JPH02197437A - Carpet for automobile - Google Patents

Abstract

PURPOSE:To contrive the improvement or the like of cold resistance by applying to the reverse side of a carpet by a specific condition a resin composition mainly composed of ethylene-vinyl acetate resin, single or compound of polyethylene, polypropylene, etc., and inorganic filler. CONSTITUTION:A specific resin composition is applied in a specific condition to the reverse side of an automobile carpet. As the specific resin composition, it is formed being mainly composed of 30 to 70 pts. ethylene-vinyl acetate resin with 5 to 10% vinyl acetate, 5 to 20 pts. polyethylene-polypropylene with 0.923 or more specific gravity and single or compound of these copolymer resin and 10 to 40 pts. inorganic filler. A as the specific condition, the above described resin composition is applied to the reverse side of the carpet under condition of 300 to 1000g/m<2>. In this way, cold resistance felt fusibility and shape holdability are improved better than a conventional carpet compounding the inorganic filler in the polyethylene.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a carpet for automobiles, and is characterized by a resin back surface.

<Prior Art> Carpets for automobiles are sometimes used flat, but carpets for use on the floor are molded into that shape. For this reason, polyethylene resin, ethylene vinyl acetate (EVA) resin, or a combination of these with an inorganic filler such as calcium carbonate is used for the back surface of the carpet.

The former polyethylene resin blended with inorganic filler is used with a coating process on the back side of 400-1000 g/ni'', and the latter EVA resin blended with inorganic filler is used for sound insulation carpets.゜5-
5 Kg/n? The one coated with is used.

<Problems to be solved by the invention> Among the above polyethylene resins, in which inorganic fillers are blended, various physical properties decrease as the proportion of inorganic fillers increases, and the decrease in cold resistance is particularly serious. . On the other hand, when molding PET, a method is generally adopted in which a cushioning material is set on the lower die and the cushioning material is welded to the back surface of the carpet at the same time as the molding is performed by press working. This felt weldability deteriorates as the amount of inorganic filler increases, making it necessary to raise the heating temperature during molding. If the temperature is raised, there is a problem in that the thermal shrinkage of the carpet becomes large and the pile is scorched. This phenomenon is particularly likely to occur in winter. Furthermore, there are problems such as a decrease in shape retention performance of the molded product.

Means for Solving the Problems> In order to solve these problems, the present invention has been made by changing the composition of the resin layer to vinyl acetate (abbreviated as VA) 5-10.
% (7) By using 30-70 parts of EVA resin, polyethylene with a specific gravity Q of 923 or more, polypropylene, 5-20 parts of these copolymers alone or in combination, and 10-40 parts of inorganic filler as the main components. I was able to resolve the issue.

If the VA of EVA resin is less than 5%, the blending ratio of EVA resin is less than 30 parts, the proportion of polypropylene resin is more than 20 parts, or the inorganic filler calcium carbonate is more than 40 parts, the coating film may be Cold resistance and felt welding processability at the same time are insufficient, which is undesirable, and EV
When the VA% of A is 10% or more, the EVA resin is 70 parts or more, and the polyethylene resin with a specific gravity of 0.923 is less than 5 parts, if the amount applied is small, the rigidity will be insufficient and the molding will not have good shape retention. If the amount of inorganic filler is less than 10 parts, the cost reduction effect will be small, which is not preferable.

<Function> The EVA resin used in this invention has the effect of improving the weldability of felt compared to conventionally used low-density polyethylene. Polyethylene, polypropylene, or a copolymer resin thereof having a specific gravity of 0.923 or more, alone or in combination, has the function of compensating for and improving the lack of rigidity caused by the use of EVA resin. Inorganic fillers have a cost-reducing effect.

For attachment to the back surface of the carpet, melt coating is generally performed using an extruder equipped with a T-die. It is preferable to use an inorganic filler such as rhusium carbonate by mixing a masterbatch produced by kneading polyethylene wax or atactic polypropylene resin with other resins, or by mixing a surface-treated inorganic filler with the resin.

<Example-1> VA% is 6% (7) 50 parts of EVA resin Specific gravity is 0.945
10 parts medium density polyethylene resin, 50% polyethylene wax, 50% atactic polypropylene, 20% resin.
Mix 40 parts of a rhusium carbonate masterbatch made by kneading 80% rhusium carbonate and apply it to the back side of a patterned needle carpet made of 460 g/m2 of polyester cotton using an extruder equipped with a T-die. An automobile carpet was obtained by melt-coating the back side of the gray fabric, which had been coated with Enlatex at a dry weight of 120 g/nf and dried, at a coating weight of 400 g/m. This material is cut to a predetermined length, the resin on the back is melted in a heat furnace, and immediately placed between the upper and lower molds for press molding.Then the outer periphery is cut and the jig is attached. The product was made into a molded car mat for automobiles. This product was a good fit for the car.

In addition, the weldability of the felt was good, and the cold resistance of the carpet was superior to that of conventional carpets containing the same amount of lucium carbonate masterbatch.

<Example-2> VA content 6% (7) 50 parts of EVA resin 15 parts of polypropylene copolymer resin with a softening point of 120'C Styrene-butadiene latex was coated and dried on the back side of the needle carpet using an extruder equipped with a T-die, and a melt coating process of 400 g/m2 was performed on the back side.

A molded carpet for automobiles was manufactured using the same method as in Example-1, and its quality was higher than that of the conventional one made by blending the same amount of Carvet with low-density polyethylene. It was excellent in terms of properties and shape retention.

The cold resistance according to the method of Example 1 was 70 cm, and the felt welding limit time was 28 seconds.

Effects of the Invention> Cold resistance and felt welding properties were improved compared to conventional polyethylene blended with inorganic fillers, and costs were further reduced.

Comparative Example> The resin composition of the back side of the carpet in Example-1 has a specific gravity of 0.
．． 40 parts of Calpet A was blended with 60 parts of low-density polyethylene 916 and melt-coated on the back side of the carpet using an extruder equipped with a T-die. This carpet was subjected to cutting, heating, pressing, etc. in the same manner as in the examples. During this process, there were some areas where the felt was insufficiently welded.

Although the carpet was molded by raising the temperature, the carpet shrank and the dimensions were insufficient, resulting in a defective product. The cold resistance of this carpet is 40cm
, the felt welding limit time was 21 seconds.

<Effects of the Invention> Cold resistance, felt weldability, and shape retention were improved compared to conventionally used polyethylene blended with inorganic fillers.

Claims (1)

[Claims] (1) 30-70 parts of ethylene/vinyl acetate resin containing 5-10% vinyl acetate, polyethylene or polypropylene with a specific gravity of 0.923 or more, 5-20 parts of these copolymer resins alone or in combination, and inorganic filler 10-40
A resin composition containing 30% of
An automobile carpet characterized by being coated with 0-1000g/m^2.