JPH09136977A - Method of making elastomer have gas barrier property and oil resistance and resin-coated elastomer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce weight and production cost, to widen the range of the selection of elastomers and resins and to firmly join an elastomer and a resin. SOLUTION: The surface of an elastomer 1 is halogenated and/or roughened and then is coated with a resin 2 having gas barrier properties and oil resistance. The layer of the elastomer 1 can be made thin to reduce the weight and also the cost of the production can be reduced since it is not required to use expensive elastomers relatively low in gas permeability. Since after the surface of the elastomer 1 is halogenated and/or roughened, the coating with the resin 2 is carried out, the elastomer 1 and the layer of the resin 2 can be bonded firmly and the range of the selection of usable elastomers and resin can be widened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for applying a resin to an elastomer such as rubber to impart gas barrier property and oil resistance, and a resin-coated elastomer obtained by the method.

[0002]

2. Description of the Related Art Generally, rubber and thermoplastic elastomer are
Gas permeability is extremely high. This is because the rubber molecules tend to move freely.

For this reason, conventionally, as a measure for improving the gas barrier property of parts made of rubber, thermoplastic elastomer or the like used in a portion where gas permeation is not preferable,
For example, the following method is known.

(A) A base rubber such as nitrile rubber (NBR) and hydrin rubber (ECO) is used as a base, and a fluororubber (FKM) or hydrogenated nitrile rubber (H-NBR) having a relatively low gas permeability is used. Use a multilayer structure.

(B) A resin layer having a small gas permeability is provided on the surface of rubber.

[0006]

However, in the conventional method (a), it is necessary to thicken the rubber layer as a whole, so that the weight becomes large and the fluororubber, hydrogenated nitrile rubber, etc. Because it is expensive
There is a problem that the manufacturing cost is increased.

On the other hand, in the conventional method (b), the types of rubber and resin that can be used are limited, and it is not possible to firmly bond the rubber and the resin layer. There is a problem in that air enters between the layers to cause whitening, or the resin layer floats to cause peeling.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an elastomer with gas barrier properties and oil resistance which can reduce the weight and the manufacturing cost. It is to provide a method of applying and a resin-coated elastomer.

Another object of the present invention is a method for providing a resin layer on the surface of an elastomer, wherein a wide range of elastomers and resins can be selected, and a method and resin for imparting gas barrier property and oil resistance to the elastomer. It is to provide a coating elastomer.

Another object of the present invention is to provide a method for imparting gas barrier property and oil resistance to an elastomer and a resin-coated elastomer capable of firmly adhering the elastomer and the resin layer.

Further objects of the present invention will be apparent from the following description.

[0012]

SUMMARY OF THE INVENTION A method of imparting gas barrier and oil resistance to an elastomer according to the present invention comprises halogenating or (and) roughening the surface of the elastomer, and then halogenating or (and) roughening the surface. The surface of the elastomer is coated with a resin having gas barrier properties and oil resistance.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION As the elastomer coated with resin in the present invention, nitrile rubber (NB
R), styrene butadiene rubber (SBR), diene rubber such as butadiene rubber (BR), styrene thermoplastic elastomer, vinyl chloride thermoplastic elastomer, olefin thermoplastic elastomer, vinyl chloride, polyethylene, or a mixture thereof. Etc. can be used.

As the resin having gas barrier properties and oil resistance in the present invention, type 8 nylon obtained by modifying 6 nylon, polyvinyl alcohol (P
VA), polyvinylidene chloride (PVDC), polyvinylidene fluoride (PVDF), ethylene vinyl alcohol copolymer (EVOH) and the like can be used.

In the present invention, by coating the elastomer with a resin having gas barrier properties and oil resistance, it is possible to impart gas barrier properties and oil resistance to the elastomer.

Along with this, the weight of the elastomer layer can be reduced to reduce the weight, and since it is not necessary to use an expensive elastomer, the manufacturing cost can be reduced.

Further, since the surface of the elastomer is halogenated or (and) roughened and then coated with the resin, the elastomer and the resin layer can be firmly adhered, and the usable range of the elastomer and the resin can be selected. Becomes wider.

