JPH03294587A - Flooring material - Google Patents

Abstract

PURPOSE:To obtain a durable flooring material having improved water-resistant adhesivity and impact resistance by slitting a waste tire to obtain long strips, arranging a plurality of the strips in parallel and bonding the strips with a backing cloth produced by applying a specific rubber cement to one surface of an RFL-treated organic fiber fabric. CONSTITUTION:The tire-side 4 of a waste tire 1 is spirally cut in circumferential direction of the tire and a surface of the obtained long strip is buffed to obtain a buffed strip 8. A plurality of the buffed strips are arranged in parallel, an adhesive is applied to the strips at the side opposite to the buffed side and the strips are bonded, through the adhesive, to a backing cloth 13 produced by applying 50-200g/cm<2> of preferably a sulfur-modified chloroprene rubber cement to an RFL-treated fabric made of a synthetic resin. The objective flooring material produced by the above process has excellent water-resistant adhesivity and dimensional stability and keeps the adhesive force even after application of shock.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The second invention relates to a flooring material using waste tires, and more specifically, it improves the adhesion between the strip material and the backing fabric, and also improves the impact resistance. It concerns improved flooring.

[Conventional technology]

Conventionally, in order to effectively utilize waste tires, the tire side part was cut in a spiral shape in the circumferential direction of the tire to form string-like strips, and a plurality of these strips were arranged in parallel with each other and attached to a backing cloth with an adhesive. Flooring materials that are bonded together have been proposed.

As the backing fabric for this flooring material, a fabric made of glass fabric and a chloroprene adhesive applied thereon is commercially available, but it has the following problems.

[Problem that the invention seeks to solve]

That is, when the flooring material gets wet, the interfacial adhesion between the glass fabric and the chloroprene adhesive decreases, resulting in a decrease in the adhesive strength of the strip, making it more likely to peel. Because of this, it is vulnerable to impact, and the glass fabric is destroyed by falling heavy objects, which not only deteriorates the adhesion between the floor surface and the flooring material, but also causes damage to the floor. Adhesion failure between the flooring material and the glass fabric also occurs, causing a decrease in the durability of the flooring material.

[Purpose of the invention]

This invention was devised by focusing on the conventional problem, and is a flooring material in which waste tires are cut into strips and adhered in parallel to a backing fabric, and the adhesive between the strip and the backing fabric is The purpose of this invention is to provide a highly durable flooring material with improved properties and impact resistance.

[Means to solve the problem]

In order to achieve the above object, this invention uses a backing cloth for flooring material.
The gist is that an organic fiber fabric is impregnated with resorcin formalin resin and rubber latex and heat treated, and then coated with chloroprene rubber cement on one side, and the amount of the rubber cement adhered is 50 g/rrr.
A backing cloth having a weight in the range of ~200 g/Po is used, and a backing cloth coated with rubber cement whose main component is sulfur-modified chloroprene rubber is used.

[Action of the invention]

By configuring the present invention as described above, it is possible to obtain a flooring material with good water-resistant adhesion and good adhesion after impact, as well as good dimensional stability and appearance.

The outline of this invention will be explained in detail below.

The organic fiber fabric used in the flooring material of this invention is formed from synthetic fibers such as nylon 6, nylon 66, polyester, and vinylon. The organic fibers used here are
This is because they are not destroyed like inorganic fibers such as glass fibers by impact on the flooring material.

On the other hand, the texture of the fabric, the density of the fabric, the fineness of the fibers used, etc. are not particularly limited.

For these organic fiber fabrics, nanlon or polyester fibers are usually preferably used from the viewpoint of cost and dimensional stability. Further, plain weave is preferably used as the weave structure in view of its shape stability. The reason for impregnating and heat-treating this fabric with a mixture of resorcin formalin resin and rubber latex is to prevent the fabric from shifting and deforming, and
This is not only for the purpose of increasing dimensional stability, but also for having the effect of increasing the affinity with the rubber cement applied afterwards and improving the adhesive force between the cement and the fabric.

