JPH0371980B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is an ethylene-vinyl acetate copolymer (hereinafter referred to as
(abbreviated as EVA) or a woven or knitted fabric made of a composition containing EVA and polyethylene as the main components, combined with a rubber component, an adhesive resin, a flame retardant, and a processability improver selected from fatty acid amide, polyethylene glycol, and hydrogenated castor oil. This relates to laminated materials for the interior of vehicles, etc., which have been exposed to the elements, and the purpose is to obtain interior materials that prevent air permeability without impairing the texture of woven or knitted materials and workability during interior decoration. . In recent years, the skin of interior materials such as ceilings, seats, and door trims of automobiles and other vehicles has been designed to give a sense of luxury.
Alternatively, in order to improve livability, woven or knitted fabrics such as polyester tricot are increasingly being used. However, since woven and knitted fabrics are breathable, they act as a filter and have the problem of being very easily contaminated. As a method for preventing the breathability of woven and knitted fabrics, backing with plastic sheets has been considered and is currently being used in some cases, but this has not always been satisfactory. The performance required for a backing material is to adhere well to woven or knitted fabrics, and not to impair the texture of woven or knitted fabrics, that is, to have good strength, flexibility, elasticity, heat resistance, and workability during interior decoration. Furthermore, an essential condition is that it has flame retardancy. Specifically, what is currently being used is:
One example is the backing of polyvinyl chloride sheets, but since polyvinyl chloride does not adhere well to woven or knitted fabrics, adhesives must be used. Furthermore, it has the disadvantage of impairing the feel of woven and knitted fabrics due to problems such as elasticity. Furthermore, in recent years there have been calls for automobiles to be made lighter in order to improve fuel efficiency, but polyvinyl chloride has a high specific gravity as a plastic material.
There are also problems in terms of reducing the weight of automobiles. Also, backing of acrylic resin emulsion has been considered, but since it is an emulsion, there is a problem in that it must be backed with a considerable thickness in order to prevent air permeability. The present inventors have conducted repeated research to develop a material that satisfies all of the above performance as a bucking material.
First, EVA or EVA and polyethylene are the main components, adhesive resin, flame retardant and fatty acid amide,
An interior material that prevents air permeability without impairing the texture of woven or knitted fabrics or workability during interior decoration by using a composition containing a processability improver selected from polyethylene glycol and hydrogenated castor oil as a backing material. A patent has been applied for. (JP 58-162344) Although the present invention has superior characteristics compared to polyvinyl chloride and acrylic emulsion, it cannot necessarily be said that it has sufficient performance. Therefore, the present inventors conducted further intensive research and arrived at the present invention. That is, the present invention
Contains EVA or up to 30% polyethylene by weight
Consisting of EVA, the vinyl acetate content contained in the whole is 5 to 30% by weight, the resin component is 40 to 94% by weight,
Rubber component 3-30% by weight, ring and ball softening point 95-140℃
3 to 30% by weight of a tackifying resin, a flame retardant with a melting point of 90°C or higher, or a ring and ball softening point of 95°C or higher, based on the total amount of the resin component, rubber component, and tackifying resin.
Contains 0.05 to 2% by weight of a processability improver selected from ~50% by weight fatty acid amide, polyethylene glycol, and hydrogenated castor oil based on the total amount of the resin component, rubber component, and tackifying resin, and has a melt flow rate of 2. This is a laminate material for the interior of a vehicle, etc., which is made by backing a composition characterized in that the amount is 100 g/10 minutes onto a woven or knitted fabric with a thickness in the range of 20 to 150 μm. To describe the present invention more specifically, the physical properties of EVA or a mixture of EVA and polyethylene, which is the main component of the backing material of the present invention, vary greatly depending on the vinyl acetate content contained therein, and exhibit the characteristics of the present invention. In order to achieve this, products with a specific vinyl acetate content must be used.
