JPH03274147A - Preparation of glass run - Google Patents

Abstract

PURPOSE:To prepare a weather strip wherein a urethane lubricating layer is provided to a glass slide region with good productivity by extruding a glass run main body so as provide an adhesive layer composed of specific blend rubber or the rubber compound thereof and applying solventless type urethane paint to the adhesive layer to simultaneously cure the adhesive layer and the paint in a vulcanizing process. CONSTITUTION:A glass run main body is extruded so as to provide an adhesive layer 5 composed of blend rubber consisting of nitrile rubber 40-80wt.%, ethylene/propylene/diene ternary rubber 20-60wt.% and styrene/butadiene rubber 0-35wt.% or the rubber compound thereof to the glass slide region S of the glass run main body 1 and solventless type urethane paint is applied to the adhesive layer 5 immediately after extrusion and, in the vulcanizing process of the glass run main body, the urethane paint after coating is cured to form a urethane lubricating layer 3.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing a glass run whose main body is made of EPDM and whose glass sliding portions are provided with a urethane slipping layer.

Examples of glass runs to which the present invention can be applied include door glass runs (4% Figure 2), door glass weather strips (Figure 3), and the like.

A list of polymer/plasticizer abbreviations used herein is shown below.

NBR...Nitrile rubber, EPDM...Ethylene-α-olefin-nonconjugated diene copolymer rubber, typified by ethylene propylene diene ternary rubber, SBR...Fragrance, typified by styrene-butadiene rubber. Group vinyl compound-conjugated diene copolymer rubber, DOP-...dioctyl phthalate.

<Prior Art> Glass run bodies are usually made of EPDM from the viewpoint of weather resistance, ozone resistance, heat resistance, etc.

There are also glasses in which a urethane slippery layer is formed in place of the flocked slippery layer at the sliding part of the glass (Japanese Patent Publication No. 57-14
(See Publication No. 986, etc.).

<Problem to be solved by the invention> However, the adhesion between the EPDM base material and the urethane coating is not good. Therefore, after extruding and vulcanizing the glass run body, puff finishing, degreasing, and degreasing of the glass sliding area are required. It requires pre-processes such as coating the urethane paint, and furthermore, it is necessary to cure the urethane coating film in a drying oven after applying the urethane paint, which results in poor productivity, and if continuous production is attempted, production will be slow. The line has become very long.

In view of the above, an object of the present invention is to provide a method for manufacturing a glass run, which can manufacture a weatherstrip having a urethane slipping layer on the glass sliding part with good productivity, and can also shorten the production line. It is about providing.

Means for Solving the Problems> The present invention solves the above problems with the following configuration.

A method for manufacturing a glass run in which the glass run body is made of EPDM and a urethane slipping layer is formed on the glass sliding area, the glass run body having an NBR of 40 to 8 on the glass sliding area.
0% by weight, EPDM: 20-60% by weight, and S
BR: The glass run body is extruded with an adhesive layer made of a blended rubber or a rubber compound thereof having a content of 0 to 35% by weight, and a solvent-free urethane paint is applied on the adhesive layer immediately after the extrusion. and, in the vulcanization step of the glass run body, the urethane paint after the coating is cured to form the urethane slippery layer.

<Detailed explanation of the means> The means of the present invention will be explained in detail below.

In addition, in the following explanation, "1 part" and "1%" indicating the compounding unit,
Units are by weight unless otherwise specified.

(1) In the present invention, basically, the glass run body 1 is made of EP.
This is a method for manufacturing a glass run made of DM and having a urethane slipping layer 3 on the glass sliding portion S.

Here, EPDM is made by adding a small amount of non-conjugated diene such as ethylidene norbornene, cyclopentadiene, or 1,4-hexadiene as a third component to ethylene or α-olefin, and copolymerizing it to form a double bond in the side chain. This made it possible to vulcanize with sulfur.

The polymer usually contains a reinforcing filler (carbon black or white carbon), a plasticizer, a lubricant,
Add auxiliary materials such as vulcanizing chemicals.

Table 41 shows examples of formulations (solid rubber) of EPDM compounds that can be used in the present invention.

(2) The first feature of the method of the present invention is that the glass run body 1
An adhesive layer (glue line) 5 made of the following specific blended rubber or a rubber compound thereof is formed on the glass sliding portion S, and is coextruded with the glass run body 1. That is, the materials of the glass run body 1 and the adhesive layer 5 are coextruded. That is, the extruder 11 for glass run body
And the adhesive layer extruder 13 is connected to the multicolor extrusion head 15 to carry out coextrusion.

rNBR: 40-80%, EPDM: 20
-60%, and SBR: 0-35%. The blend rubber is partially the same as that described in JP-A-62-17204, and is usually prepared by emulsion polymerization.

