JPH0655459B2 - Glass run manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a method for producing a glass run in which a glass run main body is made of EPDM and a urethane sliding layer is provided at a glass sliding portion.

The glass runs to which the present invention can be applied include door glass runs (Fig. 2) and door glass weather strips (Fig. 3).
Etc. can be mentioned.

A list of polymer / plasticizer abbreviations used in the present specification is shown below.

NBR: Nitrile rubber, EPDM: Ethylene propylene rubber (sulfur vulcanizable type), PP: Polypropylene, ABS: Acrylonitrile-butadiene-styrene resin, SBS: Styrene-butadiene-styrene block copolymer, DOP: Phthal Dioctyl acid.

<Prior Art> Many glass run bodies are usually made of EPDM from the viewpoint of weather resistance, ozone resistance, heat resistance, and the like.

In some glass, a urethane sliding layer is formed in place of the flocked sliding layer on the sliding portion of the glass (Japanese Patent Publication No. 57-14).
986, etc.).

<Problems to be Solved by the Invention> However, the adhesiveness between the EPDM substrate and the urethane coating film is not good. Therefore, after extruding and vulcanizing the glass run body,
Pre-processes such as buffing of glass sliding parts, degreasing treatment, primer application, etc. are required.Furthermore, after coating urethane paint, it is necessary to cure the urethane coating film in a drying oven.
The productivity was not good, and the production line became very long when the continuous production was attempted.

In view of the above, an object of the present invention is to provide a method for producing a glass run capable of producing a weather strip having a urethane sliding layer on a glass sliding portion with good productivity and shortening the production line. To do.

<Means for Solving the Problems> The present invention solves the above problems by the following configurations.

A method for manufacturing a glass run in which a glass run main body is made of EPDM and a urethane sliding layer is formed on the glass slide part, comprising: NBR / EPDM
(Weight ratio) = Adhesive layer composed of a blend polymer obtained by adding 5 to 20 parts by weight of at least one of a styrene polymer and a polyalkenamer to 100 parts of a mixture of 80/20 to 40/60 or a rubber compound thereof. And extruding the glass run body, and immediately after the extruding, a solventless urethane paint is applied onto the adhesive layer, and in the vulcanization step of the glass run body, the urethane paint after the application is simultaneously cured. Then, the urethane slippery layer is formed.

<Detailed Description of Means> The means of the present invention will be described in detail below. In the following description, "part" indicating a blending unit means "part by weight".

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

Here, EPDM means that ethylene, propylene are added with a trace amount of non-conjugated dienes such as ethylidene norbornene, cyclopentadiene, and 1,4-hexadiene as a third component, and copolymerized to introduce a double bond into a side chain to add sulfur. It can be vulcanized. And, in the polymer, usually,
Reinforcing fillers (carbon black or white carbon), plasticizers, lubricants, vulcanizing agents and other auxiliary materials are added.

Table 1 shows the compounding recipe (solid rubber) of the EPDM compound usable in the present invention.

A solventless urethane paint is used as the paint for forming the urethane slipping layer.

Here, the solvent-free urethane paint is a liquid polyol component, a liquid film-forming element in which a polyisocyanate component is added, a liquid film consisting of only a coating sub-element such as a lubricant, and a pigment. No evaporative diluent is included. The solvent-free type means that when the urethane coating film is simultaneously cured in the glass run vulcanization step, the solvent that has penetrated into the unvulcanized rubber evaporates during vulcanization, and the rubber substrate surface foams. This is to prevent the coating film from becoming avatar-like.

Usually, a two-pack type paint such as Desmophen / Sumideur paint shown in Table 3 is desirable in terms of physical properties, but a one-pack type paint may be used.

In addition, a liquid / solid lubricant is appropriately added to this urethane paint.
It is desirable to add. As the liquid lubricant, dimethyl silicone oil (kinematic viscosity: 3,000 to 300,000 cst),
Examples of the solid lubricant include Teflon (registered trademark) resin powder (particle size: 5 to 30 μm), molybdenum disulfide, boron nitride, tungsten disulfide, fluorinated graphite and the like. The blending amount of these lubricants is usually 10
It is 5 to 100 parts with respect to 0 parts. If it is less than 5 parts, it is difficult to obtain the effect of adding a lubricant, and if it exceeds 100 parts, a problem tends to occur in the adhesiveness to the substrate.

