JPH0788046B2 - Hose made of soft vinyl chloride resin - Google Patents

Description

TECHNICAL FIELD The present invention relates to a soft vinyl chloride resin hose having improved mutual adhesion resistance, stain resistance and the like.

(Prior art and its problems) With conventional vinyl chloride resin hoses, if they are left for a long time while being wound around a hose reel during transportation or storage, they may stick to each other and become difficult to separate. , If the hose is left with dirt such as muddy water, dirt, and dust after use, the dirt may stick to the hose and may not be easily removed by washing with water. This is phthalate ester type, linear dibasic type, phosphate ester type,
This tendency is remarkable when a large amount of plasticizer for vinyl chloride resin, such as trimetate ester-based, polyester-based, or epoxy-based compound, is used in an amount of 60 parts by weight or more per 100 parts by weight of vinyl chloride resin, and effective measures are desired It was rare.

(Means for Solving the Problems) The present invention has been achieved as a result of earnest research to solve this problem. One or two or more kinds of average degree of polymerization 900 to 4,0
100 parts by weight of vinyl chloride resin 00, 30 parts by weight or more of one or more plasticizers, and silicone oil 0.1 to 15
This is to provide a hose made of soft vinyl chloride resin, which is mainly composed of parts by weight, and this hose has the effect that mutual adhesion does not easily occur even when a large amount of plasticizer is contained, and stains are easily removed. Be done.

Explaining this, the vinyl chloride resin as the main component in the present invention is a type of generally used type having an average degree of polymerization of 900 to 4,000, and these can be used alone or in combination of two or more kinds. . If the degree of polymerization is less than 900, the migration of the plasticizer is high and the physical properties of the obtained molded product are poor, and if the degree of polymerization is more than 4,000, it is used in fields requiring high elasticity, fatigue resistance, etc. However, in general, the cost is high and the moldability is poor, which is not preferable.

The plasticizers used in the present invention are those used for ordinary soft vinyl chloride resins, and include, for example, phthalate esters such as dioctyl phthalate, dibutyl phthalate and diisodecyl phthalate; linear dibasic bases such as dioctyl adipate and dioctyl sebacate. Examples thereof include phosphoric acid ester-based compounds such as triphenyl phosphite; trimellitic acid ester-based compounds; polyester-based compounds; and epoxy-based compounds, and these can be used alone or in combination of two or more. These plasticizers are used in an amount of 30 parts by weight or more, preferably 50 to 100 parts by weight, per 100 parts by weight of the vinyl chloride resin according to the production of the soft vinyl chloride resin hose.

Polymethylphenyl siloxane containing 1 mol% or more of phenyl groups is used for silicone oil, which improves the affinity with vinyl chloride resin and provides soft vinyl chloride resin hose with mutual adhesive resistance and stain resistance. Acts to significantly increase.

A silicone oil having a viscosity of 400 to 5,000 cSt is preferable from the viewpoint of compounding and molding processability. The amount used is 0.1 to 15 parts by weight, preferably 0.1 to 100 parts by weight of the vinyl chloride resin.
2 to 3 parts by weight. If the amount used is less than 0.1 parts by weight, the effect of the above addition cannot be obtained, and if it exceeds 15 parts by weight, the moldability of the composition is significantly deteriorated, and it is difficult to obtain a good product by a usual molding method. Becomes

In the production of the soft vinyl chloride resin hose of the present invention, in addition to the above-mentioned vinyl chloride resin, plasticizer, silicone oil, a vinyl chloride resin stabilizer, a pigment, a filler, as a component that is appropriately added as necessary. Examples include processing aids.

Examples of stabilizers for vinyl chloride resins include cadmium and
Metal soaps such as barium, zinc, calcium, dialkyltin laurate, malate, mercaptide, etc., organic or inorganic compounds of lead, epoxidized soybean oil, phosphite ester, phenol derivative, salicylate ester, benzotriazole derivative, polyhydric alcohol , Nitrogen-containing compounds,
Examples thereof include sulfur compounds, keto compounds, organic silicon compounds, borate esters and the like. These are usually 0.5 of all ingredients
Added in the range of up to 10% by weight.

