JPS6247456B2 - - Google Patents

Description

[Detailed description of the invention]

(Industrial Application Field) The present invention relates to a vinyl chloride resin composition that provides excellent matte molded products. (Prior Art) Conventionally, in order to obtain a matte soft vinyl chloride resin molded product, a method of lowering the molding temperature has been adopted. However, with this method, the resin is not sufficiently melted and kneaded in a molding machine such as an extruder, resulting in the resulting molded product having poor mechanical properties.In addition, the low die temperature causes the resin and mold to interact. The disadvantage is that the frictional resistance is large and uneven surface roughness of the molded product becomes noticeable. (Structure of the Invention) As a result of intensive research by the present inventors in order to obtain a vinyl chloride resin molded product having an excellent matte appearance without the disadvantages of the conventional art,
This invention has been achieved by (a) 100 parts by weight of vinyl chloride resin, (b) 0.4 to 2.0 parts by weight of polyethylene with an average molecular weight of 500 to 6,000, and (c) an average molecular weight of 500 to 6,000.
The present invention relates to a vinyl chloride resin composition for matting, which comprises 0.4 to 3.0 parts by weight of polyethylene oxide 3000, (iv) 0.1 to 0.4 parts by weight of a crosslinking agent, and a required amount of a plasticizer. The resin composition of the present invention has moldability equivalent to that of ordinary vinyl chloride resin compounds, and can be molded at a molding temperature at which the inherent mechanical properties of vinyl chloride resin are fully expressed. A molded article with a remarkable matte surface effect is obtained, which also has the advantage of being a molded article with excellent mechanical strength. To explain this, in order for the vinyl chloride resin composition of the present invention to exhibit its excellent matting effect, adding component (2) together with components (b) and (c) will greatly promote the matting effect. The lack of either of these makes it impossible to obtain a high degree of matte effect. The polyethylene as component (b) and the polyethylene oxide as component (c) are each required to have a molecular weight within the above-mentioned range. If the molecular weight is too small, the matting effect is difficult to appear, and if the amount added is increased to compensate for this, the mechanical properties of the molded product will be greatly deteriorated.On the other hand, if the molecular weight is too large, the vinyl chloride resin This is because, in this case as well, the mechanical properties of the molded article deteriorate as the compatibility with the molded article deteriorates, and the surface of the molded article becomes rough. As the above-mentioned (b) polyethylene, commercially available polyethylene wax (terminal hydroxyl group, molecular weight 500~
6000), but of course molecular weight 500~ obtained by polymerizing ethylene at a low degree of polymerization.
Any polyethylene in the 6000 range can be used. But preferably 800-2500
More preferably, those having a molecular weight in the range of 1000 to 2500 are preferred. The oxidized polyethylene as the component (c) is an oxidized product of low molecular weight polyethylene, which is conventionally known as a floor polishing wax or fiber treatment agent, and has a molecular weight in the range of 500 to 3000. If available, either fully oxidized or incompletely oxidized polyethylene may be used. However, those having a molecular weight preferably in the range of 800 to 2,500, more preferably 1,000 to 2,500 are preferred. Commercially available polyethylene oxide products include polyethylene oxide 629A and 6A manufactured by Allied Chemical Co., Ltd.
etc., and can be used in the present invention. The mixing ratio of component (b) and component (c) to (a) vinyl chloride resin is 0.4 to 2.0 parts by weight (preferably 0.5 to 1.5 parts by weight of component (b) per 100 parts by weight of vinyl chloride resin).
parts by weight), component (c) is 0.4 to 3.0 parts by weight (preferably
(0.5 to 2.0 parts by weight). If either component (B) or component (C) is too small, the matting effect will be poor and the objective will not be achieved.On the other hand, if either component (B) or component (C) is too large, slippage will be large. As a result, sufficient melting and gelation is not achieved during kneading of the resin in a molding machine such as an extruder, resulting in molded products having poor appearance and poor mechanical properties. In addition, the crosslinking agent added as component (d) is 6-R-1, 3, 5-triazine-2,
4-diol, 6-dibutylamino-1, 3, 5
-triazine-2,4-dithiol, 2-R-
Examples include 4,6-dimethylcapto-S-triazine. The amount of the crosslinking agent added needs to be 0.1 to 0.4 parts by weight per 100 parts by weight of the vinyl chloride resin; if this is too small, a matting effect cannot be obtained, while if it is too large, the mechanical properties of the molded product Please be careful as this may lead to inferior performance. When using the above crosslinking agent, it is desirable to use a metal activator such as magnesium oxide (MgO) or barium oxide (BaO) in combination, and the amount added is approximately 2 to 100 parts by weight of vinyl chloride resin. It is said to be 7 parts by weight. In this way, component (b) for vinyl chloride resin,
By adding and blending component (c) and component (d),
It is possible to obtain a molded product with a remarkable matte effect, but this effect is fully exhibited even when the molding temperature is set to a sufficiently high temperature, for example, 180°C, so the molded product obtained is In addition to having excellent mechanical properties, it also has the advantage of improved surface smoothness. The vinyl chloride resins targeted by the present invention include vinyl chloride homopolymers and copolymers mainly composed of vinyl chloride, and examples of comonomers copolymerized with vinyl chloride include vinyl esters such as vinyl acetate, and acrylic acid. or esters thereof, styrene, maleic anhydride, acrylonitrile, olefins such as ethylene and propylene, and vinylidene chloride. On the other hand, plasticizers include dioctyl phthalate (DOP), dibutyl phthalate (DBP), and tricresyl phosphate (TCP), as well as epoxy plasticizers, polyester plasticizers, adipic acid plasticizers, and trimeritz. Examples include acid plasticizers. These plasticizers are added in appropriate amounts depending on the type of the intended molded product (soft molded product), and may be the same as conventional ones. This composition may further include stabilizers such as basic lead sulfate, calcium stearate, barium stearate, other complex salts, titanium white,
Conventionally, fillers such as calcined clay and calcium carbonate, pigments such as carbon black, modified resins such as acrylonitrile-butadiene-styrene resin, urethane resin, ethylene-vinyl acetate resin, and chlorinated polyethylene may also be blended. It is similar to The resin composition of the present invention can be obtained by uniformly mixing the above-mentioned essential components and each component added as necessary by a conventionally known method using a Henschel mixer, a ribbon blender, or the like. In order to obtain a molded article from this, various conventionally known molding methods can be employed. For example, the compounded composition is kneaded using a mixer such as an extruder, roll kneader, or Banbury mixer; After pelletizing, it can be molded according to the desired product, and the molded product thus obtained has an excellent matte surface effect and good mechanical properties, so it can be used for general sheets, synthetic leather, synthetic resin tiles, and electric wire sheaths. and other various products. Next, specific examples of the present invention will be given. Example 1 (Experiment Nos. 1 to 4) Vinyl chloride resin TK-1300 [trade name manufactured by Shin-Etsu Chemical Co., Ltd.], dioctyl phthalate (DOP), calcium carbonate, tribasic lead sulfate, polyethylene, polyethylene oxide 6 -R-1,3,5-triazine-
2,4-dithiol (crosslinking agent) and magnesium oxide were blended in the proportions shown in Table 1, and this was
It was extruded into pellets at ℃. This pellet was extruded using an extrusion molding machine equipped with a T-die having a thickness of 1 mm at a processing temperature (resin temperature at the exit of the die) of 180°C to obtain a sheet having a thickness of about 1 mm. The matte state and surface smoothness of this product were determined as shown in Table 1.

