JPS608021B2 - Glass run for vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a glass run for vehicles, and more specifically, it has good glass abrasion resistance without flocking, exhibits excellent sealing performance, and has low glass sliding resistance. The purpose is to provide grass runs.

A glass run is an automotive part that is attached to the window frame of a vehicle such as an automobile and makes contact with the edge of the window glass to prevent wind and rain from entering the room when the window glass is closed. Manufactured by extrusion molding into a shape.

FIG. 1 is a cross-sectional view showing an example of the glass run A, which is iron-cast in the window frame S and extends inward from the edges of the base 1, side surface 2, and side surface 2. It consists of a lip 3 forming a contact surface with. In addition to the above-mentioned sealing properties, this glass run is required to have glass abrasion resistance and low glass sliding resistance since it comes into sliding contact with the window glass when it is opened and closed, and is also required to have weather resistance and non-contamination to the car body. be done. In response to these demands, we are currently developing synthetic materials for the fingering parts of the glass run body made of rubber (the sliding saddle part 31 of the lip 3 with the glass and the sliding part 11 of the base part 1 with the glass in FIG. 1). Alternatively, those with flocked natural fibers, those with a soft polyvinyl chloride glass run body coated with a paint that has the effect of imparting wear resistance to the sliding contact area with the glass, or those with flocked fibers have been put into practical use.

However, a product made of soft polyvinyl chloride glass run that does not undergo post-processing such as flocking, paint, or other surface treatments and has the same performance as the glass run currently in practical use has not yet been realized. is the actual situation. The reason for this is that currently, in order to provide the necessary and sufficient wear resistance to European-grade polyvinyl chloride glass run without surface treatment, it is necessary to reduce the amount of plasticizer and increase the hardness. ) Using polyvinyl chloride resin with a high degree of polymerization (average degree of polymerization 4000 or more), '3} Highly filling fluororesin, 'Consider combinations of 4- or more,' but '1'
In the case of , the original purpose of glass run, the sealing performance, is impaired, in the case of '21, it is impossible from the viewpoint of processability and cost, and in the case of '3-, it is not practical as the cost will be extremely high, and No successful case has been reported yet. However, if it were possible to manufacture a soft polyvinyl chloride glass run that satisfies the required standards without surface treatments such as flocking or paint application, it would be possible to simplify the manufacturing process and significantly reduce costs. Therefore, there is a strong demand for the realization of such a grass run.

In view of this situation, the inventors conducted research to put into practical use a glass run that does not require surface treatment by incorporating various additives into a polyvinyl chloride composition. As a result, polyvinyl chloride resin with an average degree of polymerization of 2,000 to 4,000
0 parts by weight, plasticizer 40-120 parts by weight, viscosity 5 x 1
Glass run obtained by extrusion molding from a polyvinyl chloride composition containing 1 to 7 parts by weight of polydimethylsiloxane of 1 to 1 centistokes (hereinafter referred to as CS) and an appropriate amount of a stabilizer can be used for surface treatments such as flocking, coating, etc. They discovered that it has excellent abrasion resistance, low friction properties, and sealing properties without the need for additional coatings.

The reason for setting the average degree of polymerization of polyvinyl chloride to 2,000 to 4,000 is that if it is less than 2,000, it will lack elasticity and deformation, and will not exhibit sufficient sealing performance as a glass run, and if it is more than 4,000, it will have poor formability and cost. This is because it is impractical.

As for plasticity, phthalate esters such as di(2-ethylhexyl) phthalate, dibutyl phthalate, and diisodecyl phthalate, linear dibasic systems such as dioctyl adibate and dioctyl sepacate, and phosphate esters such as triphenylphosphite. In addition, trimellitic acid ester-based, polyester-based epoxy compounds, or a combination thereof can be used.

The reason why the amount of plasticizer added is 40 to 120 parts by weight is because the hardness required for automotive glass run is 60 to 90Hs (J
ISK-6301 Type A), and in order to obtain a hardness within this range, it is appropriate to mix 40 to 12 parts by weight, taking into account differences in plasticizing efficiency depending on the type of plasticizer. Polydimethylsiloxane may be unmodified or modified with substituents such as amino groups, alkyl-acrylic groups, alcohols, glycols, and the like.

