JPH0881605A - Rigid vinyl chloride-based resin composition for calendering - Google Patents

Abstract

PURPOSE: To obtain a rigid vinyl chloride-based resin composition for calendering, capable of effectively preventing occurrence of plate-out in calendering and providing a sheet and a film having good surface. CONSTITUTION: This vinyl chloride-based resin for calendering is obtained by blending 100 pts.wt. of a vinyl chloride-based resin with 0.1-1 pt.wt. of calcium carbonate fine powder having 0.1-0.5μm average particle diameter.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention prevents the occurrence of plate-out on the surface of a calender roll during the production of a hard vinyl chloride resin sheet and film by calendering, and provides a sheet and film having a good surface. It relates to the composition obtained.

[0002]

2. Description of the Related Art A calendering method is generally used as a method for producing a hard vinyl chloride resin sheet and film. However, calendering a vinyl chloride resin composition tends to cause plate-out. Plate-out is a phenomenon in which the content in the vinyl chloride resin composition adheres to the surface of the calender roll to cause fogging on the surface of the roll, and when plate out occurs, the vinyl chloride resin sheet and film. The surface property of is deteriorated.

As a measure against plate-out, the plate-out substance adhering to the roll surface is analyzed, the substance causing plate-out in the composition is investigated, and the added amount of the substance is reduced or replaced with another substance. Although the method is often used, if the addition amount is reduced, problems in performance and productivity are likely to occur, and substitution with other substances tends to increase the compounding cost. It was not possible to say that it was a practical method because it could not obtain the desired effect.

[0004]

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned drawbacks of the prior art and, even if a hard vinyl chloride resin composition contains a substance that easily plate out, plate out in calendering. It is an object of the present invention to provide a hard vinyl chloride resin composition for calendering, which effectively prevents the occurrence of the above and obtains a sheet and a film having a good surface.

[0005]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned problems, the present inventors have found that by adding a specific amount of a specific calcium carbonate fine powder to a vinyl chloride resin, a plate-out can be performed. It was found that the occurrence of the above can be effectively prevented, and the present invention has been completed based on this finding.

The present invention has the following configuration. An average particle size of 0.1 to 0.
A hard vinyl chloride resin composition for calendering, containing 0.1 to 1 part by weight of 5 μm calcium carbonate fine powder.

The vinyl chloride resin used in the present invention is mainly composed of polyvinyl chloride and vinyl chloride, and other monomers such as vinyl acetate, ethylene, propylene, alkyl vinyl ether, acrylic ester and methacrylic ester. Examples thereof include copolymers obtained by copolymerization reaction of maleic acid ester, acrylonitrile and the like, polyvinyl chloride or the above copolymers and chlorine-containing polymers such as chlorinated polyethylene or polymer blends of polyvinyl chloride and the copolymer. The degree of polymerization of the vinyl chloride resin is preferably selected from the range of 450 to 1000.

As the calcium carbonate fine powder used in the present invention, precipitated calcium carbonate having an average particle diameter of 0.1 to 0.5 μm, ground calcium carbonate, and surface-treated activated calcium carbonate can be used. . Particle size is 0.
If it exceeds 5 μm, the smoothness of the surface of the obtained hard vinyl chloride resin sheet and film is impaired. On the other hand, if the particle size is less than 0.1 μm, the plate-out prevention effect becomes poor.

The amount of calcium carbonate fine powder added is
Although it is appropriately adjusted depending on the degree of plate-out, it should be used in the range of 0.1 to 1 part by weight with respect to 100 parts by weight of the vinyl chloride resin. If the blending amount is less than 0.1 part by weight, the plate-out prevention effect is insufficient,
On the other hand, if it exceeds 1 part by weight, the color tone and surface property of the sheet or film are adversely affected. Generally, calcium carbonate fine powder is used as a filler for vinyl chloride moldings.
It is used in a high composition of more than 1 part by weight, and has not been used until now in the range of 0.1 to 1 part by weight in order to prevent plate-out as in the present invention.

The vinyl chloride resin used in the present invention may be appropriately added with a heat stabilizer, a lubricant, an impact resistance enhancer, an antioxidant, an ultraviolet absorber, a colorant and an antistatic agent. it can. The plasticizer can be added and used in the range of 10 parts by weight or less with respect to 100 parts by weight of the vinyl chloride resin.

Examples of heat stabilizers include zinc stearate, calcium stearate, barium stearate,
Examples thereof include dioctyl tin maleate, dioctyl tin mercaptide, organic phosphate metal salts, and organic phosphite ester. Examples of lubricants include paraffin, fatty acids,
Examples include fatty acid esters, fatty acid amides, fatty acid metal soaps, higher alcohols such as stearyl alcohol, polyethylene wax, polypropylene wax and the like. Examples of the impact resistance enhancer include MBS resin and ABS.
Resin, chlorinated polyethylene resin, acrylic resin and the like can be mentioned. Examples of the plasticizer include di-n-octyl phthalate, di-2-ethylhexyl phthalate,
Phthalates such as dibenzyl phthalate and diisodecyl phthalate, di-n-octyl adipate, di-
Examples include adipic acid esters such as 2-ethylhexyl adipate and epoxidized soybean oil.