(2) If the NBR is less than 40%, the adhesion to the urethane slipping layer 3 is poor. Moreover, if it exceeds 80%, the adhesiveness with the rubber substrate 1 made of EPDM will be poor, and problems will likely arise in the ozone resistance of the adhesive layer S itself.

(2) When the EPDM content is less than 20%, problems tend to occur in the ozone resistance of the adhesive layer 5 itself, and when the EPDM content exceeds 60%, problems tend to occur in the adhesion with the urethane slippery layer 3.

(2) If the SBR exceeds 35%, the adhesion with the urethane slipping layer 3 will deteriorate and problems will likely occur in ozone resistance.

(2) The above blended rubber usually contains auxiliary materials such as a reinforcing filler (carbon black or white filler), a plasticizer, a lubricant, a vulcanizing agent, and, if necessary, a coloring agent.

Table 2 shows an example of the formulation. However, the thickness of the adhesive layer 5 should be set to 0. When forming a thin layer with a thickness of less than Sl-, it is not necessary if migration of auxiliary materials such as a vulcanizing agent from the glass run body 1 can be expected.

(2) The thickness of the adhesive layer 5 is 0.05 to 2 mm.

If it is less than 0.05 m1, the effect of the adhesive layer will be difficult to smell;
If it exceeds (2), the material cost increases and the rubber properties of the glass run body 1 are lost, which is not desirable.

(3) Next, immediately after extruding the glass run body 1, the paint application device 17 disposed immediately after the extrusion head 15 applies
Urethane paint is applied to the glass sliding portion S of the glass run body 1, that is, on the adhesive layer 5.

As for the application method, among the general-purpose methods, various methods such as flow coating (shower coat), brush coating, roller coating, dip coating, and spray coating can be applied, but if the coated surface has an uneven shape or is deformed, If it is easy to apply, flow painting is preferable.

The coating amount at this time is such that the coating thickness is 20 to 1000 μm depending on the required sliding properties.

Table 1 shows examples of formulations (solid rubber) of EPDM formulations that can be used in the present invention.

(4) The second feature of the present invention is that a solvent-free urethane paint is used as the paint for forming the urethane slipping layer.

Here, solvent-free urethane paint is a liquid paint containing a polyisocyanate component added to a liquid polyol component. !
! A liquid consisting only of film-forming elements, lubricants, and pigments, and does not contain evaporative diluents such as solvents. The reason for the solvent-free type is that when curing the urethane coating in the glass run vulcanization process, the solvent that permeates into the unvulcanized rubber evaporates during vulcanization, causing foaming on the rubber base material surface. This is to eliminate the possibility that the coating film will become avatar-like.

Generally, two-component paints such as the "Desmofene/Smidur" paints shown in Table 3 are desirable in terms of physical properties, but -wave type paints may also be used.

In addition, this urethane paint contains liquid and solid lubricants as appropriate.
It is desirable to add. As a liquid lubricant, dimethyl silicone oil (kinetic viscosity = 3,000 to 300,000 C3t) etc. is used, and as a solid lubricant, fluororesin powder (particle size of 5 to 30 μm) is used.
m), molybdenum disulfide, boron nitride, tungsten disulfide, graphite fluoride, and the like. The amount of these lubricants is usually 5 to 100 parts of the coating film component.
100 copies. If it is less than 5 parts, it is difficult to obtain the effect of adding a lubricant, and if it exceeds 100 parts, problems tend to occur such as a decrease in coating film strength and adhesion to the substrate.

(5) Subsequently, in the vulcanization process of the glass run body 1,
The urethane coating film after application is simultaneously cured to obtain a urethane slipping layer 3.

On the national side, the vulcanization process uses microwave heating equipment (UHF).
21 and a hot air vulcanizer (HAV) 22.

The above vulcanization conditions are usually 200° C. for 3 to 10 minutes.

These conditions are sufficient to cure the urethane paint.

In the case of the manufacturing method of the present invention, immediately after extrusion of the glass run body 1 provided with the adhesive N5, the urethane paint forming the urethane slipping layer 3 is applied, and then the urethane paint film is simultaneously cured in the vulcanization process. The urethane slipping layer 3 can be formed on the glass run body simply by doing this.

<Operations and Effects of the Invention> As described above, the method for manufacturing a glass run provided with a urethane slipping layer of the present invention includes attaching a glass run body to a glass run body with an adhesive layer made of a specific blended rubber or a rubber compound thereof. Immediately after extrusion, a solvent-free urethane paint is applied on the adhesive layer, and in the vulcanization process of the glass run body, the applied urethane paint film is simultaneously cured to form a urethane slippery layer. Since it is a method, it has the following actions and effects.