Here, as the rubber latex in the mixed solution of resorcin formalin resin and rubber latte 7x, vinylpyridine styrene butadiene terpolymer latex,
Although styrene-butadiene copolymer latex, natural rubber latex, chloroprene latex, etc. are used, vinylpyridine-styrene-butadiene terpolymer latex or chloroprene latex is preferably used from the viewpoint of affinity for rubber cement.

Of course, a latex obtained by mixing these latexes may also be used.

Fabrics are impregnated with such a mixed liquid (hereinafter abbreviated as RFL) and subjected to heat treatment, but the amount of the mixed liquid attached to the fabric is preferably kept in the range of 3 to 15% in terms of dry weight. If it is less than 3%, not only the shape stability of the fabric becomes unpalatable, but also the affinity with cement decreases. On the other hand, if it exceeds 15%, the flexibility of the fabric will decrease and the handling properties will deteriorate (
The cost will also be higher.

The heat treatment is performed by drying at 100 to 150°C for 30 seconds to 5 minutes, followed by baking at 150°C to 240''C. If the baking temperature is low, the dimensional stability of the fabric will deteriorate.

A chloroprene rubber cement is applied to the fabric thus treated.

The reason why chloroprene-based rubber cement is used here is that it has high flexibility and flexibility, and because it is a contact type, it has excellent initial adhesion.

It also has the advantage of being inexpensive.

The type of chloroprene rubber is not particularly limited, but one with a medium crystallization rate is preferred.

The reason for this is that when the crystallization rate is high, the initial adhesive strength is high but the adhesion retention time is shortened, and when the crystallization rate is low, the adhesive retention time is long but the initial adhesive strength is inferior, so both are unfavorable.

For this invention, the sulfur-modified type is preferably used because it has excellent adhesion to fibers and has a medium crystallization rate.

The rubber cement is coated on one side of the fabric using a knife coat or the like, and the amount of coating applied greatly affects the adhesion to the tire strip. Adhesion amount is 50g
If it is less than /rd, the adhesive strength will be poor and the strip will easily peel off. On the other hand, if it exceeds 200 g/nf, the coated fabric is generally wound into a roll, but when the fabric is pulled out from the roll, the coated side will stick to the back side of the fabric, making it not only impossible to pull it out, but also unreasonable. If the fabric is pulled out later, a problem arises in that the coat layer is removed to the back side of the fabric.

A flooring material is produced by the following method using the coated fabric produced as described above.

FIG. 1(a) to FIG. 1(e) are explanatory diagrams showing an example of the manufacturing process of the flooring material of the present invention.

In this invention, first, as shown in FIG. 1(a), the tire 1 is cut into a circular shape in the circumferential direction at the shoulder portion 2 of the tire 1 using the rotary blade 3, and the tire side portion 4 is cut off.
(Tire side canting process).

As shown in FIG. 1(b), the cut tire side portion 4 is cut into a spiral shape in the tire circumferential direction by a cutter 5, thereby obtaining a string-like strip material 6.
stripbig process).

Next, as shown in FIG. 1(C), one side of the obtained strip material 6 is puffed using a puffing machine 7 to heat it up to form a puffed strip 8 (puffing process).
.

Next, as shown in FIG. 1(d), a plurality of puffed strips 8 are taken out from the storage box 9 in parallel with each other so that the raised surface (puffed surface) is the front surface, and the puffed strips 8 are taken out from the storage box 9 and placed on the press roller 10.
The adhesive Q is applied to the back side (the opposite side of the exposed surface) by passing through the cement tank 11 while being held down (cementing process), and the adhesive Q is dried in the dryer 12. (drying process), the rubber cement-coated backing fabric 13 according to the present invention is laminated and integrated (lamination process), and this integrated product is rolled up (winding process).

Although the rubber cement Q is attached to the strip material 6 through the cement bath 11, the strip material 6 may be laminated with the backing cloth 13 of the present invention without using cement. In this case, by heating the coated surface of the lining cloth 13 to 40 to 80'C,
Good adhesion is obtained. In this way, a flooring material 20 as shown in FIG. 1(e) is obtained.

This floor material 20 may be cut into predetermined dimensions before use.