【table】

[Table] Example 2 (Experiment Nos. 5 to 8) Vinyl chloride resin TK-1300, tribasic lead sulfate,
Epoxidized soybean oil, a barium-zinc stabilizer (stabilizer), polyethylene, polyethylene oxide, the same crosslinking agent as in Example 1, magnesium oxide, and a plasticizer were mixed in the proportions shown in Table 2, and the mixture was heated to 130°C.
It was extruded into pellets. However, the same polyethylene and polyethylene oxide as in the previous example were used. This pellet was extrusion molded in the same manner as in Example 1 to obtain a sheet approximately 1 mm thick. The matte state and surface smoothness of this product were determined in the same manner as in the previous example, and the results shown in Table 2 were obtained.

[Table] Comparative Examples (Experiments Nos. 9 to 11) The matte state and surface smoothness were determined in the same manner as in Experiments Nos. 1 to 3, except that the amount of crosslinking agent was changed to 0, 0.05, and 0.5 parts by weight, respectively. As a result, the results shown in Table 3 were obtained.

【table】

Claims (1)

[Claims] 1 (a) 100 parts by weight of vinyl chloride resin, (b) 0.4 to 2.0 parts by weight of polyethylene with an average molecular weight of 500 to 6000, (c)
Polyethylene oxide 0.4~ with average molecular weight 500~3000
A vinyl chloride resin composition for matting, comprising 3.0 parts by weight, (d) 0.1 to 0.4 parts by weight of a crosslinking agent, and a required amount of a plasticizer.