-30% by weight, preferably 7-25% by weight. If the vinyl acetate content is less than 5% by weight, adhesion to woven or knitted fabrics will be poor, flexibility,
It is not preferable because it reduces elasticity and workability during interior decoration. In addition, when the vinyl acetate content is 30% by weight or more, the adhesion to woven or knitted fabrics, flexibility,
Although it has good elasticity and workability during interior decoration, it has no heat resistance, so it soaks into textiles and knitted fabrics at high temperatures, making them unfavorable. Also, the ratio of EVA and polyethylene is EVA100 to 70.
It is 0 to 30% by weight of polyethylene. If the polyethylene content is 30% by weight or more, flexibility, elasticity, and workability during interior decoration will be reduced, which is not preferable. Polyethylene here refers to low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, etc.
Preferably it is low density polyethylene. The rubber component is an essential component for the purpose of adding flexibility and heat resistance. Specifically, the rubber component is a homopolymer obtained by polymerizing natural rubber and/or a diene monomer and/or a diene monomer. Copolymers of monomers and copolymerizable monomers and/or olefin elastomers, such as butadiene rubber, chloroprene rubber, isoprene rubber, styrene-butadiene copolymers, styrene-butadiene-styrene block copolymers, Examples include styrene-isoprene copolymer, styrene-isoprene-styrene block copolymer, acrylonitrile-butadiene copolymer, ethylene-propylene rubber, etc., and one type or a mixture of two or more of these can be used.
The proportion of the rubber component is 3 to 30% by weight, preferably 5 to 20% by weight, based on the total amount of the resin component and the tackifying resin rubber component. If the proportion of the rubber component is less than 3%, flexibility and heat resistance cannot be said to be perfect. Also
If it exceeds 30% by weight, it is not preferable because not only the adhesion to woven or knitted fabrics decreases, but also the processability during backing processing is reduced. The tackifying resin is an essential component for the purpose of adding adhesion and flexibility to woven or knitted fabrics. Specifically, tackifying resins include polymerized rosin, hydrogenated rosin, modified rosin or rosin derivatives such as rosin ester, terpene resin, modified terpene, aliphatic hydrocarbon resin, aromatic hydrocarbon resin, and alicyclic resin. Examples include hydrocarbon resins, which can be used singly or as a mixture of two or more, but it is essential to use one having a ring and ball softening point of 95 to 140°C.
In other words, if the ring and ball softening point is 95° C. or lower, it is undesirable because it will not have heat resistance and will soak into woven or knitted fabrics at high temperatures, thereby making them breathable. Furthermore, if the ring and ball softening point is 140° C. or higher, the compatibility with the resin component will be lowered, resulting in lowered strength, flexibility, elasticity, and workability during interior decoration, which is not preferable. The proportion of the tackifying resin is 3 to 30% by weight, preferably 5 to 20% by weight, based on the total amount of the resin component, the rubber component, and the tackifying resin. The proportion of the tackifying resin is 3% or less,
This is undesirable because it reduces the adhesion to woven or knitted fabrics. Moreover, if it is 30% by weight or more, not only is no improvement in adhesion to woven or knitted fabrics observed, but rather problems such as a decrease in compatibility with the resin component and a decrease in processability during backing processing are preferable. do not have. Interior materials for vehicles such as automobiles must pass flame retardant standards (MVSS.NO.302) from the standpoint of respecting human life, and the laminate material of the present invention must also pass flame retardant standards. For this purpose, it is necessary to make the woven or knitted fabric flame retardant, but unless the backing material is made flame retardant, it will be difficult for the laminated material to pass the flame retardant standards. Therefore, a flame retardant is an essential component in the present invention. Here, the flame retardant must be selected to have heat resistance, and must have a melting point of 90°C or higher or a ring and ball softening point of 95°C or higher. Specific flame retardants include chlorinated paraffin, chlorinated polyethylene, perchloropentacyclodecane, hexabromobenzene, pentabromoethylbenzene,
Tetrabromobisphenol A, tetrabromophthalic anhalide, tetrabromophosphoric anhalide, hexabromodiphenyl ether, pentabromodiphenyl ether, decabromodiphenyl ether, tris(2,3-dibromopropyl)isocyanurate , 2,2-bis(4-hydroxyl 3,5-dibromophenyl)
Examples include propane, ethylene bistri(2-cyanoethyl)phosphonium bromide, aluminum hydroxide, etc., and these can be used alone or in a mixture of two or more. Further, when these flame retardants and antimony trioxide are used in combination, the flame retardant effect is further improved. In addition, the amount of flame retardant added is 3% to the total amount of the resin component, rubber component, and tackifying resin.
