JPH0120063B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention uses a specific ethylene-vinyl acetate copolymer (hereinafter abbreviated as EVA) or a specific EVA and polyethylene as main components, a specific tackifying resin, a specific flame retardant, a fatty acid amide, polyethylene glycol, and hydrogenated castor oil. A composition containing one or more processability improvers selected from
This relates to a laminated material for the interior of vehicles, etc., which is coated with a flame-retardant woven or knitted fabric, and its purpose is to ventilate the woven or knitted fabric without impairing its texture or the workability of the interior. The object of the present invention is to obtain an interior material that prevents corrosion. In recent years, the surface 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 filters and have the problem of being very easily soiled. 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 as a bucking material is that it adheres well to woven and knitted fabrics, and that it does not impair the texture of woven or knitted fabrics, that is, it has good strength, flexibility, elasticity, heat resistance, and workability during interior decoration. In addition, it must have flame retardancy, etc. as essential conditions. Specifically speaking, what is currently being used is polyvinyl chloride sheet backing, but since polyvinyl chloride does not have adhesive properties with woven or knitted fabrics, an adhesive 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 has been a call for the weight of automobiles to be reduced in order to improve fuel efficiency, but polyvinyl chloride has a high specific gravity as a plastic material, and this poses a problem in terms of reducing the weight of automobiles.
Also, backing of acrylic resin emulsion has been considered, but since it is an emulsion, it has the problem that backing must be considerably thick to prevent air permeability. The present inventors have conducted extensive research to develop a material that satisfies all of the above-mentioned properties as a bucking material, and as a result, they have arrived at the present invention. That is, the present invention consists of EVA or an ethylene vinyl acetate copolymer containing up to 30% by weight of polyethylene, and the vinyl acetate content contained in the whole is 5 to 25% by weight of the resin component, 70 to 97% by weight of the ring and ball method. Softening point 95~140℃
3 to 30% by weight of a tackifying resin, 10 to 50% by weight of 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 and the tackifying resin, fatty acid amide, polyethylene. A composition comprising 0.05 to 2% by weight of a processability improver selected from glycol and hydrogenated castor oil based on the resin component and the tackifying resin, and having a melt index of 2 to 100 g/10 minutes. This is an interior laminate material for vehicles, etc., made by backing a woven or knitted fabric with flame retardant treatment of 20 to 150 microns. To describe the present invention more specifically, the main component of the backing material of the present invention is
The physical properties of EVA or a mixture of EVA and polyethylene vary greatly depending on the vinyl acetate content contained therein, and in order to exhibit the characteristics of the present invention, it is necessary to have a vinyl acetate content within a specific range.
Specifically, the vinyl acetate content is limited to 5 to 25% by weight, preferably 7 to 15% by weight. If the vinyl acetate content is less than 5% by weight, it is not preferable because adhesion to woven or knitted fabrics deteriorates, flexibility, stretchability, and workability during interior decoration decrease. In addition, if the vinyl acetate content is 25% by weight or more, it has good adhesion to woven and knitted fabrics, flexibility, stretchability, and workability during interior decoration, but it does not have heat resistance and will soak into woven and knitted fabrics at high temperatures. This is not preferable because it has the problem that it bulges and creates air permeability. Also
The ratio of EVA to polyethylene is 100 to 70% by weight of EVA and 0 to 30% by weight of polyethylene. If the polyethylene content is 30% by weight or more, flexibility, elasticity,
This is not preferable because it reduces workability during interior decoration. The polyethylene referred to here is low-density polyethylene.
Either medium-density polyethylene or high-density polyethylene may be used, but low-density polyethylene is preferred. The tackifying resin is an essential component for 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, alicyclic carbonized resin. Examples include hydrogen resins, which can be used alone or in a mixture of two or more, but it is essential to use one having a ring and ball softening point of 95°C to 140°C. That is, if the ring and ball softening point is 95° C. or lower, it is not preferable because it has no heat resistance and will soak into woven or knitted fabrics at high temperatures, resulting in poor air permeability. Furthermore, if the ring and ball softening point is 140° C. or higher, the compatibility with the resin component decreases, resulting in a decrease in strength, flexibility, elasticity, and workability during interior decoration, which is not preferable. In addition, the composition ratio of the tackifying resin to the resin component is 75 to 97.