Next, the present invention will be described with reference to each embodiment.

〔Example〕

(1) Manufacture of backing fabric [as a conventional example] A plain woven fabric was prepared as a glass fabric in which 120 glass fibers of ECG 1501/3 were inserted per 5 cm in both the vertical and horizontal directions.

On the other hand, as an example of the present invention, a plain woven fabric was used in which 45 fibers of 66 nylon 8400 were inserted per 5 cm in both the vertical and horizontal directions.

[Manufacture of backing fabric of conventional example] (Conventional example 1) Using the above glass fabric, knife-coat one side with rubber cement A shown in Table 1 below to a dry weight of 100 g/I, and then roll it. I took it.

(Left below) Table 1 Rubber cement composition (parts by weight) Note: l) Denka A-90 2) PM-40-NS 3) *-Plex 1120 4) Hitano 3 2192-50 Denki Kagaku Kogyo Co., Ltd. Denki Kagaku Kogyo Co., Ltd. Company Geotsugi Pharmaceutical Co., Ltd. Hitachi Chemical Co., Ltd. Table 2 RFL composition (parts by weight) Since the cement could not adhere to the coating once, it was coated twice to give a coating weight of 100 g/m2.

Each coat was dried at 100°C for 2 minutes to remove the solvent.

(Comparative Example 1) One side of the 66 nylon fabric was coated with rubber cement A shown in Table 1, and as in Conventional Example 1, cement adhesion was 100g/
m.

Other conditions are the same as those in Conventional Example 1.

(Invention 1) 66 nylon fabric was coated with RF having the composition shown in Table 2 below.
After attaching L and making the adhesion amount 7%, 120
After drying at °C for 3 minutes, it was heat-treated at 180 °C for 2 minutes.

Cement was coated using this cloth in the same manner as in Comparative Example 1.

The cement adhesion amount is 100g/m2.

(Margin below) (Invention 2) The same RFL treated cloth as Invention 1 was coated with the cement shown in Table IB at an adhesion of 100 g/n.

(Comparative Examples 2 and 3) Using the same RFL-treated fabric as in Invention 1, the amount of adhesion to the cement shown in Table 1 was 40 g/n (Comparative Example 2) and 250 g/m2. A sample coated with the same method (Comparative Example 3) was prepared.

Here, Comparative Example 2 was created by one coat.

On the other hand, Comparative Example 3 was prepared by coating four times.

(Invention 3.4) Same as Invention 1, only cement adhesion amount was 60g/r.
d was changed to 150 g/m2.

Here, the 60 g/rn' product (invention 3) was created by coating twice.

A 150 g/bo product (invention 4) was produced by coating three times.

A flooring material was manufactured by the method shown in FIG. 1 using the backing fabric prepared as described above.

A rubber strip with a width of 10 mm was used in Section 22.

Incidentally, only Invention 5 was produced without applying cement to the rubber strip, but by heating the surface of the backing fabric to 50°C. Invention 5 used the backing fabric of Invention 1.

All others were manufactured by attaching cement to rubber strips. Cement adhesion was tested so that it was all constant.

A flooring material was produced as described above, but in Comparative Example 3, the coated surface and the back surface of the rolled backing fabric were in close contact with each other, making it impossible to pull it out, so production was discontinued.

The flooring material thus obtained was subjected to the following adhesion test.

■ Initial Adhesion The force required to peel one strip from the backing fabric was measured. The peeling speed was 20 m/+min, and the measurement was repeated 10 times. Results are shown as average values.

(2) Water-resistant adhesive strength The flooring material was immersed in water at 20°C for 7 days, and immediately after taking it out, the peeling force was determined in a wet state using the same method as the initial adhesive strength.

■ Adhesive strength after impact After repeatedly dropping a push rod with a tip radius of curvature of 12.5 mm, thickness of 25 mm, and width of 50 mm+ from a height of 50 mm above the flooring material under a load of 15 kg, the impact of the drop was The adhesion force of the applied part was measured in the same manner as the initial adhesion. Incidentally, the dropping was repeated 10,000 times.

