KR20050110801A - The paint and varnish composite for glass run weather strip - Google Patents

Abstract

The present invention relates to a coating composition for glass run weather strip, and more particularly, by including a compound, an adhesive, and an organic solvent that absorbs a liquid present on the surface of the weather strip or reduces the surface tension of the liquid. An improved glass that absorbs or spreads widely on the surface of the copper surface to remove foreign particles, such as dust, from the sliding surface along with the liquid, and to reduce noise and wear caused by the external particles generated between the sliding surface and the glass door. It relates to a coating composition for run weather strips.

Description

Paint composition for glass run weather strip {The paint and varnish composite for glass run weather strip}

The present invention relates to a coating composition for glass run weather strip, and more particularly, by including a compound, an adhesive, and an organic solvent that absorbs a liquid present on the surface of the weather strip or reduces the surface tension of the liquid. An improved glass that absorbs or spreads widely on the surface of the copper surface to remove foreign particles, such as dust, from the sliding surface along with the liquid, and to reduce noise and wear caused by the external particles generated between the sliding surface and the glass door. It relates to a coating composition for run weather strips.

The weather strip refers to a rubber packing installed at the edge of the door of the vehicle, and has a seal portion to block water, wind noise, and dust from entering the vehicle. There are many types of weather strips, including fixed window seals, flange seals, glass run weather strips, and belt strip seals, among which glass run weather strips are used to prevent foreign material from penetrating into the interior of the car. In addition to being able to play a role, it should be possible to prevent malfunction or breakdown of the glass doors.

The sliding way of the weather strip means a glass run weather strip that comes into contact with the glass door according to the vertical movement of the glass door, which is difficult to clean even when washing the car. When the external material such as dust is located between the weather strip sliding surface and the glass door, there is a problem that noise and abrasion often occur due to the repeated vertical movement of the glass door.

Therefore, conventionally, in order to secure the lubricating function of the glass run weather strip, a coating agent such as silicone or urethane is treated on the surface of the rubber weather strip. [Korea Utility Model Registration No. 2001-32908, Japan Special Publication No. 56-19813, Japan Special Publication No. 55-157661, etc.] This coating treatment reduces the friction between the weather strip and the glass so that the glass door opens smoothly. Although it could play a role, there was no sustainability of the effect when silicone was used as a coating because it could easily fall off by friction, and when urethane was used as a coating, there was a disadvantage in that a friction sound was generated.

Accordingly, the present inventors have conducted research to solve the conventional problems, and when the coating material containing a compound, an adhesive, and an organic solvent that absorbs the liquid present on the surface of the weather strip or reduces its surface tension is applied to the weather strip rubber, the weather strip External materials such as dust can be removed together with the liquid on the sliding surface, so noise and abrasion caused by external materials such as dust can be reduced by the vertical operation of the glass door even if the structure or physical properties of the weather strip rubber are not changed. It was found that the present invention was completed.

Accordingly, an object of the present invention is to provide a coating composition for glass run weather strip including a compound, an adhesive, and an organic solvent which absorbs or reduces the surface tension thereof.

The present invention provides a coating composition for glass run weather strip in which the rubber matrix is a raw material, wherein the compound contains 10 to 20 parts by weight of a compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid with respect to 100 parts by weight of the rubber matrix. It is characterized by including -120 weight part and 80-120 weight part of organic solvents.

The present invention will be described in more detail as follows.

The present invention includes a compound, a pressure-sensitive adhesive, and an organic solvent that absorbs the liquid present on the surface of the weather strip or reduces the surface tension of the liquid, thereby absorbing the liquid present on the sliding surface of the weather strip or spreading it widely on the surface. In addition, the present invention relates to an improved coating composition for glass run weather strip to remove external particles such as dust from the sliding surface and to reduce noise and wear caused by the external particles generated between the sliding surface and the glass door.

The glass run weather strip to which the coating composition of the present invention is to be applied may be a general rubber weather strip composed of a rubber matrix, fillers and other additives, and is not limited to those made of specific rubber compositions. However, it is preferable to use an ethylene propylene diene rubber (EPDM), a mixed rubber of ethylene propylene diene rubber and styrene-butadiene rubber (SBR), a thermoplastic polyolefin (TPO) rubber, or the like as the rubber matrix to exhibit the effect according to the present invention.

