JPS592460B2 - Weather-resistant vinyl chloride resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vinyl chloride resin composition,
The present invention relates to a weather-resistant vinyl chloride resin composition that is particularly effective when used in agricultural covering materials that require weather resistance.

Vinyl chloride resin film is currently the mainstream agricultural covering material because it has excellent heat retention, transparency, strength, and workability, and is relatively inexpensive.

However, when used outdoors, vinyl chloride resin films deteriorate due to various factors such as oxidation and sunlight irradiation.
The film may harden, the elongation of the film may decrease,
It caused discoloration and had problems with its durability. Depending on usage conditions, browning and deterioration may occur in less than one year, and improvement of this problem has been desired. Conventionally, in order to eliminate the above-mentioned drawbacks, stabilizers and
Epoxy compounds, phosphate ester plasticizers, antioxidants,
Attempts have been made to minimize the weather resistance deterioration of vinyl chloride resin films by using chemicals such as ultraviolet absorbers.

However, even if these chemicals are used in combination, the vinyl chloride resin film deteriorates during outdoor use, and a vinyl chloride resin film that can withstand long-term outdoor use has not been obtained.

On the other hand, in recent years, there has been an increasing demand for improved durability of vinyl chloride resin films from the viewpoint of resource conservation, and there has been a desire for the development of new weather-resistant vinyl chloride resin films.

In view of the above circumstances, the present inventors conducted intensive research and found that vinyl chloride resin contains R1 OP-CH2CO0R3 (R1, R2, and R3 are alkyl groups having 1 to 22 carbon atoms, cyclic hydrocarbon groups, allyl groups, and represents these derivatives.

The present invention was completed by discovering that a molded product obtained from a vinyl chloride resin composition containing a compound having the following structure has excellent weather resistance and retains its weather resistance for a long period of time. That is, the vinyl chloride resin composition of the present invention includes a vinyl chloride resin (R1, R2, and R3 each represent an alkyl group having 1 to 22 carbon atoms, a cyclic hydrocarbon group, an allyl group, or a derivative thereof.

) is added to the compound having the structure. Vinyl chloride resins of the present invention include vinyl chloride resins, copolymer resins of vinyl chloride and other monomers such as vinyl acetate, ethylene, propylene, alkyl vinyl ethers, acrylic esters, methacrylic esters, and acrylonitrile. Blends of these resins, blends of these resins with other resins, etc. can be used.

Further, (Rl, R2, and R3 represent an alkyl group having 1 to 22 carbon atoms, a cyclic hydrocarbon group, an allyl group, and derivatives thereof.

) Examples of compounds having the structure include alkyl dialkyl phosphonoacetates such as methyl diethyl phosphonoacetate, ethyl dimethyl phosphonoacetate, ethyl diethyl phosphonoacetate, stearyl diethyl phosphonoacetate, ethyl diphenyl phosphonoacetate, stearyl dicretate, etc. Alkyl diallylphosphosphonoacetates such as dilphosphosphonoacetate and ethyl dixylenylphosphosphonoacetate, allyl dialkylphosphosphonoacetates such as phenyldiethylphosphosphonoacetate, and allyl diallylphosphosphonoacetates such as phenyldiphenylphosphosphonoacetate. Acetate etc. can be used. These compounds may be added alone or in any combination of multiple types. The amount added is preferably 20 parts by weight or less per 100 parts by weight of the vinyl chloride resin. If a large amount is added, these compounds will bleed out onto the surface of the molded product, which is undesirable. From these points of view, a more preferable addition amount range is from 0.01 parts by weight to 10 parts by weight per 100 parts by weight of the vinyl chloride resin. The vinyl chloride resin composition of the present invention may contain additives necessary for processing and other additives for imparting desired performance.

These additives include plasticizers, stabilizer epoxy compounds, drip-proofing agents, lubricants, antioxidants, ultraviolet absorbers, antistatic coloring agents, and fillers. As the plasticizer, all plasticizers commonly used for vinyl chloride resins can be used in the present invention. For example, dihexyl phthalate, dioctyl phthalate, dinonyl phthalate,
Phthalate ester plasticizers such as diisodecyl phthalate and butylbenzyl phthalate; phosphate ester plasticizers such as tricresyl phosphate and tricylenyl phosphate; adipic ester plasticizers such as dioctyl adipate; and dioctyl ester plasticizers. Sebacate-based plasticizers such as sebacate, trimellitic acid ester-based plasticizers such as trioctyl trimellitic acid, polyester-based plasticizers, and the like may be used alone or in combination of any plurality thereof. In particular, a combination of a phthalate ester plasticizer and a phosphate ester plasticizer is preferred from the viewpoint of weather resistance. The amount of these plasticizers added is not particularly limited, and may be determined depending on the flexibility of the molded product to be obtained. As stabilizers, metal salts such as Cd, Ba, Mg, Ca, Zn, Sn, and Pb, which are commonly used in vinyl chloride resins, may be used alone or in combination, or in combination with other stabilizing aids. Applicable. As the epoxy compound, resin type epoxy compounds such as epoxidized soybean oil, epoxidized linseed oil, epoxidized fatty acid monoester, and a polymer of epichlorohydrin and bisphenol A can be used. The vinyl chloride resin composition of the present invention is as follows: (Rl, R2, and R3 represent an alkyl group having 1 to 22 carbon atoms, a cyclic hydrocarbon group, an allyl group, or a derivative thereof.

), the resin composition has excellent weather resistance and extremely long-lasting weather resistance, and also has good thermal stability during molding and good compatibility with resins, making it suitable for agricultural films. It is a thing. Examples are listed below, but the present invention is not limited to these examples.

Examples 1 to 8 100 parts by weight of vinyl chloride resin (degree of polymerization 1300), 48 parts by weight of dioctyl phthalate, 3 parts by weight of tricresyl phosphate, 1.0 parts by weight of resin type epoxy polymer, B
Ethyl diethyl phosphonoacetate [(C2H,O)2-P-CH
2COOC2H5] are respectively 0.01, 0.05, 0
．． 1, 0.5, 2, 5, 10, 20 parts by weight were blended, and these blends were kneaded separately for 10 minutes with two rolls at 160°C, and the thickness was 0.1 m7! A film sample of L was obtained.

The obtained film sample was stretched on the slope of the south side 454 of an enclosed house having a slope of 45 mm on the south side, an outdoor exposure test was conducted, and the state of discoloration and deterioration was evaluated with the naked eye at regular intervals. The evaluation results are shown in the table. Comparative Example 1 A film sample with a thickness of 0.1 mm was obtained under the same conditions as in Examples 1 to 8 except that ethyl diethyl phosphonoacetate was not added.

Claims (1)

[Scope of Claims] 1. A weather-resistant vinyl chloride resin composition obtained by adding a compound having the following structure to a vinyl chloride resin. ▲There are mathematical formulas, chemical formulas, tables, etc.▼(R_1, R_2,
R_3 represents an alkyl group having 1 to 22 carbon atoms, a cyclic hydrocarbon group, an allyl group, or a derivative thereof. )