It is 3 to 30% by weight, preferably 5 to 20% by weight. If the amount of the tackifying resin is 3% by weight or less, the adhesion to woven or knitted fabrics becomes poor, which is not preferable. Moreover, if it exceeds 30% by weight, 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. Automotive interior materials must pass flame retardant standards (MVSS, No. 302) from a standpoint of respecting human life, and the laminate material of the present invention must also pass flame retardant standards. To this end, it is naturally necessary to make the woven or knitted material flame retardant, but unless the backing material is made flame retardant, it will be difficult to pass the flame retardant standards as a laminated material. Therefore, a flame retardant is an essential component in the present invention. Here, the flame retardant must be heat resistant like the tackifying resin component, and must have a melting point of 90°C or higher or a ring and ball softening point of 95°C or higher. Specifically speaking, flame retardants include chloroparaffin, chloropolyethylene,
Perchloropentacyclodecane, hexabromobenzene, pentabromoethylbenzene, tetrabromobisphenol A, tetrabromophthalic anhalide, tetrabromophosphoric anhalide, hexabromodiphenyl ether, pentabromodiphenyl ether, decabromodif Enyl ether tris(2,3-di-bromopropyl) isocyanurate, 2,2-bis(4-hydroxy-3,5-dibromophenyl)propane, ethylene bistri(2-cyanoethyl)phosphonium bromide, aluminum hydroxide, etc. ,
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.
Further, the amount of flame retardant added is 10 to 50% by weight, preferably 20 to 40% by weight, based on the total amount of the resin component and the tackifying resin.
Weight%. If it is less than 10% by weight, the flame retardant effect will not be improved, which is not preferable. Also 50% by weight
The flame retardant effect is sufficient and there is no need to add more. The processability improver in the present invention serves to prevent blocking, improve slip properties, and processability of the product, and is an essential component of the composition of the present invention. Specifically, fatty acid amides such as oleic acid amide, stearic acid amide, erucic acid amide, polyethylene glycol,
Examples include hydrogenated castor oil, and these can be used alone or as a mixture of two or more. The amount of these processability improvers added is 0.05 to 2% by weight, preferably 0.1 to 1% by weight, based on the total amount of the resin component and the tackifying resin. If the amount added is less than 0.05% by weight, the effect of the addition will be small, and if it is more than 2% by weight, the adhesion strength to the woven or knitted fabric will decrease, which is not preferable. In the present invention, the melt index of the composition must also be specified. The melt index of the composition is 2, as measured by the melt index measurement method specified in JISK-6730.
~100 g/10 minutes, preferably 5-60 g/10 minutes. If the melt index is less than 2 g/10 minutes, it cannot be used because it has poor adhesion to woven or knitted fabrics, impairing flexibility, stretchability, and workability during interior decoration. Moreover, if it is more than 100 g/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 in the range of 20 to 150 microns, and if it is less than 20 microns, the effect of preventing air permeability will be diminished due to pinholes, etc. in the composition sheet. Moreover, if it is 150 microns or more, it cannot be used because the flexibility and stretchability of woven or knitted fabrics and workability during interior decoration are impaired. 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, Banbury mixer or extruder. Further, an antioxidant such as 2-6 di, t-butyl para-cresol may be added if necessary. In the present invention, a sheet of the composition is prepared in advance by an inflation method, a T-die method, a calendar method, etc. which are generally used in the industry, and this sheet is subjected to a flame retardant treatment. It can be obtained by laminating a woven or knitted fabric using means such as thermal lamination or heat pressing. Alternatively, it can also be obtained by directly backing the composition onto a flame-retardant 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 coating a woven or knitted fabric treated with a flame retardant composition according to the present invention prevents the breathability of the woven or knitted fabric without impairing the texture of the woven or knitted fabric or workability during interior decoration. It is possible to provide a very effective laminate material because it can be processed using commonly used processing methods. Another feature of this interior material is that it can be welded. The present invention will be specifically explained below using Examples. Example 1 10% by weight of vinyl acetate, 85% by weight of EVA, 15% by weight of alicyclic hydrocarbon resin (trade name Alcon P-125) with a ring and ball softening point of 125°C, and tetrabromobisphenol A ( (melting point 180℃) 30% by weight, antimony trioxide (melting point 656℃) 10% by weight,
0.3% by weight of erucic acid amide was mixed and kneaded and extruded using an extruder to form pellets. The melt index of this pellet was 15 g/10 minutes. This composition was prepared using a cylinder with a diameter of 115 mm, L/D=
25. Using an extruder equipped with a straight manifold die (resin temperature: 250°C, withdrawal speed: 20 m/min), polyester tricot was backed to a thickness of 50 microns. Example 2 The composition of Example 1 was used in a cylinder with a diameter of 40 mm L/D.
