JPH02120343A - Rubber composition for extrusion molding - Google Patents

Abstract

PURPOSE:To obtain the title composition which can give an extrudate markedly improved in adhesion to a general-purpose adhesive by mixing an extrudable rubber compound comprising a nonpolar diene rubber and carbon black with a resin acid-treated CaCO3 or SiO2 and a terpene/phenol resin. CONSTITUTION:The title extrudable rubber compound used for molding a rubber extrudate to be fixed to another member with an adhesive contains a nonpolar diene rubber as a starting rubber and carbon black, wherein 10-30 pts.wt. at least either of resin acid-treated CaCO3 (one obtained by surface-treating CaCO3 of a particle diameter <=0.1mum with rosin acid) and resin acid-treated silica is added to 100 pts.wt. starting rubber, and 2-20 pts.wt. terpene/phenol resin is added to 100 pts.wt. starting rubber. According to the above, the adhesion of the molding to a general-purpose adhesive can be markedly improved, and a good adhesive strength can be attained when the extrudate is fixed to another member (a polar member) with a general-purpose adhesive (including a double- coated tape).

Description

Detailed Description of the Invention <Industrial Application Field> The present invention is used to mold rubber extrudates that are fixed to other parts using adhesives, and the raw rubber is a non-polar diene-based rubber. It is a rubber and relates to a rubber compound containing carbon black.

Examples of extruded products to which this rubber compound can be applied include dams (sealan + (steam prevention material) for fixing automobile window panels), weather strips, etc.In this specification, the compounding unit is Especially: It doesn't change: 'The weight is independent.

<Prior Art> Here, explanation will be given by taking as an example the dam used for fixing the soundboard of the above-mentioned automobile, but the present invention is not limited to this.

As shown in FIG. 1, the dam 1 is used as a dam to prevent the sealant 9 from flowing when fixing the glass window plate assembly with the flush mount molding 3 assembled to the window frame 7 of the vehicle body. Fixing to the glass window plate 5 is usually done with double-sided tape 11.

The dam 1 was conventionally made of chloroprene rubber (CR), but from the viewpoint of material and labor efficiency (economic efficiency), styrene butadiene (SBR) and isoprene rubber (CR) were used.
Extrusion molding using non-polar diene rubbers such as IR) and butadiene rubber (BR) is being considered.

<Problem to be solved by the invention> However, a dam made of extruded non-polar rubber can be fixed with double-sided tape (
The present inventor discovered that when attempting to fix the adhesive layer to a glass window plate, etc. using an acrylic pressure-sensitive adhesive with excellent weather resistance and heat resistance, it is difficult to obtain sufficient adhesive strength. This was discovered as a result of their study. The reason for this is presumed to be that adhesives are usually composed of polar resins and are extremely incompatible with one another.

The extrusion molding rubber compound of the present invention improves the adhesion of an extruded article made of the compound to an adhesive, and as a result, the extruded article can be bonded to other parts (including double-sided tape) with a general-purpose adhesive (including double-sided tape). The purpose of this invention is to make it possible to obtain good adhesive strength when attempting to fix the adhesive to a polar member.

<Means for Solving the Problems> The extrusion molding rubber compound of the present invention solves the above problems by having the following configuration.

The following requirements must be met for extrusion molding rubber compounds that are used to mold rubber extrusions that are fixed to other parts using adhesives, where the raw material rubber is non-polar diene rubber, and which are formulated with carbon black. It is characterized by comprising:

(2) Resin acid treatment One or both of calcium carbonate and silica is blended in an amount of 10 to 30 parts per 100 parts of raw rubber.

■2 to 20 parts of terpene phenol resin is blended with respect to 100 parts of raw rubber.

Detailed Description of Means The rubber compound of the present invention is based on the premise that the raw material rubber is a non-polar diene rubber and that it is a carbon black (hereinafter abbreviated as "carbon") formulation.

In addition to the above-mentioned 5BR1IR and BR, raw rubbers include:
Examples include natural rubber (NR) and butyl rubber (IIR).

In carbon black formulations, in addition to carbon black, zinc white, process oil, stearic acid, vulcanizing agent, vulcanizing agent, etc. are usually added based on conventional techniques. Contains L accelerator etc. In addition, a foaming agent is further blended in the bonnet formulation. Table 1 shows an example of a sponge formulation made of raw rubber or SBR.

In the case of compounded rubber based on the premise of two feet, the following two points are essential in the present invention.

(2) Resin acid treatment One or both of calcium carbonate and silica is blended in an amount of 10 to 30 parts (preferably 15 to 25 parts) per 100 parts of raw rubber.

Here, (6) fatty acid-treated calcium carbonate refers to particle
to 1μm or less calcium carbonate, 81 +1fi
Surface treated with acid (rosin acid), specifically MSK-G (manufactured by Maruo Calcium Co., Ltd.), Calflex-D (manufactured by Kicho Lime Industry Co., Ltd.), Ayanka-DD (Shiraishiko Co., Ltd.). It is possible to list products that are marketed under one brand name, such as (manufactured by Naisha). If the blended amount is outside the above numerical range, the lower side
For both upper sides, the whitening property in the row of tangent n811 of the extruded product has been changed to 4.
j? Can not.

