JP2833710B2 - Antifouling chlorosulfonated polyethylene composition - Google Patents

Description

The present invention relates to a chlorosulfonated polyethylene composition, and more particularly, to a chlorosulfonated polyethylene composition having good roll processability and excellent antifouling properties. Things. The composition of the present invention is suitable for fields requiring excellent weather resistance (antifouling properties), particularly for sheet products for roofing, pond runners and the like.

[Prior art] Chlorosulfonated polyethylene has heat resistance, oil resistance,
It has good ozone resistance and the like, and is therefore applied to hoses, belts, wire coatings, rolls, gaskets, handrails, and the like. Furthermore, chlorosulfonated polyethylene is also used for sheets such as roofing and pond liner, because it provides a beautiful light-colored product having excellent coloring properties. Since these sheets are used outdoors, the sheet surface tends to be stained by rain or dust during use, and it is strongly required that the sheets be kept beautiful for a long period of time. In a conventional chlorosulfonated polyethylene composition,
The antifouling property of maintaining the initial beauty over such a long period is insufficient. As a measure to enhance antifouling properties, attempts have been made to coat the sheet surface with silicone oil, polyurethane, fluororesin, etc., but the workability during sheet construction is inferior, and in terms of performance, the thin film coating layer peels and cracks. A new problem has occurred, and no satisfactory antifouling sheet has been obtained so far.

[Problems to be Solved by the Invention] The inventors of the present invention have conducted intensive studies in order to solve such problems, and as a result, the selection of a processing aid in the blending of chlorosulfonated polyethylene was remarkable. Has been found to affect. The chlorosulfonated polyethylene composition generally contains an acid acceptor, a filler, a plasticizer, a processing aid, an antioxidant, a vulcanization accelerator and the like. Of these, processing aids are required to prevent sticking to the roll surface and to improve the roll workability during kneading work and the calender roll workability during sealing out (Japanese Patent Application Laid-Open No. 61-38942). However, any of the sheets using the conventionally known processing aids have insufficient antifouling properties, and the composition obtained by removing the processing aids to enhance the antifouling properties results in inferior roll processability. There is a problem that the production of the compound becomes difficult. SUMMARY OF THE INVENTION An object of the present invention is to provide a chlorosulfonated polyethylene composition having good roll processability and excellent antifouling property which has solved the above-mentioned problems of the prior art.

[Means for Solving the Problem] This object of the present invention is to provide a chlorosulfonated polyethylene.
Achieved by a composition of chlorosulfonated polyethylene, comprising, per 100 parts by weight, 0.2 to 10 parts by weight of at least one unsaturated fatty acid monoamide selected from oleic amide, erucic acid amide and ricinoleic acid amide. Is done.

[Function] The chlorosulfonated polyethylene used in the present invention may be any commonly used one, for example, Hypalon # 40, Hypalon # 4085, Hypalon # 45, Hypalon # 20 (all trade names of DuPont, USA) There is. These chlorosulfonated polyethylenes have a low chlorine content.
It is 25-45% and the sulfur content is 0.8-1.2%, but in the present invention, it is not necessary to limit to these values and the kind of raw material polyethylene. Also, it may be a blend with other rubber containing 80% or more of chlorosulfonated polyethylene.

The processing aid used in the present invention has 17 to 22 carbon atoms.
Unsaturated fatty acid monoamide having a hydrocarbon of
Representative examples include oleic acid amide, erucic acid amide and ricinoleic acid amide. The compounding amount is per 100 parts by weight of chlorosulfonated polyethylene.
It is 0.2 to 10 parts by weight, preferably 0.5 to 5 parts by weight. When the amount is less than 0.2 parts by weight, the anti-adhesion effect is low, and when the amount is less than 10 parts by weight, the scorch property of the unvulcanized dough increases. As a method of mixing this processing aid, a method of adding it during normal kneading processing is used, but a method of preliminarily including in another compounding agent (acid acceptor or filler) as a preliminary treatment,
Alternatively, it may be contained in the polymer during the production of chlorosulfonated polyethylene.

In addition, an acid acceptor, a filler, a plasticizer, an antioxidant, a coloring pigment, a vulcanization accelerator, and the like are not particularly limited, and are appropriately blended according to the purpose. Magnesium, hydrotalcite, dibasic lead phthalate, epoxy resin and the like can be used. As the filler, calcium carbonate, clay, silica, titanium oxide, magnesium silicate, aluminum hydroxide, barium sulfate and the like can be used. As a plasticizer, one with little discoloring agent is good,
Chlorinated paraffins, naphthenic oils, ester plasticizers and the like can be used. As an antioxidant, 2,6-di-tert-butyl-4-methylphenyl, nickel dibutyldithiocarbamate and the like can be used. As the coloring pigment, phthalocyanine blue, quinacdrine red, benzidine yellow, red stalk and the like can be used. As the vulcanization accelerator, dipentamethylenethiuram tetrasulfide, dibenzothiazyl sulfide, tetramethylthiuram disulfide and the like can be used.

As a method for mixing the above components, a usual rubber kneader, for example, a Banbury mixer, a kneader, an open roll, or the like can be used.

EXAMPLES Hereinafter, the present invention will be specifically described with reference to Examples.
In addition, the numerical values of the composition described here indicate parts by weight, the scorch time of the unvulcanized rubber was tested according to JIS K-6300, and the tensile properties of the vulcanized rubber were tested according to JIS K-6301.

The evaluation of the roll processability was determined by the roll adhesiveness with a 10-inch roll. Water was passed through a 10-inch roll at about 80 ° C., the gap between the rolls was adjusted to 0.3 mm, and the ease of peeling the kneaded dough from the roll was determined.

The antifouling property was evaluated by subjecting the sheet vulcanized by press vulcanization at 100 ° C. for 10 minutes to outdoor exposure at 45 ° southwest for 6 months and determining the degree of contamination on the sheet surface.

Examples 1 to 4 and Comparative Examples 1 to 4 In the examples, an appropriate amount of olefin acid amide, erucic acid amide or riseal acid amide, which are the unsaturated fatty acid monoamides of the present invention, was used. Inappropriate amounts of saturated fatty acid monoamide or sorbitan tristearate or lauric amide (saturated fatty acid monoamide), which is a usual processing aid, were used.
Table 1 shows the blending results and the evaluation results of the roll processability and the antifouling property. As is clear from the table, the composition of the present invention retains all properties in a better balance than the conventional composition. Table 2 shows the scorch time of the kneaded dough obtained by the blending of Table 1 and the tensile properties of the vulcanized product obtained by press vulcanization at 150 ° C. for 30 minutes. It can be seen from the table that the composition of the present invention has practical properties.

[Effects of the Invention] As described in detail above, the chlorosulfonated polyethylene composition of the present invention exhibits good roll processability and excellent antifouling properties which cannot be achieved by the conventional composition. Yes, industrially useful.

Continuing from the front page (72) Inventor Tsuharu Ono 6-1 Okawacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Showa Denko & DuPont Technical Research Institute (72) Inventor Hisashi Sato 3-1-1 Sukekawacho, Hitachi City, Ibaraki Prefecture No. 1 Nippon Electric Cable Co., Ltd.

Claims (1)

(57) [Claims] 1. A chloroform comprising 100 parts by weight of chlorosulfonated polyethylene and 0.2 to 10 parts by weight of at least one unsaturated fatty acid monoamide selected from oleic amide, erucic acid amide and ricinoleic acid amide. A sulfonated polyethylene composition.