JPS5842624A - Elastomer article having lubricous layer and its production - Google Patents

Abstract

PURPOSE:To produce the titled article having a markedly lowered coefficient of friction, by applying an unvulcanized elastomer binder containing a lubricous fine powder to an unvulcanized elastomer article and crosslinking the binder and the article together to form an integrated body. CONSTITUTION:A coating solution is prepared by dispersing a lubricous fine powder 1 of particle diameter 0.01-100mum (e.g., graphite), a crosslinking agent (e.g., sulfur) and an elastomer binder 2 in an amount (volume ratio) equal to or below that of the lubricous fine powder in a dispersing medium. Then, this coating solution is applied to the body 5 of an unvulcanized elastomer article made of a material homogeneous with that of the binder, dried and then crosslinked by heating to form a lubricous layer 3, thickness >=10mum, containing lubricous fine powder 1 bonded with binder 2 on the body 5 of the article.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an elastomeric product having a slippery layer and a method for manufacturing the same.

Because of their inherent excellent flexibility, elastomer products are often used as sliding seal members for glass runs, valve bodies, wiper blade rubber, etc., and the sliding resistance between the elastomer product surface and mating parts is said to be extremely high. There are study points. For this reason, various attempts have been made to form a slippery layer on the elastomer product body.

For example, d, slippery fine powder (hereinafter referred to as "sliding material") consisting of graphite, molybdenum disulfide, fluororesin fine powder, etc.
- Mix the elastomer binder containing a crosslinking agent, etc. using a roll mill or Panbury mixer, and then use a calender roll etc. to make a seed form. After superimposing the seed on the uncrosslinked product body, Made of binder and elast! The original product is integrally cross-linked by heating and pressurizing to form a slippery layer t.
Eras F! There was a method of forming it on the product itself.

However, in the case of this method, there are limitations in processing due to roll mills, Pampari mixers, calender rolls, etc., and a large amount of elastomer binder is used relative to the lubricating material (usually 2.5% by volume).
5 times or more), the amount of lubricant in the slipping layer was relatively small, and there was almost no effect of lowering the coefficient of friction. Furthermore, it is necessary to use the above-mentioned apparatus when mixing the lubricant, and it is not always easy to form a lubricant layer.

In view of the above, it is an object of the first invention of the present application to provide an elastomer product having a slipping layer in which the total friction coefficient of the slipping layer is significantly reduced.

A second object of the present invention is to provide, in addition to the object of the first invention, a method for manufacturing an elastomer product that can easily form a slippery layer and completely eliminates the slippery layer.

The first invention of the present application provides a slipping layer t in which the slipping material is bonded with an elastomer binder in an approximately equal amount (volume ratio) or less to the slipping material.
The second invention of the present application is a dispersion liquid tube in which an uncrosslinked elastomer binder containing a lubricant and, if necessary, a crosslinking agent is mixed and dispersed in a dispersion medium. This is achieved by coating the crosslinked elastomer product body and then integrally crosslinking the elastomer binder and elastomer grip to form a slippery layer on the elastomer product body.

The present invention will be explained in detail below.

The method for manufacturing the elastomer product of the present invention is as follows.

(1) Prepare an uncrosslinked preformed elastomer product body. The material of the main body of this product may be an elastomer that crosslinks by heating, such as elastomer material such as Mori, NR, 5BEi.
, CH, NBR, EPDM, or other natural rubber or synthetic rubber, or a blend thereof, with the addition and mixing of an appropriate compounding agent containing a crosslinking agent is used.

(Snow) An uncrosslinked elastomer binder containing a lubricant and a crosslinking agent is mixed and dispersed in a dispersion medium to obtain a dispersion liquid. At this time, the amount of the binder is approximately equal to or less than the amount of the lubricant in terms of volume ratio. When the amount of binder exceeds the same amount, there is almost no effect of lowering the coefficient of friction.

As the lubricating material, graphite of Tsuru Co., Ltd. with a particle size of 0.0/~lOOμ, molybdenum disulfide, fine resin powder with a 7-ton bulk, etc. are used.

Any elastomer can be used as long as it has adhesive properties with the Binder product body, and the same material as the product body is usually preferred, but combinations as shown in Table 1 are also possible. Other polymers such as PE and PP may be added to the elastomer as illustrated in the wood table. Also, like the product itself, the binder includes carphone blanks, i! ! Zinc compound may be added.The crosslinking agent is sulfur or organic peroxide that can crosslink the binder. This is preferable because the bonding strength is high. However, if too much cross-linking agent is added, the binder will lose its flexibility, which is undesirable.Also, if the slipping layer is extremely thin, the cross-linking agent in the product body will migrate to the binder, so the cross-linking agent will not necessarily be added to the binder. No need to add.

