JPH02307986A - Method for carrying out melt extrusion coating finish - Google Patents

Abstract

PURPOSE:To obtain a coating-finished cloth having excellent adhesion strength by previously applying a silane coupling agent to a synthetic fiber cloth and then extruding a thermoplastic resin in a melted state on the cloth and pressing the resin to the cloth. CONSTITUTION:Before subjecting a synthetic fiber cloth to melt extrusion coating finish, a silane coupling agent is previously applied to the synthetic fiber cloth using a padding method and a thermoplastic resin is extruded in a melted state on the synthetic fiber cloth by an extruder according to an ordinary method and pressed to the cloth by nip rolls to provide the melt extrusion coating-finished cloth having excellent adhesive strength. Furthermore, as the silane coupling agent, a compound having two or more different reaction groups, e.g. vinyltrimethoxysilane and vinyltrichlorosilane in a molecule can be exemplified.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method for melt-extrusion coating a thermoplastic resin onto a synthetic fiber fabric.

(Prior art) Melt extrusion coating is a well-known process in which thermoplastic resin is extruded in a molten state onto fabrics such as woven or knitted fabrics or non-woven fabrics and then pressure bonded, but the adhesive strength between the fabric and the resin is not strong enough. There are many cases. In order to overcome these drawbacks, a method has been considered in which an anchoring agent is applied to the fabric before melt extrusion coating, and organic titanium-based, isocyanate-based, polyethyleneimine-based, polybutadiene-based compounds, etc. are used as the anchoring agent. It has been known.

(Problems to be Solved by the Invention) In the conventional method as described above, even if an anchoring agent is applied to improve adhesive strength, the adhesive strength is insufficient and there are problems with the durability of the product.

The present invention eliminates these drawbacks of the prior art.

The object of the present invention is to obtain a melt-extrusion coated fabric having excellent adhesive strength.

(Means for Solving the Problems) In order to achieve the above object, the present inventors have made extensive studies and found that if a silane coupling agent is applied to a synthetic fiber fabric in advance before melt extrusion coating processing, melt extrusion The present invention was achieved by discovering the fact that the adhesive strength between the synthetic fiber fabric and the resin after coating is significantly improved.

That is, 1. The present invention is characterized in that: 1. During the melt extrusion coating process on a synthetic fiber fabric, a silane coupling agent is applied to the synthetic fiber fabric in advance, and then a thermoplastic resin is extruded in a molten state onto the fabric and crimped. The gist of this paper is a melt extrusion coating processing method.

The present invention will be explained in detail below.

Melt extrusion coating process involves melting a thermoplastic resin under heat and pressure in an extruder, extruding it in a molten state from a slit die onto a base fabric to be coated, pressing it, and applying the above-mentioned heat onto the base fabric. This is a coating processing method that forms a plastic resin layer.

Synthetic fibers in the present invention include polyester fibers (polyethylene terephthalate fibers, polyethylene terephthalate fibers copolymerized with isophthalic acid, paraoxybenzoic acid, sulfoisophthalic acid, butylene glycol, etc.), polyamide fibers (nylon-4 fibers, nylon −
6 fibers, nylon-66 fibers, nylon-610 fibers, nylon-11 fibers, etc.), polyacrylonitrile fibers, and polyolefin fibers (polyethylene fibers, polypropylene fibers, etc.). When these synthetic fibers are mixed with other fibers (cotton, wool, rayon, acetate, etc.), they must contain 60% or more of the above synthetic fibers alone or in combination with two or more types of composite fibers. . The term "fabric" used in the present invention refers to a 1-meter woven fabric, a nonwoven fabric, and the like.

In the method of the present invention, first, a silane coupling agent is applied to the fabric made of the above-mentioned synthetic fiber in advance during the melt extrusion coating process. The silane coupling agent herein is a general term for organosilicon monomers having two or more different reactive groups in their molecules, and the nine reactive groups include methoxy group, ethoxy group, silanol group, vinyl group, One example of those having an epoxy group, methacrylic group, amino group, mercapto group, etc. is vinyl) IJ methoxysilane.

γ-glycidoxypropyltrimethoxysilane.

Examples include vinyltrichlorosilane and T-aminopropyltriethoxysilane. In the method of the present invention,
One type of silane coupling agent may be used alone, or two or more types may be used in combination.

The method for applying the silane coupling agent to the synthetic fiber fabric may be any one of padding, spraying, coating, and the like.

The amount of silane coupling agent applied varies depending on the type of silane coupling agent, so it is necessary to determine it by experiment prior to processing.

After applying the silane coupling agent, in the present invention, a thermoplastic resin is extruded in a molten state onto the fabric and pressure bonded. The thermoplastic resin used here includes hydrocarbon resins (polyethylene, polypropylene, etc.).