-50% by weight, preferably 4-40% by weight. 3
If it is less than % by weight, the flame retardant effect will not be improved, which is not preferable. Moreover, the flame retardant effect is sufficient at 50% by weight, and there is no need to add more than that. The processability improver in the present invention serves to prevent blocking of products, improve slip properties, etc., and is an essential component of the composition of the present invention. Specifically, processability improvers include fatty acid amides such as oleic acid amide, stearic acid amide, erucic acid amide, polyethylene glycol, hydrogenated castor oil, etc. One type or a mixture of two or more of these can be mentioned. Can be used.
The amount of these processability improvers added is from 0.05 to the total amount of the resin component, rubber component, and tackifying resin.
2% by weight, preferably 0.1-1% by weight. If the amount added is less than 0.05% by weight, the effect of the addition will be small and the effect as a processability improving agent will not be exhibited, which is not preferable. If it exceeds 2% by weight, it is not preferable because the adhesion strength to woven or knitted fabrics decreases. In the present invention, the melt flow rate of the composition must also be specified. The melt flow rate of the composition is measured by the melt flow rate measurement method specified in JISK6730, and the value is 2 to 2.
100 g/10 minutes, preferably in the range of 5 to 60 g/10 minutes. If the melt flow rate is 2 g/10 minutes or less, adhesion to woven or knitted fabrics will be poor, and flexibility, stretchability, and workability during interior decoration will be impaired, which is not preferable. Moreover, if it exceeds 100g/10 minutes, the heat resistance will decrease and it cannot be used. Furthermore, in the present invention, when backing the composition onto a woven or knitted fabric, the thickness of the composition must be specified. The thickness of the composition is 20-150μ
If the thickness is less than 20 μm, the air permeability prevention effect will be weakened due to pinholes in the composition sheet, which is not preferable. Moreover, if it is 150 μm or more, the flexibility and stretchability of the woven or knitted fabric and the workability during interior decoration are impaired, which is not preferable. The composition of the present invention can be easily produced by pre-mixing predetermined amounts of the components in a solid state and then melting and shear-mixing them in a heated roll, Hanbury mixer or extruder. Further, an antioxidant such as 2,6-di-t-butyl para-cresol may be added as necessary. In the present invention, backing of the woven or knitted fabric is carried out by first producing a sheet of the composition by the inflation method, T-die method, calendar method, etc. that are generally used in the industry, and then applying this sheet to the fabric by thermal lamination, heat treatment, etc. It can be obtained by bonding using means such as pressing. Alternatively, it can also be obtained by directly backing the composition onto a woven or knitted fabric by extrusion lamination. The extrusion lamination method is a simpler method because backing can be performed in one step. A laminate material for interior decoration made by backing a woven or knitted fabric with the composition of the present invention can prevent the breathability of the woven or knitted fabric without impairing the feel of the woven or knitted fabric or the workability during interior decoration. Moreover, since backing can be performed using commonly used processing methods, an extremely effective laminated material can be provided. Another feature of the composition according to the present invention is that it can be welded. The present invention will be specifically explained below using Examples. Example 1 20% by weight of vinyl acetate, 75% by weight of EVA, 10% by weight of ethylene-propylene rubber (product name: JSREP-02P), aliphatic cyclic hydrocarbon resin (product name: Alcon P-125) with a ring and ball softening point of 125°C. 10% by weight of tetrabromobisphenol A having a melting point of 180° C. and 0.2% by weight of erucic acid amide were mixed with respect to the total amount of these materials, and the mixture was kneaded and extruded using an extruder to form pellets.