(3) The first feature of the method of the present invention is that an adhesive layer (glue line) 5 made of the following specific blend polymer or its rubber compound is formed on the glass sliding portion S of the glass run body 1. Co-extrusion with the glass run body 1. That is, the materials of the glass run body 1 and the adhesive layer 5 are used to coextrude. That is, the extruder 11 for the glass run main body and the extruder 13 for the adhesive layer are connected to the multicolor extrusion head 15 for coextrusion.

The above-mentioned blend polymer is one in which 5 to 20 parts by weight of at least one of a styrene-based polymer and a polyalkenamer is added to 100 parts by weight of a mixture of NBR / EPDM (weight ratio) = 80/20 to 40/60. And specifically, JP-A-61-53340, 53.
It is a part of those described in Japanese Patent No. 341,341, and those prepared by an emulsion polymerization method are usually used.

The NBR may be a general-purpose one, but ΔTg = 63-
Those satisfying the requirements of 90 ° C. and the amount of bound nitrile = 10 to 50% are desirable (see JP-A-61-53340).

In NBR / EPDM, when NBR is excessive,
Adhesion to the solid rubber part and ozone resistance are poor, so EP
When DM is excessive, problems tend to occur in the adhesiveness with the urethane slipping layer 3.

Also, as the styrene-based polymer, ABS, SBS
And the like, and examples of the polyalkenamer include transpolypentenamer and transpolyoctenamer.

Reinforcing fillers (carbon black or white carbon), plasticizers, lubricants, vulcanizing agents, and if necessary, auxiliary materials such as colorants are added to the blend polymer.

Table 2 shows the compounding recipe of the carbon black compounding system. However, when the thickness of the adhesive layer 5 is less than 0.5 mm, it is not inevitable when migration of auxiliary materials such as a vulcanizing agent from the glass run main body 3 can be expected.

The thickness of the adhesive layer 5 is 0.1 to 2 mm. If it is less than 0.1 mm, the action of the adhesive layer is difficult to exert, and if it exceeds 2 mm,
This is not desirable because the material cost is reduced and the rubber characteristics of the glass run body 1 are lost.

(3) Subsequently, immediately after the extrusion of the glass run main body 1, by the coating material application device 17 arranged immediately after the extrusion head 15,
Apply the urethane paint to the glass sliding part S of the glass run body 1.
That is, it is applied on the adhesive layer 5.

As the coating method, among general-purpose methods, flow coating (shear coat), brush coating, roller coating, dip coating, spray coating and the like can be applied, but the coating surface has an uneven shape, If it is easily deformed, flow coating is preferable.

The coating amount at this time is such that the coating film thickness is 50 to 2000 μm depending on the required slidability.

(4) Then, in the vulcanization process of the glass run main body 1,
The urethane coating film after coating is simultaneously cured to obtain the urethane slipping layer 3.

In the illustrated example, the vulcanization process is performed by a microwave heating device (UHF).
21 and a hot air vulcanizer (HAV) 22.

The vulcanization conditions are usually 200 ° C. × 3 to 10 minutes.
This condition is sufficient to cure the urethane paint.

In the case of the manufacturing method of the present invention, immediately after extrusion of the glass run main body 1 having the adhesive layer 5, the urethane coating material for forming the urethane slipping layer 9 is applied, and then the urethane coating film is applied in the vulcanization step. The urethane slippery layer 3 can be formed on the glass run main body only by simultaneous curing.

<Operations and Effects of the Invention> As described above, the method for producing a glass run having the urethane slipping layer of the present invention includes a glass run main body having an adhesive layer made of a specific blend polymer or a rubber compound thereof. Immediately after extrusion, a solventless urethane paint is applied onto the adhesive layer, and in the vulcanization step of the glass run body, the urethane coating film after the application is simultaneously cured to form a urethane slipping layer. Since it is a method, it has the following actions and effects.

