KR101080772B1 - Painting composition for preventing the contamination of weather strip - Google Patents

Abstract

The present invention relates to a coating composition for preventing contamination of the weather strip, and more particularly, by including an appropriate amount of rubber matrix, butyl halide, filler, sulfur, vulcanizing agent and vulcanizing agent through crosslinking reaction between rubber matrix chains. By forming a high-density pollution prevention layer, the weather strip is improved to prevent migration contamination such as generation of odor caused by decomposition of the foaming agent, vulcanizing agent, etc. of the weather strip, and intrusion of foreign matter into the weather strip sealing part. It relates to a coating composition for preventing contamination of.

Butyl Halide, Transitional Contamination, Weatherstrip

Description

Painting composition for preventing the contamination of weather strip

The present invention relates to a coating composition for preventing contamination of the weather strip, and more particularly, by including an appropriate amount of rubber matrix, butyl halide, filler, sulfur, vulcanizing agent and vulcanizing agent through crosslinking reaction between rubber matrix chains. By forming a high-density pollution prevention layer, the weather strip is improved to prevent migration contamination such as generation of odor caused by decomposition of the foaming agent, vulcanizing agent, etc. of the weather strip, and intrusion of foreign matter into the weather strip sealing part. It relates to a coating composition for preventing contamination of.

The weather strip refers to a rubber part installed at the edge of a door, glass, etc. of the vehicle to perform sealing, and typically includes a main body, a sealing part, and a trim part. The function of the weather strip is to prevent the ingress of water, wind noise, dust, etc. from the vehicle. For this purpose, most of the weather strips except the glass run weather strip have synthetic resin such as sponge.

Synthetic resin such as sponge of the sealing part should have a low compression ratio and low specific gravity in order for the weather strip to have excellent sealing property without applying excessive load to the door, glass, etc. of the vehicle. As a synthetic resin such as a sponge, a foamed synthetic resin having a thermoplastic or thermosetting foam having excellent compressibility is used, in which a sufficient amount of a blowing agent is added to make a low specific gravity bubble. In addition, in the case of a weather strip having a rubber as a matrix, sulfur is added to the raw rubber to cure the rubber, thereby vulcanizing the rubber to produce a product having excellent specific mechanical properties. At this time, there is a difference in the amount depending on the type of vulcanization system, but the vulcanizing agent must be added.

These blowing agents, vulcanizing agents and the like added to the weather strip decompose over time and cause an unpleasant odor, and in some cases, serious pollutants, thereby causing transitional contamination. Contamination occurred not only in the assembly process of the weather strip, but also in the use of devices, apparatuses, and machines in which weather strips, such as automobiles, are used, resulting in considerable inconvenience in the manufacture and use of the weather strip.

In addition to the above foaming agent, vulcanizing agent through the foam structure of the independent cell, open cell, carbon black, ultramarine, titanium oxide, zinc oxide, red iron oxide, Prussian blue, azo pigment, nitron pigment, Pollution sources such as color lakes, phthalocyanine pigments, aromatics, paraffins, etc. may pass through, but they have a problem of polluting the weather strip to generate transmissive pollution or odors.

However, until now, no rubber composition has been proposed to prevent such transitional contamination.

Accordingly, the present inventors have researched and tried to solve such a conventional problem, and when the rubber coating composition containing butyl halide is applied to the weather strip sealing part, the halogenated butyl which is highly reactive induces a crosslinking reaction between rubber matrix chains. The present invention has been completed by knowing that a high density layer having low permeability can be formed to prevent transitional contamination of the weather strip.

Accordingly, an object of the present invention is to provide a coating composition for preventing contamination of a weather strip including a rubber matrix, butyl halide, filler, sulfur, vulcanizing agent and vulcanizing aid in a predetermined content ratio.

The present invention 100 parts by weight of the rubber matrix; 40 to 80 parts by weight of butyl halide; 55 to 135 parts by weight of filler; Sulfur 0.5 to 1.5 parts by weight; 0.5 to 2 parts by weight of a vulcanizing agent; And a coating composition for preventing contamination of the weather strip including 5 to 10 parts by weight of a vulcanizing aid.

Hereinafter, the present invention will be described in detail.

The present invention comprises a rubber matrix, a butyl halide, a filler, a sulfur, a vulcanizing agent and a vulcanizing aid in an appropriate amount to form a high-density antifouling layer through the crosslinking reaction between rubber matrix chains to decompose the blowing agent, vulcanizing agent, etc. of the weather strip. The present invention relates to a coating composition for preventing contamination of the weather strip, which is improved to prevent the generation of odors and the transitional contamination such as ingress of foreign matter into the weather strip sealing portion.