Polymethylpentene, polybutene, polybutadiene, polystyrene, etc.), polar vinyl resins (polyvinyl chloride,
polyvinyl acetate, polymethyl methacrylate, polyvinylidene chloride, polytetrafluoroethylene, etc.), other resins (polyacetal).

Polyamide, polycarbonate, polyphenylene oxide, polyethylene terephthalate, polybutylene terephthalate, polyarylate, polysulfone, polyurethane, polyether sulfone.

Polyimide, polyamideimide, polyphenylene sulfide, etc.) may be used alone or as a mixture of two or more thereof, as well as copolymers. What is the molten state?

It is sufficient if the thermoplastic resin is heated to a temperature equal to or higher than its melting point and melted to the extent that it can be extruded with an extruder.

In the method of the present invention, a thermoplastic resin is extruded in a molten state onto two synthetic fiber fabrics and crimped according to the conventional method of melt extrusion coating processing. During extrusion and pressure bonding, a sheet-like thermoplastic resin extruded in a molten state is pressed onto a synthetic fiber fabric under pressure. In this way, the synthetic fiber fabric and the thermoplastic resin are bonded together, and the processing of the present invention is completed.

The extruder and T-die used in the method of the present invention may be those used in ordinary melt extrusion coating processing.

The present invention has nine or more configurations.

(Function) In the method of the present invention, when applying melt extrusion coating to synthetic fiber fabric, a silane coupling agent is applied to the synthetic fiber fabric in advance, and then a molten thermoplastic resin is extruded onto the fabric and crimped. It is believed that the silane coupling agent added to the synthetic fiber fabric with the following structure plays some role in improving the adhesion between the synthetic fiber fabric and the thermoplastic resin, but the mechanism of action is currently unknown. Details are unknown.

(Example) Next, the present invention will be explained in more detail with reference to Examples. The performance of the processed cloth was measured by the following method.

[Strong peeling]

A sample piece with a width of 25 cm was pulled at a speed of 300 mm/min.

Peel strength when peeling off at a 90° angle.

It was measured using Tensilon manufactured by Shimadzu Corporation.

Example 1 Nylon taffeta (warp 70d/12f, weft 70d/
24f, warp density 100 pieces/inch, weft density 90 pieces/inch
After scouring and dyeing, the fabric was impregnated with a 1% aqueous solution of T-aminopropyltriethoxysilane at a pickup rate of 40%, and dried at 110°C to obtain a coated fabric.

Next, using an extruder, Mirason 1OP (polyethylene manufactured by Mitsui Petrochemical Industries ■, melting point 106°C, density 0.917 g/C11) was extruded from a T-die (800 mm width, single manifold type die) at an extrusion temperature of 315°C. After extruding onto the cloth to be coated, it is crimped with a nip roll consisting of a metal cooling roll and a silicone rubber-lined pressure roll, and wound up at a processing speed of 60 m/min to obtain the melt extrusion coated cloth of the present invention. I got it.

For comparison with the present invention 9 Melt extrusion for comparison was carried out in exactly the same manner as in this example except that impregnation of nylon taffeta with T-aminopropyltriethoxysilane (silane coupling agent) was omitted. A coated cloth was obtained.

The performance of the melt-extrusion coated fabrics of the present invention and comparative fabrics was measured, and the results are shown in Table 1.

As is clear from Table 1, the melt-extrusion coated fabric of the present invention has excellent adhesive strength.

Example 2 In the above Example 1, Rezamin P-1040 (polyurethane manufactured by Dainichiseika Chemical Co., Ltd., melting point 94°C, density 1.21 g/c1) was used in place of the extrusion coating resin Mirason 10P.
A melt-extrusion coated fabric of the present invention was obtained in exactly the same manner as in Example 1, except that the extrusion temperature was 170°C instead of 315°C.

Comparison with the present invention Approximately 9 Comparative samples were prepared in the same manner as in Example 2, except that impregnation of nylon taffeta with γ-aminopropyltriethoxysilane (silane coupling agent) was omitted in Example 2. A melt extrusion coated fabric was obtained.

The performance of the melt-extrusion coated fabrics of the present invention and comparative fabrics was measured, and the results are shown in Table 2.

As is clear from the results in Table 2, the coated fabric of the present invention provided with a silane coupling agent.

The adhesive strength was very good.

(Effects of the Invention) According to the method of the present invention: 1. In the melt extrusion coating process of a thermoplastic resin onto a synthetic fiber fabric.

It becomes possible to obtain a coated fabric with excellent adhesive strength.

Claims (1)

[Claims] (1) When performing melt extrusion coating on a synthetic fiber fabric, a silane coupling agent is applied to the synthetic fiber fabric in advance, and then a thermoplastic resin is extruded and crimped onto the fabric in a molten state. Extrusion coating processing method.