= 22 extruder (resin temperature 140℃ take-up speed 10
m/min) 50 micron inflation film was obtained. Heat and press this film using a thermal laminator (pressing temperature: 130℃, line speed: 10
The polyester tricot was subjected to backing by the following steps (m/min). Example 3 Pelletization was carried out in the same manner as in Example 1, except that an aliphatic hydrocarbon resin (trade name Escolette 5300) having a ring and ball softening point of 105° C. was used as the tackifying resin. The melt index of this pellet is 14.5
g/10 minutes. This composition was subjected to backing in the same manner as in Example 1. Example 4 EVA 70% density by weight with 20% vinyl acetate content
Pelletization was carried out in the same manner as in Example 1 except that 15% by weight of 0.921 low density polyethylene was used. The melt index of this pellet was 25.0 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 1 except that 25% by weight of tetrabromodiphenyl ether with a melting point of 301°C and 12% by weight of antimony trioxide were used as flame retardants. The melt index of this pellet is
It was 13.5g/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 30% by weight of vinyl acetate was used. The melt index of this pellet was 43 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 165°C. Comparative Example 2 Pelletization was carried out in the same manner as in Example 1 except that an aliphatic hydrocarbon resin (trade name Alcon P-70) having a ring and ball softening point of 70°C was used as the tackifying resin. The melt index of this pellet is 16.3
g/10 minutes. This composition was subjected to bagging in the same manner as in Example 1. Comparative Example 3 Example 1 except that the tackifying resin used in Example 1 was 2% by weight and the flame retardant used in Example 1 was 7% by weight.
It was made into pellets in the same way. The melt index of this pellet was 17 g/10 minutes. This composition was packaged in the same manner as in Example 1. Comparative Example 4 Vinyl acetate content 15% by weight, pellet melt index 120g/10 minutes, resin temperature during processing
Pelletization and bagging was carried out in the same manner as in Example 1 except that the temperature was 160°C. Comparative Example 5 Backing was carried out in the same manner as in Example 1 except that the backing thickness was 200 microns. Evaluations of the laminates described in Examples and Comparative Examples are shown in the table below.

[Table] From this table, it can be seen that the laminated materials described in Examples have the performance required for interior use in vehicles and the like.

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%.
~25% by weight resin component 70-97% by weight, 3-30% by weight tackifying resin with ring and ball softening point 95-140°C, melting point
Add a flame retardant with a softening point of 90℃ or higher or a ring and ball softening point of 95℃ or higher to 10% of the total amount of the resin component and the adhesive resin.
~50% by weight, contains 0.05~2% by weight of a processability improver selected from fatty acid amide, polyethylene glycol, and hydrogenated castor oil based on the resin component and the tackifying resin, and has a melt index of 2~100g/10
An interior laminate material for vehicles, etc., which is made of a woven or knitted fabric that has been flame-retardant treated with a composition characterized in that it has a thickness of 20 to 150 microns.