JPS5817028B2 - Glass Seni no Kakohou - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for processing glass fibers.

Recently, the demand for glass fibers has been increasing because of the shortage of natural and synthetic fibers and because of their heat resistance and nonflammability.

Glass fibers are used as woven fabrics for curtains, rugs, etc., but they are also processed into resin and made into reinforced plastics for use in small ships, car bodies, buoys, joints, flame-retardant hats, etc.

All of these are made of hard resin.

Soft resins have only been used in automobile tires to a certain extent, and until now there have been almost no beautiful colored or transparent ones.

This is because there is less flexible resin that adheres to the glass.

Glass fiber woven fabric coated with resin has been known for some time, but this fabric has the disadvantage of poor flexibility.

For this reason, it has been considered to process resin into non-woven fabrics made of short glass fibers or thin woven fabrics with coarse textured fibers, but the problem remained that the resin could not be applied uniformly.

The present invention is aimed at solving the above-mentioned problems and provides a method for easily and uniformly applying a soft resin.

The inventor conducted research in search of a resin that has physical strength, melts easily when heated, is flexible, and adheres well to glass fibers, and as a result, discovered ethylene-vinyl acetate copolymer (hereinafter referred to as EVA). The present invention was completed by discovering that a composition consisting of a petroleum resin and a petroleum resin satisfies the above requirements.

In the present invention, 90 to 60 parts of EVA and 10 to 10 parts of petroleum resin are prepared in advance.
A coloring agent, an appropriate amount of an extender, etc. are added as necessary to the composition consisting of 40 parts, and the mixture is heated and mixed uniformly, and a thin resin film is produced using a film manufacturing machine using a melting method.

Next, as shown in the figure, a non-woven fabric or a thin woven fabric made of glass fibers 2 is placed on top of the stainless steel belt 3, the resin film 1 is layered on top of the non-woven fabric or a thin woven fabric, and the belt 3 is sent into the heating chamber 4. , the resin film 1 is heated to melt and adhere to the glass fibers 2.

Thereafter, this belt 3 is introduced into a cooling chamber 5, where it is cooled and solidified to obtain the desired glass fiber-containing resin door.

Note that this resin-treated sheet may be surface-treated by embossing or passing through a calender roll when it is semi-solidified, if necessary.

According to the method of the present invention, any short fiber nonwoven fabric, even an extremely thin woven fabric, can be resin-processed.

Moreover, with the present invention, the product can be easily obtained without the need for a coating machine or a dryer, and the product can be easily obtained without the need for a coating machine or a dryer.
There is no need to worry about fire or other pollution.

EVA used in the present invention is easiest to process if it has a vinyl acetate content of about 30 parts, but it may have a lower content in order to obtain the physical strength of the product.

Further, the petroleum resin is preferably an aromatic olefin type.

When carrying out the process, as shown in the figure, the processing resin film 1
It is preferable to use a continuous method in which the glass fibers 2 and 2 are each formed into a roll and fed onto the belt 3 while being unwound.

In this case, it is convenient to use an endless belt 3.

Note that 6 in the figure indicates a roll.

When the non-woven fabric or woven fabric is thick, by placing the film 1 not only on top but also above and below the glass fibers 2, it is possible to obtain a film that is evenly adhered to the entire surface.

The surface of the belt 3 is preferably treated in advance with a release agent such as silicone resin.

The present invention will be explained below with reference to Examples.

Example 1 A nonwoven fabric (45 g/vi'') made by arranging glass fibers several centimeters long in a non-directional manner was used.

This nonwoven fabric had extremely low tensile strength and could not be subjected to continuous operations such as ordinary coating or dipping.

Processing was performed using a continuous working machine as shown in the figure.

Stainless steel belt 3 whose surface has been previously treated with silicone resin
The nonwoven fabric 2 is placed on top, the processing resin film 1 is placed on top of the nonwoven fabric 2, and the processing resin film 1 is sent to the heating chamber 4 together with the belt 3 for 80 to 10 minutes.
The resin film 1 was melted at 0° C. and adhered to the nonwoven fabric 2.

Note that the temperature of the heating chamber 4 is given a temperature gradient from 80°C to 100°C.

Next, this nonwoven fabric was sent to a cooling chamber at a temperature of 30° C. or lower, and was cooled and solidified to obtain a product sheet.

Embossing or calendering of the product sheet was carried out when the temperature of the sheet reached 40 to 50°C.

The product sheet thus obtained had a glossy surface and fair strength.

The processing film used here did not contain a filler and was made of 80 parts of BVA with a vinyl acetate content of 28% and 30 parts of an aromatic olefin petroleum resin.

The product obtained was therefore a transparent sheet.

Example 2 A sheet was made using a woven fabric (75 g/rag) made of thin glass fibers with processing resin films adhered to the top and bottom.

First, a resin film is placed on a stainless steel belt, a woven fabric is placed on top of it, and then a resin film is placed on top of that.

Next, these three layers are transferred to a heating chamber and bonded.
At this time, if there is air between the resin film and the woven fabric, air bubbles will remain inside the sheet even if they are bonded, so once the three sheets are stacked, immediately press rollers to make them adhere tightly to prevent air from entering, and then leave them in a heating room. Transfer and glue.

The heating temperature varies depending on the melting temperature of the resin, but in this example, it was heated at 100 to 150°C.

After this, move the glued sheet to a cooling room and heat it for 50 to 80 minutes.
The mixture was calendered or embossed at 30°C, and then cooled to 30°C or lower to obtain the desired glass fiber-containing sheet.

The processing resin film used in this example had a vinyl acetate content of 2
80 parts of 8% EVA and 20 parts of aromatic olefin petroleum resin
A small amount of filler is added to the part and melted by heating to obtain a thickness of Q, 1.
A 5 ut film was used.

The softening point of this product was about 120°C as determined by the fastball method.

The product obtained in this example is a strong opaque sheet that can be used for covers or packaging.

[Brief explanation of the drawing]

The figure is an explanatory diagram showing the steps of the present invention. In the figure, 1...Resin film, 2...Glass fiber, 3...Belt, 4...Heating chamber, 5...Cooling The room is shown.

Claims (1)

[Claims] 1. A method for processing glass fibers, which comprises stacking a film made of an ethylene-vinyl acetate copolymer and a petroleum resin on a nonwoven or woven fabric of glass fibers, heating and melting the film, and cooling the film.