JPS5853154B2 - PVC composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing vinyl chloride resin (hereinafter abbreviated as PVC) tiles.

Conventionally, in the production of PVC tiles, a composition containing PVC and asbestos as the main components, mixed with various additives, fillers, etc., has been used.

However, this composition has the disadvantage that impurities in the asbestos cause discoloration due to decomposition of the vinyl chloride, and discoloration occurs due to thermal decomposition of the vinyl chloride during thermal processing such as a rolling process.

Another drawback is that when a sheet-like material such as a tile is formed using a roll, chilene is generated, which impairs the yield of the tile.

Furthermore, it also had the disadvantage that the amount of dent in the tile specified by JISA5705 was small.

In the manufacture of other tiles, compositions were used in which PVC and polyester fibers were the main components, and fillers and the like were added thereto as in the case described above.

However, this composition has a large amount of change in heating length in the machine direction as defined by JISA5705.

This is thought to be the cause of the defect that cracks form perpendicularly to the length direction of the sheet when it is shaped by a roll or the like (specifically, a tile).

Furthermore, as mentioned above, it had the disadvantage that the amount of denting was small.

The present invention has been made in view of the above-mentioned circumstances, and its purpose is to eliminate all of the above-mentioned drawbacks and provide a PVC composition of excellent quality.

The present invention will be explained in detail below.

The manufacturing method of the PVC tile according to the present invention is 0.5 to 3.0% by weight.
It is characterized by blending asbestos, 0.05 to 1.5% by weight of polyester fiber, and vinyl chloride, and then kneading and forming into a sheet.

and, if necessary, fillers, other binders, plasticizers, colorants, etc.
Stabilizers and the like may be added during kneading.

Note that prior to kneading, each raw material may be mixed (tri-blend) using a blender or the like.

For kneading, use a panbari mixer, mixing roll, etc.

After kneading, the mixture is made into sheets using calender rolls, and if necessary, cut into appropriate dimensions to make tiles of a fixed length.

However, there is no difference in these processes as they are conventional methods.

In addition, the type and amount of asbestos used in the present invention are not particularly limited, but the amount is preferably 0.
．． It is 5 to 3.0% by weight.

Further, the type, length, thickness, blending amount, etc. of the polyester fibers are not particularly limited, but preferably the length is 0.1 to
50wIrL1 thickness 1-20 denier, blending amount 0.05
~15% by weight.

If the length and thickness are below the above range, there will be no practical effect.
If the mixture is turned over, the kneaded raw fibers will become lumpy and will not be uniformly dispersed in the composition.

Regarding the blending amount, if it is less than 0.05% by weight, there is no effect, and if it exceeds 1.5% by weight, there is no effect.

In particular, when asbestos is used in combination, a synergistic effect is exerted, and there is a remarkable difference in heating length change and oxidation.

Next, a case will be described in which the present invention is applied to vinyl asbestos tiles.

That is, the vinyl chloride composition of the present invention is processed according to the tile manufacturing process actually used.

At that time, asbestos and polyester fibers are well intertwined with each other in the cross-wire process of the Banbury mixer and the mixing process of the mixing roll, which is thought to produce the effects of the present invention, which will be described later.

As described above, in the method for manufacturing PVC tiles according to the present invention, vinyl chloride resin, asbestos, and polyester fibers are blended, so it is impossible to expect much from blending only asbestos or polyester fibers. It is possible to achieve an unprecedented effect, that is, a so-called synergistic effect due to the combination of both asbestos and polyester fibers.

Therefore, specifically, the vinyl chloride composition according to the present invention can obtain the following effects.

■) The amount of denting at 20°C (JIS A3705) is large.

2) (flow direction) heating length, amount of change (J l5A570
5) is small.

3) Less chilene is produced during production.

The advantage of reducing the amount of fluorine is that the rejection rate of products, such as tiles, which are formed into sheets using rolls, is significantly reduced.

In addition, by adding polyester fiber, the amount of asbestos used is reduced (previously it was 3.0 to 5.0% by weight, but this was reduced to 0.5 to 3.0% by weight).
Therefore, discoloration of PVC can be suppressed.

Next, Examples and Comparative Examples will be described.

That is, a vinyl chloride composition was obtained according to the conventional method according to the formulation shown in the attached table, and tiles were manufactured according to the conventional method.

Then, the amount of indentation and the amount of change in heating length at 20° C. were measured according to the test method specified in JIS A3705, and are shown in the same table.

Furthermore, the vinyl chloride composition was inspected for oxidation during molding by visual inspection, and the results are shown in the same table.

In the table, △: Notable cracks, ○: Slight cracks, ◎: Very few cracks.

Further, after a small piece of the sample was left in a gear oven at 180° C. for 40 minutes, the chromaticity due to heat was measured using a color difference meter.

From this result, the CIE color difference (ΔE in the table) was determined and the results are shown in the table.

Note that A1 to &4 and A10-16.14 are comparative examples.

Claims (1)

[Claims] 1. In the manufacturing method of PVC tiles, vinyl chloride resin and asbestos are mixed with polyester fibers having a length of 0.1 to 50 m and a thickness of 1 to 20 denier, with asbestos of 0.5 to 3.0% by weight and polyester fibers of 0.1 to 1.0% by weight. A method for producing a vinyl chloride tile, comprising the steps of blending so that the content is 5% by weight, then kneading and forming into a sheet.