The weather strip to which the coating composition of the present invention can be applied is a conventional rubber weather strip. However, it is more preferable to use a rubber in which a butyl rubber and a thermoplastic resin or a thermosetting resin are mixed.

The rubber matrix may be used without limitation the synthetic rubber that can be applied to conventional coating compositions, preferably ethylene-propylene diene rubber (EPDM) or styrene-butadiene rubber (SBR).

Halogenated butyl is added to form crosslinks between the rubber matrix chains to form a high-density antifouling layer having low gas permeability. The halogen element is dropped in the portion substituted with the halogen element to increase reactivity, thereby forming crosslinks between the rubber matrices. Thus, a dense antifouling layer can be produced. The formation of crosslinks between rubber chains is further facilitated by butyl halides as well as vulcanization systems or peroxide vulcanizations described below.

The butyl halide includes, for example, fluoro butyl, chloro butyl, bromo butyl and the like, and may include 40 to 80 parts by weight, more preferably 40 to 60 parts by weight based on 100 parts by weight of the rubber matrix. If the content of the halogenated butyl is less than 40 parts by weight, the performance of blocking contamination such as odor is reduced, and when used in excess of 80 parts by weight, the heat resistance is weakened, which causes problems of weather strip thermal curing.

Fillers may be used as additives for the purpose of anti-aging, reinforcing and increasing rubber, such as titanium dioxide, clay, calcium carbonate, mica, talc and the like.

The filler may include 55 to 135 parts by weight with respect to 100 parts by weight of the rubber matrix. Preferably, 10 to 50 parts by weight of titanium dioxide and 45 to 85 parts by weight of clay are used in combination. Even better. If the content of the filler is less than 55 parts by weight, the tensile strength is lowered, and the rubber matrix and the butyl halide are poorly mixed. If the content of the filler is more than 135 parts by weight, the heat resistance is lowered, thereby causing thermal curing, and easily mixing the rubber matrix and the butyl halide. The problem arises.

It is preferable that sulfur is contained 0.5-1.5 weight part with respect to 100 weight part of rubber matrices. If the sulfur content is less than 0.5 parts by weight, the permanent compression shrinkage is increased, and when used in excess of 1.5 parts by weight does not promote the premature crosslinking reaction of the rubber matrix and butyl halide.

The vulcanizing agent may contain 0.5 to 2 parts by weight based on 100 parts by weight of the rubber matrix. Vulcanizing agents can be widely used for those used in conventional vulcanization systems, such as thiuram disulfide, morpholine disulfide, alkylphenol disulfide, decommil peroxide and the like. When the content ratio of the vulcanizing agent is included in the above range, the crosslinking reaction by the vulcanization may occur smoothly to promote the crosslinking reaction of the rubber matrix and butyl halide.

The vulcanizing aid is used to activate the vulcanizing agent, to improve the vulcanization efficiency, and can be used without limitation, those conventionally used for weather strip paints. Preferred vulcanizing aids include zinc oxide, zinc-2-mercaptobenzothiazolate (ZMBT), 2-mercaptobenzothiazolate (MBT), tetraethylthiuram disulfide (tetraethylthiuram) disulfide, TETD), tetramethylthiuram disulfide (TMTD), and the like.

The vulcanizing aid may contain 5 to 10 parts by weight based on 100 parts by weight of the rubber matrix. When the content ratio of the vulcanizing aid is included in the above range, the crosslinking reaction by the vulcanization occurs smoothly and the crosslinking reaction of the rubber matrix and butyl halide may be promoted. Can be.

In addition to the above components, additional components may be included in an amount to perform each function within the scope of the present invention. For example, softeners, anti-aging agents, coloring agents and the like.

The softening agent (processing oil) is added to improve the flexibility, processability, etc. of the compounding rubber, and can be used without limitation, those commonly used in the coating for weather strip. The softening agent is more preferable for showing the effect according to the present invention when 10 to 30 parts by weight is included with respect to 100 parts by weight of the rubber matrix.

Anti-aging agent is an additive added in preparation for heat, oxidation, etc., for example, waxes may be preferably used. Antioxidant is more effective to produce the effect according to the present invention containing 1 to 6 parts by weight. If the amount exceeds 6 parts by weight, the odor of the antioxidant may occur, which may be undesirable.

In addition, various colors may be implemented in the appearance of the rubber weather strip, which is generally black, by adding various color additives.

The transferable antifouling layer of the present invention is not limited to a certain method and may be adhered to the weather strip according to various methods, but a production method by extrusion is preferred. In addition, methods such as spraying, sputtering and bonding are possible.

Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to Examples.

Examples 1-5

A coating composition according to the present invention was applied to a conventional weather strip used as an automotive weather strip as shown in Table 1 below.