An appropriate amount of a compound, a pressure-sensitive adhesive, and an organic solvent that absorbs or reduces the surface tension of the liquid, which is an essential component of the coating composition according to the present invention, is determined based on 100 parts by weight of the rubber matrix, which is a weather strip to which the coating composition is applied. This is to make the modulus of 90 to 250 Mpa.

The liquid-absorbing compound, which is an essential component of the present invention, is a three-dimensional network structure in which cross-links are introduced into an electrolyte polymer having a hydrophilic group, and refers to a compound having excellent ability to hold a liquid without dissolving in water. The compound that reduces the amount of the compound means a compound that reduces the surface tension, which means the force for reducing the surface at the free surface of the liquid, so that the portion where the surface is in contact with the liquid can be widened.

Compounds that absorb or reduce the surface tension of the liquid present on the weatherstrip surface do not have to have a specific structure or include a specific composition, and a function or liquid for absorbing a liquid to achieve the object of the present invention. As a compound having a function of reducing the surface tension of the rubber modulus may be all included 350 ~ 1300 Mpa.

However, the compound which absorbs the liquid present on the surface of the weather strip is a copolymer of isobutylene and maleate, a graft polymer of starch and acrylate, a polymer of hydrolyzed acrylic acid, and polyvinyl alcohol. Polymers, celluloses, starches, acrylates and copolymers of celluloses, polyamide-based compounds and the like may be preferably used. Examples of the compound which reduces the surface tension of the liquid present on the weather strip surface are acrylic acid resins and acrylonitrile. , Polyvinyl chloride, polyalkylene polymer, phenolic compound, hydroxybenzoic acid derivative, polysulfone, polyether ether ketone, polyphenylene sulfide, polyimide, polyether imide, etc. Can be.

The form of the compound which absorbs the liquid or reduces the surface tension of the liquid is preferably in the form of powder or fibrous, and the content thereof is preferably 10 to 20 parts by weight based on 100 parts by weight of the rubber matrix. If less than 10 parts by weight of the compound that absorbs the liquid or decreases the surface tension of the liquid, noise and abrasion reduction effect is lowered, if exceeding 20 parts by weight may cause problems in the low-temperature operability of the sliding surface.

In addition, in consideration of the productivity, durability, price, etc. of the weather strip, instead of using a compound that absorbs the liquid present on the surface of the weather strip or decreases its surface tension, the compound, silicone resin, polycarbonate resin, mica, Molybdenum, calcium carbonate, etc. can also be mixed and used.

The pressure sensitive adhesive, which is an essential component of the present invention, has two functions, firstly, a compound that absorbs a liquid or reduces a surface tension of the liquid, and a compound that adheres to the weather strip rubber; Function to adjust the modulus of rubber.

Such adhesives include, for example, one or two selected from urethane, silicone, polybutylene terephthalate, 6-nylon, 66-nylon, polyamide resin, polystyrene resin, urea resin, phenol resin, melanin resin, and mixtures thereof. Although the above mixture can be used, it is preferable to mix and use 2 or more types of compounds for adjustment of modulus.

It is preferable that an adhesive is 80-120 weight part with respect to 100 weight part of rubber matrices. If the content of urethane, silicone, etc. is less than 80 parts by weight, the generation of noise due to the infiltrated dust does not decrease, and if it exceeds 120 parts by weight, there is a problem that the noise due to the up and down operation of the glass increases.

If two or more compounds are used in combination, the total content thereof should be 80 to 120 parts by weight, but in the case of urethane, 10 to 80 parts by weight, silicone, polybutylene terephthalate, 6-nylon, 66-nylon, In the case of polyamide resin, polystyrene resin, urea resin, phenol resin and melanin resin, it is preferable that 10-60 weight part is contained.

When the adhesive is included as described above, the modulus of the weather strip rubber is adjusted to 90 to 250 Mpa to reduce the noise between the weather strip sliding surface and the glass door.