In addition, calcium carbonate and white fillers other than those mentioned above cannot improve the adhesion to adhesives in extruded products. Calcium carbonate, silica, etc. are generally called white fillers.

(3) Terpene phenol resin is blended in an amount of 2 to 20 parts (preferably 5 to 10 parts) per 100 parts of raw rubber.

Here, specifically as the terpene phenol resin,
Examples include those commercially available under trade names such as YS Polyster 5145 (manufactured by Yasuyu Kogyo Co., Ltd.) and Tamanol 803-P (manufactured by Arayo Kagaku Co., Ltd.).

If the amount of the resin is less than 2 parts, the adhesion to the adhesive in extrusion 1 cannot be improved, and if it exceeds 20 parts, the kneading processability deteriorates, which is not desirable.

Moreover, the effects of the present invention cannot be expected with tackifiers other than those mentioned above. Note that terpene phenol resin is a type of tackifier.

A rubber compound having the above requirements can be prepared by a conventional method.
After a kneading operation, a tape-shaped unvulcanized rubber material for extrusion is obtained.9Then, the above-mentioned dam etc. are formed by the above-mentioned extrusion.

<Operations and Effects of the Invention> As described above, the extrusion molding rubber material of the present invention is used for molding rubber extrudates that are fixed to other parts using an adhesive, and the raw material rubber is a non-polar diene. In extrusion molding rubber compounds containing carbon black,
■10 to 30 parts of resin acid-treated calcium carbonate or silica or both are blended to 100 parts of raw rubber, and ■terpene phenol resin is mixed with 10 parts of raw rubber.
Depending on the composition, 2 to 20 parts are blended to 0 parts,
As shown in the Examples below, the adhesion of the extrudate to a general-purpose adhesive is significantly improved.

Therefore, as a result, when trying to fix the extruded product to another member (polar member) using a general-purpose adhesive (including double-sided tape), it becomes possible to obtain good adhesive strength.

Although it is outside the scope of the present invention, even if silica is used as the reinforcing agent instead of carbon black, if the white filler and tackifier of the present invention are combined, the same
What is the effect of 3? ! It is estimated that the

<Examples> Examples will be described below along with comparative examples in order to confirm the effects of the present invention. Although a sponge formulation was used here, similar results were obtained with Soritz F and a rubber formulation.

In the basic formulation shown in Table 1, the monthly charge prepared by kneading the white filler and tackifier shown in Table 2 in a conventional manner,
Using an extruder, an extrudate with a cross section of 20 mm x 2 mm was formed (vulcanization conditions: hot air at 200°C x 5 minutes).

Then, double-sided tape was attached to each extrudate (conditions: 5 kg mouth - round trip). The double-sided tape used was manufactured by Sekisui Co., Ltd. and had a total thickness of 0.1 mmL and had an acrylic pressure adhesive applied to both sides of a polyester base.

After pasting each test piece obtained in this way, it was left to stand for 24 hours.
0°! I! 11 mlJ test t-('lsu ■ speed:
200 m mountain/9). The results are shown in Table 2.

From the results in Table 2, it can be seen that each example of the present invention has a ratio of I2
Compared to M, the adhesive (acrylic adhesive) has 7χ
It can be seen that the adhesion is improved.

The extruded product made of the CR compound was similarly tested and the result was 41 g, /5 + nm.

In addition, Comparative Example 6, in which an excessive amount of terpene phenol tree 148 was blended, showed a 711 female strength close to each example, but the kneading processability was very poor, that is, the roll tack was poor. Ta.

Furthermore, Example 4 using silica as a white filler
Regarding Example 2, in which resin acid-treated calcium carbonate was mixed in a plate, the extrudability was evaluated by Garbe die (extrusion temperature, 80 ° C.
), the evaluation tAj was 12 for the former and 16 for the latter, indicating that Example 2 containing resin acid-treated calcium carbonate had better extrudability.

Table 1

[Brief explanation of the drawing]

FIG. 1 is a schematic cross-sectional view of a dam for sealant of an automobile window glass to which the present invention is applicable. 1. Dam, 3. Flush mount molding, 5. Window glass, 9. ...Sealant, 1...Double-sided tape. Patent application Toyoda Gosei Co., Ltd.

Claims (1)

[Scope of Claims] A rubber compound for extrusion molding that is used to mold a rubber extruded product to be fixed to another member using an adhesive, the raw material rubber is a non-polar diene rubber, and the compound is carbon black. The product is characterized by meeting the following requirements. (1) One or both of resin acid-treated calcium carbonate and silica is contained in an amount of 10 to 30 parts by weight per 100 parts by weight of raw rubber.
Contains parts by weight. (2) 2 to 20 parts by weight of terpene phenol resin is blended with respect to 100 parts by weight of raw rubber.