The composition of the present invention is generally mixed by using a high speed mixer or a ribbon blender and then kneaded by a continuous kneader or a mixing roll, and then by a calendar roll such as an inverted L type. It is rolled and processed into sheets and films.

[0013]

The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereto.

Evaluation Test The compositions obtained in Examples 1 to 3 and Comparative Examples 1 to 3 were put into an M-type calender molding machine manufactured by Ishikawajima Harima Heavy Industries Co., Ltd., which was set at a temperature of 190 ° C., and had a thickness of 0.3 mm and a width of 1000.
The molding machine is set to obtain a sheet of mm and continuous 1
After performing the calendar processing for time, the plate-out state of the surface of the calendar roll and the surface of the obtained sheet were visually observed and evaluated according to the following criteria. (Plate out condition) ○: The calendar roll was not fogged. Δ: The calendar roll was slightly cloudy. X: The calendar roll was cloudy. (Sheet surface property) Smoothness: The surface of the obtained sheet was smooth. Rough skin: The surface of the obtained sheet was rough.

Example 1 2.5 parts by weight of an organotin stabilizer (Adeka Stab 465E manufactured by ADEKA ARGUS CORPORATION) and a lubricant (LX-3 manufactured by Kyodo Chemical Co., Ltd.) with respect to 100 parts by weight of polyvinyl chloride (Kyodo Vinyl SE).
A-6) 0.5 parts by weight, lubricant (RW-made by Noda Wax Co., Ltd.)
01) 0.5 parts by weight, 10 parts by weight of impact resistance enhancer (Metabrene C-223 manufactured by Mitsubishi Rayon Co., Ltd.), average particle size 0.4
0.1 part by weight of 0 μm heavy calcium carbonate (Whiten P-10 manufactured by Toyo Fine Chemical Co., Ltd.) was mixed and stirred for 5 minutes with a Henschel mixer to obtain a hard vinyl chloride resin composition. The above-mentioned evaluation test is carried out using the composition,
The plate-out property and the surface property of the sheet were examined. The results are shown in Table 1.

Example 2 In accordance with Example 1 except that the addition amount of the heavy calcium carbonate of Example 1 was changed from 0.1 part by weight to 1.0 part by weight,
A hard vinyl chloride resin composition is obtained, and using the composition,
The above evaluation test was carried out to examine the plate-out property and the surface property of the sheet. The results are shown in Table 1.

Example 3 Except that the heavy calcium carbonate having an average particle size of 0.40 μm in Example 2 was replaced by surface-treated activated calcium carbonate having an average particle size of 0.12 μm (Shiragika CCR manufactured by Shiraishi Industry Co., Ltd.).
In accordance with Example 2, a hard vinyl chloride resin composition was obtained,
Using the composition, the above evaluation test was carried out to examine the plate-out property and the surface property of the sheet. The results are shown in Table 1.
Shown in

Comparative Example 1 A hard vinyl chloride resin composition was obtained by carrying out the above evaluation test in accordance with Example 1 except that the heavy calcium carbonate of Example 1 was not added. It was used to examine the plate-out property and the surface property of the sheet. The results are shown in Table 1.

Comparative Example 2 According to Example 1, except that the addition amount of the heavy calcium carbonate of Example 1 was changed from 0.1 parts by weight to 1.5 parts by weight,
A hard vinyl chloride resin composition is obtained, and using the composition,
The above evaluation test was carried out to examine the plate-out property and the surface property of the sheet. The results are shown in Table 1.

Comparative Example 3 Except that the heavy calcium carbonate having an average particle size of 0.40 μm in Example 2 was replaced with a heavy calcium carbonate having an average particle size of 0.68 μm (Whiteon P-30 manufactured by Toyo Fine Chemical Co., Ltd.). Based on Example 2, a hard vinyl chloride resin composition was obtained, and the above evaluation test was carried out using the composition to examine the plate-out property and the surface property of the sheet. The results are shown in Table 1.

[0021]

From Examples 1 to 3 and Comparative Examples 1 to 3,
By using a hard vinyl chloride resin composition in which a specific amount of calcium carbonate fine powder having a specific particle diameter is added to a vinyl chloride resin, calendering can be effectively prevented and the plate-out can be obtained. It is obvious that the surface properties of the molded product can be improved.

[0022]

[Table 1]

Claims (1)

[Claims] 1. Hardness for calendering, characterized in that 0.1 to 1 part by weight of calcium carbonate fine powder having an average particle diameter of 0.1 to 0.5 μm is mixed with 100 parts by weight of vinyl chloride resin. Vinyl chloride resin composition.