[0018]

Embodiments of the present invention will be described below.

(Example 1) Nitrile rubber (JSRN23
5 parts by weight of ZnO, 1.5 parts by weight of vulcanizing agent (sulfur), 0.2 part by weight of vulcanization accelerator (TT), 1 part by weight of vulcanization accelerator (DM), plasticizer per 100 parts by weight of 0S). (DOP) 2
Nitrile rubber was prepared by mixing 0 parts by weight and 40 parts by weight of carbon and kneading the rubber material into a 150 × 150 × 2 mm mold, and vulcanizing it with a press at a pressure of 150 kgf / cm ² , 170 ° C. for 10 minutes. A sheet (hereinafter referred to as NBR) was created.

Next, this NBR sheet was dipped in a mixed aqueous solution of hydrochloric acid and hypochlorous acid to halogenate both sides of the sheet.

Next, the halogenated NBR sheet is dipped in a liquid obtained by dissolving type 8 nylon obtained by modifying 6 nylon in methanol and then pulled up to evaporate the methanol, as shown in FIG. Both sides of the NBR sheet 1 were coated with nylon (resin) 2 (FIG. 1 shows only two layers of nylon on one side).

Table 1 shows NBR sheet 1 uncoated with nylon 2 and nylon 2 as described above.
For both nylon coated NBR sheets coated with O ₂ according to ASTM D1434
The test results of measuring the gas transmittance are shown in Table 2 as JISK62.
58 shows the test results of various physical properties obtained by performing the immersion test according to No. 58 and the test results of the adhesion test by the cross-cut method.

[0023]

[Table 1]

[Table 2] As is clear from Table 1, the nylon coating N
The BR sheet has a much smaller gas permeability and a significantly improved gas barrier property as compared with the NBR sheet 1 which is not coated with nylon 2.

Further, as is clear from Table 2, the nylon coated NBR sheet has remarkably improved oil resistance as compared with the nitrile rubber sheet 1 not coated with nylon 2. Further, as is clear from the table, in the nylon-coated NBR sheet, the adhesiveness between the rubber 1 and the nylon 2 layer is very good, and the nylon 2 layer follows the rubber 1 well even when folded. No whitening or peeling occurs.

(Example 2) Soft polyvinyl chloride (hereinafter,
The sheet is referred to as PVC). Both sides of the sheet are roughened by blasting, and then type 8 nylon obtained by modifying 6 nylon is immersed in a liquid dissolved in methanol and then pulled up to evaporate the methanol to obtain the PVC sheet. Both sides were coated with nylon.

Table 3 shows ASTM D14 in the same manner as in Example 1 for the PVC sheet not coated with nylon and the nylon coated PVC sheet coated with nylon as described above.
34 shows the test results of measuring the O ₂ gas transmittance in accordance with No. 34.

As is clear from Table 3, the nylon-coated PVC sheet has a very small gas permeability and a remarkably improved gas barrier property as compared with a PVC sheet not coated with nylon.

[0028]

[Table 3] Example 3 A styrene elastomer was placed in a mold and melted, and then cooled to room temperature while applying pressure to prepare an elastomer sheet.

Next, the styrene elastomer sheet was dipped in a mixed aqueous solution of hydrochloric acid and hypochlorous acid to halogenate both sides of the sheet.

Next, the halogenated elastomer sheet is dipped in a liquid obtained by dissolving type 8 nylon obtained by modifying 6 nylon in methanol and then pulled up to evaporate methanol to form nylon layers on both sides. Coated

Table 4 shows styrene-based elastomer sheets not coated with nylon and styrene-based elastomer sheets coated with nylon as described above in the same manner as in Example 1 above.
Shows the test results of measuring the transmittance of the O ₂ gas in compliance with STMD1434.

[0032]

[Table 4] As is clear from Table 4, the nylon-coated styrene-based elastomer sheet has a higher viscosity than the nylon-uncoated styrene-based elastomer sheet,
The gas permeability is very small and the gas barrier property is significantly improved.

In each of the above embodiments, the sheet-shaped elastomer is coated with the resin, but in the present invention, not only the sheet-shaped flat elastomer material but also other shapes such as spherical and A resin layer can be coated on the surface of a cylindrical elastomer material,
It goes without saying that the same effect can be obtained.

