellent in crack resistance, moisture resistance, and withstand voltage.

[0016]

[Table 1]

As shown in Table 1, the results of Examples 1 and 2 of the present invention are shown.
And it turned out that a reference example is an unsaturated polyester resin composition excellent in flame retardancy and tracking resistance compared with Comparative Examples 1 to 3. In particular, it was confirmed that no harmful gas was generated as compared with Comparative Example 3.

[0018]

The unsaturated polyester resin composition according to claim 1 of the present invention is constituted as described above.
According to the unsaturated polyester resin composition according to claim 1 of the present invention, casting workability is good, flame retardancy and tracking resistance are excellent, harmful gas is hardly generated at the time of combustion , and
Excellent crack resistance, moisture resistance and withstand voltage.

[0019]

Claims (1)

(57) [Claims] 1. A curing agent in unsaturated polyester resin, curing promoter, the unsaturated polyester resin composition obtained by adding a filler and a flame retardant, wherein the unsaturated polyester resin
If the fat is a xylene resin-modified unsaturated polyester resin
Te, a viscosity at 25 ° C. is 1 to 500 centipoise key
For 100 parts by weight of the silene resin-modified unsaturated polyester resin, 10 to 200 parts by weight of silica sand having an average particle size of 50 to 3000 μm as a filler and 5 to 200 parts by weight of an average particle size as a flame retardant.
An unsaturated polyester resin composition comprising 100 to 300 parts by weight of aluminum hydroxide having a thickness of 100 to 100 µm.