The organic solvent, which is an essential component of the coating composition according to the present invention, is used to mix the coating composition well and adhere well to the weather strip rubber, and toluene and methyl ethyl ketone (MEK) are preferably used together.

Although 80-120 weight part is preferable with respect to 100 weight part of rubber matrices, the total content of the organic solvent has more preferable 40-60 weight part of toluene and methyl ethyl ketone, respectively. When the content of the organic solvent is less than 80 parts by weight, the mixing is poor and the adhesive strength is lowered. When the content of the organic solvent is greater than 120 parts by weight, it may adversely affect the drying and the adhesion may be lowered.

In addition to the essential components used above, it is possible to use other various additives within the scope of the object of the present invention. For example, hydrophilic metal oxides, alkali silicates, alkali borosilicates, etc., may be used to promote the ability of compounds to absorb or reduce the surface tension of weather strips and to adjust the amount of moisture in the glass run weather strip sliding surface. You can keep it. As an example of such a hydrophilic metal oxide, one or a mixture of two or more selected from Al ₂ O ₃ , ZrO ₂ , TiO _2, and mixtures thereof may be used.

The coating composition of the present invention can be applied to the sliding surface of the glass run weather strip by a method such as spray, roll, brush, extrusion coating or the like.

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

Examples 1-4 and Comparative Examples 1-4

The coating composition of this invention which contains the component of Table 2 was spray-coated to the weather strip rubber containing the component of Table 1, and it dried in 100 degreeC drying furnace.

Glass Run Weatherstrip Rubber Content (parts by weight) Rubber matrix Ethylene Propylene Diene Rubber (EPDM) 100 Filler Carbon Black N-550 100 fatty acid Stearic acid 2 Processing Catalyst Zinc Oxide (ZnO) 4 Processing oil Paraffin oil 90 Vulcanizer sulfur 0.5 Vulcanization accelerator ZDBC (Zinc Di-n-butyl Dithiocarbamate) 4 ZDMC (Zinc Di-n-methyl Dithiocarbamate) 4 TETD (tetraethyl thiuram disulfide) 4 DTDM (4,4'-dithiodimorpholine) 2

Ingredients (parts by weight) Example Comparative Example One 2 3 4 One 2 3 4 Compounds that absorb liquids or reduce their surface tension Phenol 10 - - - - - - - cellulose - 10 - - - - - - Poly (methyl methacrylate) - - 10 - - - - - Polyethylene - - - 10 - - - - Teflon - - - - 10 - - - adhesive urethane 70 40 40 40 - 70 40 60 silicon 30 60 60 60 - 30 60 40 Organic solvent Toluene 50 50 50 50 - 50 50 50 Methyl ethyl ketone 50 50 50 50 - 50 50 50

Experimental Example

The physical property of the weather strip which apply | coated the coating material of Examples 1-4 and Comparative Examples 1-4 by the following method was measured, and is shown in Table 3.

<Measurement method>

1) modulus

Modulus was obtained by measuring the ratio of unit stress to unit strain (paragraph (3) of JIS K6301).

2) contact angle of water

A drop of distilled water was dropped on the sliding surface of the glass run weather strip, and the angle between the tangent drawn on the liquid surface and the weather strip surface was measured at the point where the weather strip surface and the meniscus met.

3) surface tension

The surface tension of the sliding surface was measured using methylene iodide. The contact angle of methylene iodide was obtained and the surface tension was calculated using the Wu's equation.

4) Solubility Parameter

The solubility parameter is a value indicating mutual intimacy between molecules and measured by dividing the binding energy of the molecule by the volume of the molecule.

5) surface roughness

Surface roughness was measured according to JIS (Japanese Industrial Standard) B 0651-1973.

6) Noise and wear measurement

After cutting the cross section of the weather strip, a test piece including the sliding surface of the weather strip was prepared, and then fixed to a jig. After putting the glass on the sliding surface and fixing it together with the jig, the surface pressure on the glass was 10 kg / cm 2. 10 mg of dust is sandwiched between the sliding surface and the glass and 5 ml of water is dropped into the dust. Move the operating plate with glass and sliding surface with 1.0 kg / ㎠ of surface pressure. The operation plate was repeatedly moved at a speed of 100 mm / s for 1 second to measure noise using a microphone recorder. Noise was measured while gradually increasing the surface pressure of 1.0 kg / cm 2 to 1.5 kg / cm 2, 2.0 kg / cm 2, 2.5 kg / cm 2 and 3.0 kg / cm 2.