Examples of the filler include calcium carbonate, talc, clay and the like, and examples of the processing aid include polymethylmethacrylate type and polyester type. In addition to the above-mentioned additives, these additives can be arbitrarily selected and applied as long as they are used in the production of ordinary soft vinyl chloride resin products.

The soft vinyl chloride resin hose according to the present invention can be obtained by mixing a mixture comprising the above components by a conventionally known method and extruding the mixture.

(Examples) Hereinafter, specific embodiments of the present invention will be described with reference to Examples and Comparative Examples, but the present invention is not limited thereto.

Example 1. The following materials were used to prepare four formulations of Examples 1 and 2 and Comparative Examples 1 and 2 shown in the attached table.

Vinyl chloride resin: TK-1300 (Shin-Etsu Chemical Co., Ltd.) Plasticizer: Dioctyl phthalate (DOP) Trioctyl trimellitate (TOTM) Silicone oil: KF-54 (Methylphenyl silicone oil, phenyl group content 25 mol% Stabilizer: AC-190 (barium / zinc stabilizer, manufactured by ADEKA ARGUS) AP-550 (Same as above) Epoxidized soybean oil Each formulation is heated to 120 ° C, mixed and cooled, and then taken out. I got a powder compound. This is extruded by a twin-screw extruder and pelletized by the hot cut method, and the diameter is about 3 m.
A cylindrical pellet compound having a length of m and a length of about 3 mm was prepared. Using these compounds, a single screw extruder with an outer diameter of 20
A soft hose having a diameter of 15 mm and an inner diameter of 15 mm was extruded, and the mutual adhesion resistance and stain resistance of each product were evaluated by the following methods, and the results are shown in a separate table.

Each product was tested in accordance with JIS K6771 for tensile strength, elongation, aging resistance, cold resistance, dipping property, and water pressure, but no significant difference was found between them. The processability of each product was good.

[Mutual adhesion resistance]

The above soft hose was pressed at a surface pressure of 30 kg / m ² at 40 ° C. for 1 hour, and the mutual adhesion resistance between products was evaluated according to the following criteria.

(Judgment criteria) ○: No mutual adhesion.

Δ: Mutual adhesion is slightly present.

X: Mutual adhesion is strong.

[Stain resistance]

Asphalt powder (under 60 mesh sieve) 380g Carbon black 170g Cement 170g White carbon 170g Pentonite 85g Kaolin 85g Turbine oil 87g Put the above compound in a wide-mouthed poly bottle with an internal volume of about 5l and mix well. Next, each of the above soft hoses and those treated with a weatherometer for 100 hours and 500 hours respectively, cut into 100 mm lengths, put these samples in the above polybin and shake well with the compound. , Put the polybin in a gear oven kept at 80 ℃ for 15 minutes, shake it well, and then put it again in a gear oven kept at 80 ℃.
Repeat this shaking operation once every 15 minutes,
After heating in a gear oven at 80 ° C. for 1 hour, the sample was taken out from the gear oven and allowed to cool to room temperature while the measurement sample was kept in the polybin. After cooling, take out the measurement sample from the polybin,
The compound on the sample was brushed off with a soft brush, and the stain condition was observed and judged according to the following criteria.

(Judgment Criteria) O: No stain remains.

Δ: A little stain remains.

X: Very dirty and the color of the sample surface cannot be identified.

(Effects of the Invention) The soft vinyl chloride resin hose according to the present invention is less likely to cause mutual adhesion even when a large amount of a general-purpose inexpensive plasticizer such as DOP is used, and contamination can be easily removed by washing with water.

Claims (2)

[Claims] 1. An average degree of polymerization of one or more than 900-
4,000 vinyl chloride resin 100 parts by weight, one or more kinds of plasticizer 30 parts by weight or more, silicone oil 0.1 to 1
A soft vinyl chloride resin hose whose main component is 5 parts by weight. 2. A soft vinyl chloride resin hose according to claim 1, wherein the silicone oil is polymethylphenylsiloxane containing 1 mol% or more of phenyl groups.