Component (parts by weight) Example One 2 3 4 5 Rubber matrix EPDM 100 100 100 100 100 Butyl halide Chlorobutyl 80 70 60 50 40 Filler Titanium dioxide 10 20 25 25 50 Clay 45 55 65 75 85 sulfur Sulfur 0.5 0.7 One 1.2 1.5 Vulcanizer Alkylphenol Disulfide (Vultac 5) 1.5 1.5 1.5 1.5 1.5 Vulcanization Zinc oxide 5 5 5 5 5 2-mercaptobenzothiazolate (MBT) One One One One One Tetramethylthiuram disulfide (TMTD) 0.5 0.5 0.5 0.5 0.5 Softener Drakeol Supreme White Oil 10 15 20 25 30 Anti-aging Sunolite wax - 1.5 3 4.5 6

Experimental Examples 1-5

After coating the coating composition for preventing the present invention on the weather strip, the physical properties of the weather strip were measured by the following method.

<Measurement method>

1. How to measure odor

The weather strip test piece was collected, placed in a sealed space (descigator) and left at 80 ° C. for 70 hours, and five people confirmed the smell. The grade was divided into 1 to 5 grades from the case of odor to the case of no smell.

2. How to measure pollution

100 mm long specimens were taken from the middle of the weatherstrip loops and the sliding sections. The test piece was put on a coating plate, and the load of 0.5 kgf was applied, and it was left to stand for 16 hours in the 80 degreeC thermostat. After that, the paint plate was washed with water and examined for contamination. In addition, after the paint plate was left for 24 hours in the watermeter (contamination) was also examined for contamination.

3. Measurement method of heat resistance

After taking 200 mm long specimens at any location on the weather strip, install them on the same chassis used in automobiles, heat aging at a test temperature of 80 ° C for 70 hours in a gear-type aging tester, and then leave them at room temperature for at least 30 minutes. The presence of cracks in the weather strip was measured.

4. How to measure cold resistance

Cold resistance was maintained at -40 degreeC for 5 hours, and the low temperature embrittlement test was performed, and the presence or absence of a crack in a weather strip was measured.

5. Method of measuring permanent compression rate

A test piece of 100 mm length was taken from the weather strip sealing part and mounted on a chassis used for automobiles. After compressing by 25% of the specimen thickness and allowing 200 hours to stand, the ratio of the reduced thickness to the initial thickness was expressed as a percentage.

ingredient Example One 2 3 4 5 Odor test 4.5 4.5 4.0 4.0 4.0 Pollutant No occurrence No occurrence No occurrence No occurrence No occurrence Heat resistance No crack No crack No crack No crack No crack Cold resistance No crack No crack No crack No crack No crack Permanent Compression Decrease (%) 35 30 30 27 25

As described above, the coating composition for preventing contamination of the weather strip of the present invention includes a rubber matrix, butyl halide, filler, sulfur, vulcanizing agent and vulcanizing aid in an appropriate amount to prevent high density contamination layer through crosslinking reaction between rubber matrix chains. By forming the scavenger, it is possible to prevent transferable contamination such as generation of odor due to decomposition of the foaming agent, vulcanizing agent and the like of the weather strip, and penetration of external foreign matter into the weather strip sealing part.

Furthermore, it is expected to be used not only in automotive weather strips, but also in other parts that perform sealing functions, including foam structures, to prevent odors and contamination.

Claims (8)

100 parts by weight of the rubber matrix; 40 to 80 parts by weight of butyl halide; 55 to 135 parts by weight of filler; Sulfur 0.5 to 1.5 parts by weight; 0.5 to 2 parts by weight of a vulcanizing agent; And 5-10 parts by weight of a vulcanizing aid. The coating composition of claim 1 wherein the rubber matrix is ethylene-propylene diene rubber (EPDM) or styrene-butadiene rubber (SBR). The coating composition according to claim 1, wherein the butyl halide is fluoro butyl, chloro butyl or bromo butyl. The coating composition of claim 1, wherein the filler is selected from the group consisting of titanium dioxide, clay, calcium carbonate, mica and talc. The coating composition according to claim 1, wherein the vulcanizing agent is thiuram disulfide, morpholine disulfide, alkylphenol disulfide or decommil peroxide. The coating composition according to claim 1, wherein the vulcanizing aid is zinc oxide, zinc-2-mercaptobenzothiazolate, 2-mercaptobenzothiazolate, tetraethylthiuram disulfide or tetramethylthiuram disulfide. The coating composition according to claim 1, further comprising 10 to 30 parts by weight of a softener. The coating composition according to claim 1, wherein the anti-aging agent further comprises 1 to 6 parts by weight.