Further, in each of the above embodiments, only one of the halogenation treatment and the roughening treatment is performed on the surface of the elastomer before coating the resin, but both treatments may be performed.

In the second embodiment, the surface is roughened by blasting, but in the present invention, the surface may be roughened by other means such as plasma, corona discharge, liquid honing and the like.

Further, in each of the above embodiments, the type 8 nylon is applied to the surface of the elastomer by immersing the elastomer in the type 8 nylon dissolved in a solvent. However, in the present invention, another method such as spraying is used. The resin may be coated on the elastomer by applying a resin such as type 8 nylon to the surface of the elastomer.

In each of the above embodiments, type 8 nylon is used as the resin for coating the elastomer, but in the present invention, instead of this type 8 nylon, another type having a gas barrier property and oil resistance is used. A resin can also be used.

[0038]

As described above, according to the present invention, (a) coating the elastomer with a resin having gas barrier properties and oil resistance can impart gas barrier properties and oil resistance to the elastomer. The elastomer layer can be thinned to reduce the weight. (C) Since it is not necessary to use an expensive elastomer having a relatively low gas permeability, it is possible to reduce the manufacturing cost.
It is possible to obtain excellent effects such as firmly adhering the elastomer and the resin layer, and (e) widening the selection range of the elastomer and the resin that can be used.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a resin-coated elastomer according to an embodiment of the present invention.

[Explanation of symbols] 1 rubber (elastomer) 2 nylon (resin)

Claims (12)

[Claims] 1. A method for imparting gas barrier property and oil resistance to an elastomer, which comprises halogenating the surface of an elastomer and coating the surface of the halogenated elastomer with a resin having gas barrier property and oil resistance. 2. A surface of an elastomer is roughened, and a resin having gas barrier property and oil resistance is coated on the surface of the roughened elastomer to impart gas barrier property and oil resistance to the elastomer. Method. 3. A gas barrier property for an elastomer, characterized in that the surface of the elastomer is roughened and halogenated, and the surface of the roughened and halogenated elastomer is coated with a resin having gas barrier properties and oil resistance. And a method for imparting oil resistance. 4. A method for imparting gas barrier property and oil resistance to an elastomer according to claim 1, wherein the resin is a type 8 nylon obtained by modifying 6 nylon. 5. A type 8 obtained by modifying 6 nylon.
The method for imparting gas barrier property and oil resistance to an elastomer according to claim 4, wherein the type 8 nylon is coated on the surface of the elastomer by applying a solution of nylon dissolved in a solvent to the elastomer. 6. The elastomer is a diene rubber, a styrene thermoplastic elastomer, a vinyl chloride thermoplastic elastomer, an olefin thermoplastic elastomer, vinyl chloride, polyethylene, or a mixture thereof. A method for imparting gas barrier property and oil resistance to the elastomer according to 3, 4, or 5. 7. A resin-coated elastomer obtained by halogenating the surface of an elastomer and coating the surface of the halogenated elastomer with a resin having gas barrier properties and oil resistance. 8. A resin-coated elastomer obtained by roughening the surface of an elastomer and coating the surface of the roughened elastomer with a resin having gas barrier properties and oil resistance. 9. A resin-coated elastomer obtained by roughening and halogenating the surface of an elastomer, and coating the surface of the roughened and halogenated elastomer with a resin having gas barrier properties and oil resistance. 10. The resin coated elastomer according to claim 7, 8 or 9, wherein the resin is type 8 nylon obtained by modifying 6 nylon. 11. The resin-coated elastomer according to claim 10, wherein the surface of the elastomer is coated with the type 8 nylon by applying a solution of a type 8 nylon obtained by modifying 6 nylon to a solution of the elastomer dissolved in a solvent. . 12. The diene rubber is used as the elastomer.
The resin coating elastomer according to claim 7, 8, 9, 10 or 11, which is a styrene-based thermoplastic elastomer, a vinyl chloride-based thermoplastic elastomer, an olefin-based thermoplastic elastomer, vinyl chloride, polyethylene, or a mixture thereof.