The melt flow rate of this pellet is 28g/10
It was hot in minutes. This composition was applied to a cylinder with a diameter of 115 mm.
L/D=25, using an extruder with a straight manifold die (resin temperature 240℃, take-off speed 20m/min)
Backing was performed on polyester tricot to a thickness of 50 μm. Example 2 The composition of Example 1 was used in a cylinder with a diameter of 40 mm and L/D.
A casting film of 50 μm was obtained using an extruder of 22 mm. This film was bonded under heat using a thermal laminator (pressing temperature: 130°C, line speed: 5 m/min) to back the polyester tricot. Example 3 As a rubber component, a styrene-butadiene-styrene block copolymer (trade name Cauliflex) was used.
Pelletization was carried out in the same manner as in Example 1, except that TR-KX-65) was used. The melt flow rate of this pellet was 18 g/10 minutes.
This composition was subjected to bagging in the same manner as in Example 1. Comparative Example 4 Pelletization was carried out in the same manner as in Example 1, except that the tackifying resin used in Example 1 was used in an amount of 2% by weight. The melt flow rate of this pellet is
It was 16g/10 minutes. This composition was subjected to bagging in the same manner as in Example 1. Example 4 Pelletization was carried out in the same manner as in Example 1 except that 70% by weight of EVA containing 28% by weight of vinyl acetate and 15% by weight of low density polyethylene having a density of 0.921 were used. The melt flow rate of this pellet was 25 g/10 minutes. This composition was subjected to backing in the same manner as in Example 1. Example 5 Pelletization was carried out in the same manner as in Example 3 except that tetrabromodiphenyl having a melting point of 301°C was used as the flame retardant. The melt flow rate of this pellet was 18 g/10 minutes. This composition was subjected to backing in the same manner as in Example 1. Comparative Example 1 Pelletization was carried out in the same manner as in Example 1 except that EVA containing 35% by weight of vinyl acetate was used. The melt flow rate of this pellet was 50 g/10 minutes. This composition was subjected to backing in the same manner as in Example 1, except that the resin temperature during processing was 160°C. Comparative Example 2 Pelletization was carried out in the same manner as in Example 1, except that an alicyclic hydrocarbon resin (trade name Alcon P-70) with a ring and ball softening point of 70° C. was used as the tackifying resin.
The melt flow rate of this pellet was 27 g/10 minutes. This composition was subjected to bagging in the same manner as in Example 1. Comparative Example 3 Pelletization was carried out in the same manner as in Example 1 except that the flame retardant used in Example 1 was used in an amount of 2% by weight. The melt flow rate of this pellet was 28 g/10 minutes. This composition was subjected to bagging in the same manner as in Example 1. Comparative Example 5 Backing was carried out in the same manner as in Example 1 except that the backing thickness was 200 μm. The evaluation of the laminate materials described in Examples and Comparative Examples is shown in the table below.

【table】

【table】

Claims (1)

[Claims] 1 consisting of ethylene-vinyl acetate copolymer or ethylene-vinyl acetate copolymer containing up to 30% by weight of polyethylene, the total vinyl acetate content of which is 5%.
~30% by weight resin component 40-94% by weight, rubber component 3
~30% by weight, 3 to 30% by weight of a tackifying resin with a ring and ball softening point of 95 to 140°C, and a flame retardant with a melting point of 90°C or higher or a ring and ball softening point of 95°C or higher, to the resin component, the rubber component, and the tackifier. 3 to 50% by weight based on the total amount of resin,
Add a processability improver selected from fatty acid amide, polyethylene glycol, and hydrogenated castor oil to 0.05% of the total amount of the resin component, rubber component, and tackifying resin.
Contains ~2% by weight, melt flow rate is ~2
100g/10min.
A laminated material for the interior of vehicles, etc., made by backing a woven or knitted fabric with a thickness in the range of ~150 μm.