In addition, the number of repetitions of the operating plate was increased 500 times, 1000 times, and 2000 times under a surface pressure of 1.5 kg / cm 2, and the presence of wear on the sliding surface of the weather strip was observed by an optical microscope.

Properties Example Comparative example One 2 3 4 One 2 3 4 Rubber modulus (MPa) of compounds to absorb liquids or reduce their surface tension 640 640 240 382 - - - - Sliding surface rubber modulus (MPa) 95 88 85 88 240 88 80 80 Sliding surface tension (* 10 N / m) 3.8 3.7 3.8 3.7 3.2 3.4 3.4 3.4 Contact angle of water (degrees) 84 86 83 87 90 90 92 92 SP value (J / ml) 25.0 25.0 32.2 20.1 16.2 12.0 12.0 12.0 Surface Roughness (Ra) 2.4 2.5 1.8 2.2 1.8 1.8 1.7 1.9 Noise generation Surface pressure 1.0 kg / ㎠ Prize Prize Prize Prize Prize Prize medium medium Surface pressure 1.5 kg / ㎠ Prize Prize Prize Prize Prize medium medium medium Surface pressure 2.0 kg / ㎠ Prize Prize Prize Prize medium medium medium Ha Surface pressure 2.5 kg / ㎠ Prize medium medium medium medium Ha Ha Ha Surface pressure 3.0 kg / ㎠ Prize medium medium medium Ha Ha Ha Ha Wear out 500 times radish radish radish radish radish radish radish U 1000 times radish radish radish radish radish U U U 2000 times radish radish radish radish radish U U U

The rubber modulus of the sliding surface is 90 in the case of Examples 1 to 4 including a compound, an adhesive, and an organic solvent, which absorb a liquid having a rubber modulus of 350 to 1300 Mpa or reduce the surface tension of the liquid, within the scope of the present invention. It can be seen that the noise and abrasion can be significantly reduced by adjusting to 250 Mpa.

In the case of Examples 1-4 containing a compound which absorbs a liquid or reduces the surface tension of the liquid, it turns out that it is smaller than Comparative Examples 1-4 in the contact angle of water. The smaller the contact angle of water is, the more water spreads on the surface of the sliding surface, so that abrasion and noise caused by external particles such as dust can be reduced, and the moisture of the sliding surface can maintain an appropriate level. In addition, when the SP value is 20 J / ml or more and the surface roughness is 1.8 to 10.0 Ra, there is less tendency for dust to adhere to the sliding surface. It can be judged as an excellent weather strip.

As described above, the glass run weather strip coating composition of the present invention includes a compound, an adhesive, and an organic solvent that absorbs the liquid present on the surface of the weather strip or reduces the surface tension of the liquid, thereby preventing the external surface such as dust on the sliding surface. There is a significant effect of preventing the particles from adhering or removing them from the sliding surface with the liquid to reduce the noise and abrasion by external particles generated between the sliding surface and the glass door. It is expected to be widely used in the automotive industry, as well as in a variety of industries that use rubber glass run weather strips.

Claims (6)

In the coating composition for glass run weather strip whose rubber matrix is a raw material, 10 to 20 parts by weight of a compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid, based on 100 parts by weight of the rubber matrix, 80 to 120 parts by weight of the pressure-sensitive adhesive and 80 to 120 parts by weight of the organic solvent. Coating composition for glass run weather strip. The coating composition for a glass run weather strip according to claim 1, wherein the compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid is phenol. The coating composition for a glass run weather strip according to claim 1, wherein the compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid is cellulose. The coating composition for glass run weather strip according to claim 1, wherein the compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid is poly (methyl methacrylate). The coating composition for glass run weather strip according to claim 1, wherein the compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid is polyethylene. The coating composition for glass run weather strip according to claim 1, wherein the compound which absorbs the liquid on the surface of the weather strip or reduces the surface tension of the liquid is Teflon.