Conventionally, in order to form a urethane slippery layer on the glass sliding area of a glass run, pre-processes such as puff finishing, degreasing, and coating of brusher are required on the sliding area, and furthermore, after applying the urethane paint, a heat curing process is required. However, productivity was not good and the production line became longer to achieve continuity.

On the other hand, in the manufacturing method of the present invention, a urethane paint is applied on the glass sliding part of the glass run body immediately after extrusion,
A urethane slippery layer can be formed simply by transporting it to the vulcanization process, and glass runs equipped with a urethane slippery layer can be manufactured with good productivity, and the production line is also much shorter than in the past.

<Example> The following is an example/example conducted to confirm the effects of the present invention.
A comparative example will be explained.

Crosshead type extruder (specification cylinder diameter 60 φ
, a compression ratio of 1.5) to form the glass run main body 1 and the adhesive layer 5, respectively, using the rubber materials having the respective formulations in Tables 1 and 2, to form a glass run with the cross section shown in FIG. (
However, adhesive layer thickness excluding urethane slip layer 3: 0.2
1-) is extruded (conditions: extrusion speed 5 m/min). After that, the urethane paint with the formulation shown in Table 3 after vacuum defoaming (
After forming a urethane coating film 3 by applying a urethane coating film 3 on the adhesive layer S to a thickness of 97,550 μm using a shower coating method, the glass run was carried into a hot air vulcanization device and heated at 200°C. The urethane paint was simultaneously cured on the main body 1 and the vulcanized lid of the adhesive layer 5 under the conditions of x10 minutes to produce a glass run having the urethane slipping layer 3.

The glass run thus produced was left to stand at room temperature for 24 hours, and then tested for the following items.

(1) Adhesive strength test (180° peeling 1 m); ■Adhesive layer 5
The adhesive strength between the glass run body 1 (base portion 1!1 side) was measured at a tensile rate of 10 cm/min.

■The adhesive strength between the urethane slippery layer 3 (sliding lip portion 1b side) and the adhesive layer 5 is determined by adhering reinforcing cloth (cotton cloth) to the surface of the urethane slippery layer 3 in advance, and Speed, 1o
It was measured under the condition of cm/min.

From the $4 table showing the above measurement results, it was found that the adhesive layer of each example had good adhesion to both the glass run body (rubber base) and the urethane slipping layer, and that the three-component system containing SBR was good. When used, it is further found that the adhesion of the adhesive rubber layer to the glass run body (rubber substrate) is improved.

Table 4 also shows the rubber physical properties of the adhesive layer itself, which were measured according to JIS K-6301. It can be seen that when SBR is excessive, ozone resistance is not good.

(2) Dynamic friction coefficient measurement test Width 5 gll from the formation site of the urethane slippery layer 3 (sliding wobble 1b side) in the glass run of Example 5.

A sample with a length of 50+ mm was taken and attached to the lower surfaces of both sides of a 50 x 50 x 1-mt iron plate with the urethane slipping layer 3 side facing down to prepare a test piece. A 1 kg weight was placed on the test piece, and the test piece was pulled at a speed of 100 l/1 inch on a glass plate, and the average tensile load during sliding was divided by the weight of the test piece. In the case of Example 5, it was 0.25.

(3) Glass abrasion resistance test; Using a square type abrasion tester equipped with a glass abrasion element (5 omt), load: 1 kg, abrasion element cycle, 60 times/
Win, I! An abrasion test was conducted on the urethane slippery layer 3 in the glass run of Example 5 under the condition that the wear stroke was 145 mm. In the case of Example 5, after 10,000 wears,
There was no exposure of the rubber base material at any of the sliding parts.

No. 1 table (unit: parts by weight) *Manufactured by Japan Synthetic Rubber Fruit table

[Brief explanation of drawings]

FIG. 1 is a schematic process diagram showing an example of the method for manufacturing a glass run of the present invention, FIG. 2 is a sectional view showing an example of a glass run using the manufacturing method of the present invention, and FIG. It is a sectional view showing an example. DESCRIPTION OF SYMBOLS 1... Glass run body, 3... Urethane slipping layer, 5... Adhesive layer, 11... Extruder for glass run body, 13... Extruder for adhesive layer, 15...・Multicolor extrusion head, 17... Zero coating device, 22... Hot air vulcanization device, S... Sliding surface.

Claims (1)

[Claims] A method for manufacturing a glass run in which the glass run body is made of EPDM and a urethane slipping layer is provided at the glass sliding area, comprising: NBR: 40
~80% by weight, EPDM: 20-60% by weight, and S
BR: The glass run body is extruded with an adhesive layer made of a blended rubber or a rubber compound thereof having a content of 0 to 35% by weight, and immediately after the extrusion, a solvent-free urethane paint is applied on the adhesive layer. A method for manufacturing a glass run, characterized in that the applied urethane paint is simultaneously cured in the vulcanization step of the glass run body to form the urethane slippery layer.