Conventionally, in order to form a urethane slippery layer on a glass sliding part of a glass run, pre-processes such as buffing of the sliding part, degreasing and primer application are required, and further, a heating and curing process after applying a urethane paint. Required, and the productivity was not good, and the production line became long to be continuous.

On the other hand, in the manufacturing method of the present invention, the urethane coating is applied on the glass sliding portion of the glass run main body immediately after extrusion,
The urethane slippery layer can be formed only by carrying it to the vulcanization step, and the glass run provided with the urethane slippery layer can be manufactured with good productivity, and the production line is significantly shorter than the conventional one.

<Examples> Hereinafter, examples performed to confirm the effects of the present invention will be described.

Cross-head type extruder (specification: cylinder diameter 60 mmφ,
A glass run having a cross-section shown in FIG. 2 (however, a rubber material of each compounding formulation shown in Tables 1 and 2 for forming the glass run body 1 and the adhesive layer 5 by using a compression ratio of 1.5) is used. Excludes urethane slippery layer 3. Adhesive layer thickness: 0.2 mm)
Is extruded (conditions; extrusion speed 5 m / min). After that, the third
The compounded formulation urethane paint (after vacuum defoaming) shown in the table is applied on the adhesive layer 5 by the shower coat method so as to have a film thickness of 100 μm to form the urethane coating film 3, and then the glass run is heated with hot air. It was carried into a vulcanizer, and vulcanization of the main body 1 and the adhesive layer 5 and curing of the urethane coating were simultaneously performed under the conditions of 200 ° C. × 10 minutes to manufacture a glass run having the urethane slip layer 3.

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

(1) Adhesive strength test (180 ° peeling); Urethane slippery layer 3 (base 1a side) and glass run body 1
The adhesive strength between and was measured under the conditions of a tensile speed of 10 cm / min. In the case of this example, the peel strength was 2.5 kg / cm (rubber base material destruction).

(2) Dynamic friction coefficient measurement test: A sample having a width of 5 mm and a length of 50 mm was taken from the site where the urethane slipping layer 3 (sliding lip 1b side) of the glass run was formed, with the urethane slipping layer 3 side facing down. , 50 × 50 × 1 mmt iron plates were attached to both sides to prepare test pieces. On the test piece,
A weight of 1 kg was placed, the glass plate was pulled at a speed of 100 mm / min, and the average tensile load during sliding was divided by the total weight of the test pieces. In the case of this example, it was 0.25.

(3) Glass abrasion resistance test; using a KI type abrasion tester equipped with a glass abrasion element (5 mmt), load: 1 kg, abrasion element cycle: 60 times / mi
n, wearer stroke: A wear test was performed on the urethane slipping layer 3 of glass run under the conditions of 145 mm. In the case of this example, the rubber base material was not exposed at any of the sliding portions after the abrasion of 10,000 times.

[Brief description of drawings]

FIG. 1 is a schematic process diagram showing an example of the method for producing a glass run of the present invention, FIG. 2 is a sectional view showing an example of a glass run to which the production method of the present invention is applied, and FIG. It is sectional drawing which shows the example of. 1 ... Glass run main body, 3 ... Urethane slipping layer, 5 ... Adhesive layer, 11 ... Glass run main body extruder, 13 ... Adhesive layer extruder, 15 ... Multicolor extrusion head, 17 ... Paint coating device, 22 ... Hot air vulcanizing device, S ... Sliding surface.

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Claims (1)

[Claims] 1. A method for producing a glass run in which the glass run body is made of EPDM and has a urethane sliding layer on the glass slide part, wherein NBR / EP is formed on the glass slide part of the glass run body.
Mixture 10 of DM (weight ratio) = 80/20 to 40/60
The glass run main body is extruded with an adhesive layer made of a blend polymer obtained by adding at least 5 parts by weight of a styrenic polymer and 5 to 20 parts by weight of a polyalkenamer to 0 part by weight, or a rubber compound thereof. Immediately thereafter, a solvent-free type urethane paint is applied on the adhesive layer, and in the vulcanization step of the glass run main body, the urethane paint after the application is simultaneously cured to form the urethane slipping layer. A method of manufacturing a glass run, which is characterized in that: