JPH0859923A - Epdm-based rubber composition - Google Patents

Abstract

PURPOSE: To prevent the blooming (whitening) from occurring in an EPDM-based rubber composition requiring a large amount of a vulcanization accelerator. CONSTITUTION: This EPDM-based rubber composition is obtained by blending 3-6 pts.wt. vulcanization accelerator and adding a mineral of sepiolites in an amount of 1-100 pts.wt., preferably 1-50 pts.wt. based on 100 pts.wt. EPDM thereto in the EPDM-based rubber composition requiring a large amount of the vulcanization accelerator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is an EPDM rubber composition in which bloom is less likely to occur.

[0002]

2. Description of the Related Art Conventionally, EPDM rubber compositions, which generally require a large amount of vulcanization accelerator, have a problem that bloom is likely to occur. E which requires a large amount of vulcanization accelerator
Examples of the PDM rubber composition include the following. That is, EPDM 100 parts by weight Stearic acid 2 parts by weight Zinc white 5 parts by weight Carbon black SRF 80 parts by weight Paraffin oil 40 parts by weight Sulfur 1.0 parts by weight Accelerator MBT 1.5 parts by weight Accelerator TMTD 1.5 parts by weight Foaming agent ADCA 5.0 parts by weight Foaming aid Urea 2.0 parts by weight

[0003]

The problem to be solved is EPDM which requires a large amount of the above-mentioned conventional vulcanization accelerators.
The rubber composition is likely to cause bloom.

[0004]

A first aspect of the present invention is EPDM.
A rubber-based composition, which is obtained by adding a sepiolite mineral.

A second aspect of the present invention is to add 3 to 6 parts by weight of a vulcanization accelerator to 100 parts by weight of a polymer mainly composed of EPDM in an EPDM rubber composition.
It is formed by adding 1 to 100 parts by weight of sepiolite minerals.

A third aspect of the present invention is a rubber composition for a sponge used in a molding portion of a weather strip for an automobile, which comprises EPD.
A polymer containing 3 to 6 parts by weight of a vulcanization accelerator, 2 to 8 parts by weight of a foaming agent, and 1 to 100 parts by weight of a sepiolite mineral, with respect to 100 parts by weight of a polymer containing M as a main component. Is.

[0007]

EXAMPLES Explaining examples, the rubber composition of the present invention is an EPDM rubber composition which requires a large amount of a vulcanization accelerator, and includes a vulcanization accelerator MBT and a vulcanization accelerator T
1.5 parts by weight of each MTD is mixed, and especially, sepiolite minerals are added to 100 parts by weight of EPDM.
1 to 100 parts by weight, preferably 1 to 50 parts by weight is added, and when applied to a sulfur vulcanized sponge rubber,
It is as shown in Table 1.

[0008]

[Table 1]

As the sepiolite type mineral, for example, Milcon (manufactured by Showa Mining Co., Ltd.) represented by Chemical formula 1 can be mentioned. When the amount of the sepiolite mineral is less than 1 part by weight, the whitening prevention effect cannot be exhibited, and when it exceeds 100 parts by weight, the kneading property becomes difficult, so 1 to 100 parts by weight is preferable.

[0010]

Embedded image

Explaining the operation, as is apparent from Table 1, 50% of each vulcanized at 180 ° C. for 4 minutes is used.
When immersed in warm water at 0 ° C for 10 days, the comparative example in which the sepiolite-type mineral is not added has whitening (bloom), whereas the example in which the sepiolite-type mineral is added causes little or no whitening. Disappear. When the white coated sheet metal was brought into contact with the SWOM at 63 ° C. for 70 hours, there was no contamination such as discoloration of the coated sheet including the comparative examples.

The present invention can be applied to a molding material or an extruded material, and is not limited to a molding material.

[0013]

Since the present invention is configured as described above,
The addition of sepiolite minerals can prevent the occurrence of whitening (bloom).

Claims (3)

[Claims] 1. An EPDM rubber composition obtained by adding a sepiolite type mineral to the EPDM rubber composition. 2. An EPD-based rubber composition having EPD
An EPDM rubber composition obtained by adding 3 to 6 parts by weight of a vulcanization accelerator to 100 parts by weight of a polymer containing M as a main component and adding 1 to 100 parts by weight of a sepiolite mineral. 3. A rubber composition for a sponge of a molded part of a weather strip for automobiles, wherein a vulcanization accelerator is added in an amount of 3 to 100 parts by weight of EPDM-based polymer.
An EPDM rubber composition for sponges, which comprises 6 parts by weight and 2 to 8 parts by weight of a foaming agent, and 1 to 100 parts by weight of a sepiolite mineral.