(2) Dimensional stability After the flooring material was left in a gear oven at 120°C for 30 minutes, it was returned to room temperature and dimensional changes before and after heat treatment were measured. Dimensional changes were determined by shrinkage percentage (%) in the length direction of the strip.

■Appearance The appearance of the fibers in the backing fabric was visually checked.

The above test results are summarized in Table 3 below.

(The following is a blank space) As shown in the examples, when the glass fabric of Conventional Example 1 is used, the initial adhesive strength is good, but when immersed in water, the adhesive strength decreases significantly. Also, if an impact is applied, the glass fabric will break and the adhesion will be essentially zero.

On the other hand, when a 66 nylon fabric is used and the fabric is simply coated with cement as shown in Comparative Example 1, the initial adhesive strength is good, and the adhesive strength after impact tends to improve. .

This is presumed to be because the close contact between the rubber strip and the backing fabric was further enhanced by the pressure applied by the impact.

However, the adhesive strength after immersion in water tends to decrease like glass fabric, and since it is not heat treated, it also suffers from large thermal shrinkage, which poses a problem in its dimensional stability as a flooring material. In addition, the weft of the backing fabric has a large misalignment, causing problems in appearance. This occurs when knife-coating rubber cement with high viscosity. To solve this problem, it is necessary to increase the number of threads, which increases costs.

On the other hand, as shown in Invention 2, when 66 nylon fabric is pre-impregnated with RFL and heat-treated, initial adhesion as well as
Water-resistant adhesion and adhesion after impact are also good, and furthermore, both dimensional stability and appearance are good, and a flooring material that is clearly superior in durability compared to conventional flooring materials is provided.

Furthermore, as shown in Invention 2, it can be seen that the adhesive strength is further improved when sulfur-modified roloprene is used as the rubber cement.

On the other hand, as is clear from Comparative Example 2.3 and Invention 3.4, the amount of rubber cement adhered is kept within the range of 50 to 200 g/n (for good adhesion and workability during flooring manufacturing). I understand that something is necessary.

Furthermore, as shown in Invention 5, if the backing cloth of Invention 1 is used, the cloth is heated, and a rubber strip is attached, adhesion can be achieved at a level that does not pose a practical problem even without attaching rubber cement to the rubber strip. It can be seen that the following can be obtained.

〔Effect of the invention〕

This invention involves cutting the tire site part of a waste tire in a spiral shape in the circumferential direction of the tire to form a string-like strip material as described above, arranging a plurality of these strip materials in parallel, and using this as a backing fabric. In the bonded flooring material, the backing fabric is made by heat-treating the organic fiber fabric to impregnate it with resorcin formalin resin and rubber Latinx, and then coating one side with chloroprene rubber cement, which provides durability, dimensional stability, This has the effect of making it possible to obtain a flooring material with excellent appearance.

[Brief explanation of the drawing]

FIGS. 1(a) to 1(e) are explanatory diagrams showing an example of the manufacturing process of the flooring material of the present invention. DESCRIPTION OF SYMBOLS 1... Tire, 2... Shoulder part, 3... Rotating blade, 4... Tire side part, 5... Cutter, 6...
... Strip material, 7... Huffing machine, 8...
・Huffed strip, 9...Storage box, lO...press roller, 11...cement tank, 12...dryer,
13... Lining cloth, 20... Flooring material, Q... Adhesive material. Figure 1 (a) Figure 1 (b)

Claims (1)

[Claims] 1. The tire side part of a waste tire is cut in a spiral shape in the circumferential direction of the tire to form a string-like strip material, a plurality of strip materials are arranged in parallel, and this is used as a backing fabric. A bonded flooring material, characterized in that the backing cloth is formed by heat-treating an organic fiber fabric to impregnate it with resorcin formalin resin and rubber latex, and then coating one side with chloroprene-based rubber cement. 2. The adhesion amount of the above rubber cement is 50g/m^2~2
Claim 1 using a backing fabric within the range of 00g/m^2
Flooring materials listed in . 3. The flooring material according to claim 1, wherein the rubber cement uses a backing fabric coated with cement whose main component is sulfur-modified chloroprene rubber.