The reason why the glass run of the present invention maintains excellent wear resistance and low friction is because the above-mentioned polydimethylsiloxane inherently has a moisturizing effect and has poor compatibility with vinyl chloride resin, so it constantly migrates onto the glass run surface little by little. However, it is recognized that this is due to the sustained moisturizing effect on Grass Run. Polydimethylsiloxane with a viscosity of 5 x 1 and CS deteriorates the appearance of the molded product, and polydimethylsiloxanes with a viscosity of 1 and CS or higher are not industrially produced and are difficult to obtain. The reason why the amount of polydimethylsiloxane added is 1 to 7 parts by weight is because if it is less than 1 part by weight, sufficient wear resistance as a glass run cannot be obtained.
This is because if the amount exceeds 7 parts by weight, the appearance of the product will be significantly deteriorated. The stabilizers for soft polyvinyl chloride used in the glass run of the present invention are not particularly specified, and include metal soaps such as cadmium, barium, zinc, and calcium, dialkyltin laurates, malates, and mercaptides, and organic and inorganic compounds of lead. , or a combination thereof with an epoxy compound, a phosphite, a polyol, a hindered phenol, etc. may be used.

However, it is desirable to mix the tin-based stabilizer with the polydimethylsiloxane during dry blending, and it is not desirable to mix the two in advance before blending. Addition amount is 1~
Approximately 8 parts by weight is appropriate. In addition to the above additives, inorganic fillers such as light or automotive calcium carbonate, talc, and clay, processing aids such as polymethyl methacrylate and polyester, pigments, and other additives may be added as necessary. You can also do that.

As mentioned above, the glass run of the present invention is a glass run made by extrusion molding a European vinyl composition prepared by blending a polyvinyl chloride resin with polydimethylsiloxane of a predetermined viscosity, as well as appropriate amounts of a plasticizer and a stabilizer. It has excellent sealing properties, good glass abrasion resistance, and low glass abrasion resistance, so it can be put to practical use and exhibits excellent performance without the need for flocking or paint application like conventional products. .

In addition, regarding film resistance and non-staining properties for automobile bodies, polyvinyl chloride has no double bonds or tertiary carbon in its repeating units in principle due to its molecular structure, and compared to rubber products, amine-based aging prevention They are generally better than rubber products because they do not use agents or process oils. The polyvinyl chloride composition used in the present invention does not inhibit these properties. EXPERIMENTAL EXAMPLE Glass run according to the present invention and comparative glass run having the shape shown in the second figure were extruded using various formulations.

and abrasion resistance, glass sliding resistance and compression set (
The surrogate properties of sealability) were evaluated. Typical examples of blended compositions are shown in Table 1. In the table, DOP is di(2-ethylhexyl) phthalate. {1} Lip 30 of glass run A' in the shape shown in Figure 2, which was set for evaluation of wear resistance.
The abrasion element B was fitted between the 30 mm and the end surface was pressed against the base surface 11, and the abrasion element was reciprocated under the following conditions to measure the depth of wear.

Wear element・・・・・・Glass (thickness: 5 skins) Load・
......3k9 wear element stroke...
・・145 rib wear cycles ・・・6 main cycles/min'2
} Evaluation of sliding resistance of glass Insert a glass plate between the lips 30 and 30 in the same way as above, fix the glass run, pull up the glass plate with an Instron type universal testing machine, and evaluate the sliding resistance based on the pulling stress at that time. did.

Tensile testing machine...Toyo Baldwin Tensilon UTM-1 5000-W slider...
...Glass 250 x 100 x 5 skin glass run length...
……Low rib sliding speed 205 capes/min Glue Evaluation of compression set (substitute characteristics for sealing properties) JI
The 10 compression set test method of SK 6301 was followed.

However, the test temperature was 70±100, and the compression time was 22 hours. If the compression set is about 65% or less, there is no problem in practical sealing performance. Table 2 shows the results of each of the above evaluations for the grass run shown in Table 1. On the table, mark 0...Wear depth 0-0.5 skin, ×
Mark: Wear depth: 0.5 to 1 rib, XX mark:
...The wear depth is 1 willow or more. As is known from the results, the glass run of the present invention is excellent in all aspects of wear resistance, low sliding resistance, and sealing performance.

Table 1 Table 2

[Brief explanation of drawings]

FIG. 1 is a sectional view of a general automobile glass run in a roughened state, and FIG. 2 is a diagram showing an aspect of a wear resistance test of the glass run of the present invention. A, A'...Glass run, S...Window frame sash, G...
・...Window glass, B...Abrasion element for abrasion resistance test. Figure 1 Figure 2

Claims (1)

[Claims] 1 100 parts by weight of polyvinyl chloride resin with an average degree of polymerization of 2000 to 4000, 40 to 120 parts by weight of plasticizer, viscosity 5
A glass run for a vehicle is made by extrusion molding a soft vinyl composition containing 1 to 7 parts by weight of polydimethylsiloxane having a density of 10^3 to 10^5 centistokes and 1 to 8 parts by weight of a stabilizer.