Dispersion gh1. A solvent such as toluene, xylene, trichloroethylene, trichloroethane, etc. 6- A solvent that is capable and volatile is preferable, but it does not necessarily have to be a soluble solvent; if the binder is a dispersible solvent, 1 You can.

The viscosity of this dispersion liquid is adjusted to be suitable for coating as described below by adjusting the amount of dispersion medium.

(Depping) The fractional solution prepared in the above procedure is applied to the whole or all parts of the product body prepared in the above procedure.
After coating by a method such as IIJ hair coating or spray coating and drying, the binder and the product body are integrally heated and cross-linked, and as shown in Fig. A sexual layer 3 is formed on the product body S.

In the above, the thickness of the slipping layer 3 is arbitrary, but from the viewpoint of durability of the slipping layer, it is required to be 10 μm or more.

The slipping layer of the elastomer product thus obtained has a large amount of slipping material (sliding material/binder: 1 or more), and therefore exhibits excellent frictional properties and durability as shown in the test examples described below.

(Method for Preparing a Test Piece 6 - A test piece substrate CC100 x 20 x 2°C is prepared using the elastomer compositions shown in Table 6).

In Example/-10, each dispersion liquid was obtained by mixing and dispersing a binder containing a lubricant and a crosslinking agent (same as the base material) in a toluene dispersion medium with the composition shown in Table 3 (with a viscosity of 1 −
/□cP), dry film thickness is 10~JOp by depping.
After coating and drying, 4 ml of the substrate and binder were combined using a hot platen press (/70'CXj Omi, n) to prepare each test piece.

For comparison @/-j, a binder containing a lubricant and a crosslinking agent (same as the base material) with the composition shown in Table 1113 was mixed in a Panbury mixer, and then mixed with a sheet of O0l cod using a calender roll. After superimposing the sample on the substrate, the substrate and binder are integrally cross-linked under the same conditions as above to create each test piece.

Test method and results> For each test piece, W =
While applying a force of J Off/cm F (tensile load)/W (load) was measured, and the measurement results are shown in Table 3 and FIG.

In addition, for the durability test, the above test was repeated, and the degree of increase in the coefficient of friction after reciprocating a predetermined number of times was shown in Figure 1, with the initial value = l. In the diagram, A shows the test piece without a slippery layer (only chlorine treatment), B shows the results of Comparative Example 11, and Example -.

As mentioned above, the elastomer product of the present invention has the effect of significantly lowering the friction coefficient of the slipping layer at the lubricant/binder + 1 (vol ratio) (see Table 3 and Figure 2), Durability is also greatly improved (see Figure 4). t
In addition, the method for manufacturing an elastomer product of the present invention includes a slipping layer 1-
*In some cases, it is only necessary to prepare a dispersion liquid, apply it on the product body, and then heat and crosslink it, and it is possible to easily form a slipping layer in which the slipping material is bonded with a small amount of binder.

Table 1 9- JIN, 2 tables 110- Table 3 Qin P'f2j o wt% content

[Brief explanation of the drawing]

Figure 1M1 is a partial cross-sectional view of the elastomer product of the present invention, Figure 2 is a graph showing the relationship between the lubricant/binder (■01 ratio) and the coefficient of friction in an elastomer product having a slippery layer, and Figure 3 is a graph showing the relationship between the friction coefficient and the lubricant/binder (■01 ratio). Model diagram showing how to measure coefficients, #l
II/- is a graph showing the durability of each elastomer product. l... Sliding material (fine slippery powder), λ... (elastomer) binder, 3... slipping layer, S... (elastomer)
Product body. Patent application Toyoda Gosei Co., Ltd.
− Figure 4 Number of round trips→

Claims (1)

[Claims] (The amount of slippery fine powder is approximately equal to or less than that (volume ratio)
An elastomeric product having a lubricious layer on a body of the elastomeric product, the lubricious layer being bonded with an elastomeric binder. (i) After applying a dispersion in which a non-Chinese elastomer binder containing a slippery fine powder and a crosslinking agent as necessary is mixed and dispersed in a dispersion medium onto an uncrosslinked elastomer product body, the elastomer binder is and an elastomer product are integrally cross-linked, and a slippery layer in which a slippery fine powder is bonded with an elastomer binder in an approximately equal amount or less (volume ratio) is formed on the elastomer product main body. Method for manufacturing elastomer products with a slippery layer◎