JPH04258641A - Flexible vinyl chloride resin film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soft vinyl chloride resin film. More specifically, the present invention relates to a soft vinyl chloride resin film having transparency, weather resistance, and dust resistance.

0002

2. Description of the Related Art Glass, soft vinyl chloride resin films, polyethylene films, ethylene-vinyl acetate copolymers, etc. are used as transparent coating materials for plant cultivation farms, fish farms, etc. Among these, soft vinyl chloride resin film has a good balance of transparency, heat retention, and physical strength, is relatively inexpensive, and is flexible, so it can be easily used for curved structures. It is often used for agricultural vinyl greenhouses, tunnels, tents, etc.

[0003] However, ordinary soft vinyl chloride resin films suffer from the effects of plasticizers mainly containing di-2-ethylhexyl phthalate and other additives.
The surface of the film becomes sticky, especially at high temperatures such as in the summer. This sticky film has a problem in that soil and dust adhere to it, impairing the transparency and weather resistance of the film, and reducing its function as a transparent coating material. Preventing the adhesion of soil and dust that impairs the transparency of soft vinyl chloride resin films, that is, improving dust resistance, is strongly desired from the viewpoint of maintaining the function as a transparent coating material. In order to improve this dust resistance, ■Reducing the amount of plasticizer added. ■Selection of the main plasticizer type. ■Various methods have been proposed, such as coating the film surface with acrylic resin or the like.

0004

[Problems to be Solved by the Invention] Each of the above methods of improvement has its own problems. That is, (2) a reduction in the amount of plasticizer added results in insufficient flexibility at low temperatures, making it unsuitable for outdoor use. ■ Regarding the selection of the type of main plasticizer, a method using diisononyl phthalate has been proposed. (Special Fair 1-
43778) Although this method is effective in improving stickiness, the tear strength of the film tends to decrease and is not sufficient in terms of dust resistance. Furthermore, improvement by coating the film surface with acrylic resin or the like requires a coating process, resulting in high costs. Therefore, there is a need for a new flexible vinyl chloride resin film that is transparent, weather resistant, and dustproof and can be used as a transparent coating material.

[0005]

[Means for Solving the Problems] As a result of repeated studies on a method for improving dustproof properties without sacrificing the well-balanced performance and economic efficiency of soft vinyl chloride resin films, the present inventors have found that It has been discovered that the desired purpose can be achieved by blending a specific plasticizer and polybutadiene with the resin. The present invention comprises vinyl chloride resin, di-2-propylheptyl phthalate and epoxidized 1,
The present invention provides a soft vinyl chloride resin film that is characterized by containing 2-polybutadiene. More preferably, 40 to 70 parts by weight of di-2-propylheptyl phthalate and 1 to 10 parts by weight of epoxidized 1,2-polybutadiene are blended with 100 parts by weight of vinyl chloride resin. It is a resin film.

In the present invention, vinyl chloride resin refers to vinyl chloride homopolymer resin and vinyl chloride copolymer,
Vinyl chloride copolymer is mainly composed of vinyl chloride and other monomers such as thiene, propylene, vinyl acetate, alkyl vinyl ether, acrylic ester,
Examples include copolymers with methacrylic acid esters, etc., but the present invention is not limited to the above types of resins.

In the present invention, di-2-propylheptyl phthalate is an ester obtained by the reaction of phthalic acid or phthalic anhydride with 2-propylheptanol. 2-Propylheptanol is produced by, for example, producing n-valeraldehyde by oxo synthesis using butene-1 as the olefin, and producing 2-propylheptenal by aldol condensation of n-valeraldehyde and dehydration of the product. However, it can be synthesized by hydrogenation reaction of this 2-propylheptenal. Di-2-propylheptyl phthalate is vinyl chloride resin 100
It is preferable to use it in the range of 40 to 70 parts by weight, and if it is too small, the flexibility in cold weather will be insufficient.
If the amount is too high, the film will become too soft and sticky, making it impossible to obtain a film that satisfies weather resistance and dust resistance.

[0008] It is also possible to use di-2-propylheptyl phthalate as a plasticizer in combination with other plasticizers as long as the effects of the present invention are not impaired. It is preferable to mix 40 to 70 parts by weight with respect to parts by weight. There are no particular restrictions on the use of plasticizers other than di-2-propylheptyl phthalate as long as they are generally used for vinyl chloride resins.
For example, phthalate esters such as di-2-ethylhexyl phthalate and diisononyl phthalate, di-2-adipate
- Adipate esters such as ethylhexyl, phosphate esters such as tricresyl phosphate, trimellitate esters, epoxidized soybean oil, etc. may be used, and two or more of these may be used in combination.

In the present invention, epoxidized 1,2-polybutadiene is obtained by epoxidizing 1,2-polybutadiene by a hydrogen peroxide method, and is an oligomer containing an epoxy group and a vinyl group in the molecule. Epoxidation 1,
The average molecular weight of 2-polybutadiene is preferably 1000, and the blending amount is 1 to 1 part by weight per 100 parts by weight of vinyl chloride resin.
It is preferable to use within the range of 0 parts by weight; if it is too small, the weather resistance and dustproof effects will be insufficient, and if it is too large, the weather resistance and dustproof effects will remain the same, but the elongation of the film will decrease. Therefore, it is undesirable.

The soft vinyl chloride resin film of the present invention contains, in addition to vinyl chloride resin, di-2-propylheptyl phthalate, and epoxidized 1,2-polybutadiene, stabilizers, lubricants, antifogging agents, Ultraviolet absorbers, stabilizing aids, antioxidants, processing aids, coloring agents, etc. can be added. As the stabilizer, for example, Ba-Zn, Ca-Z
Examples include n-based organic composite stabilizers, metal soap stabilizers such as calcium stearate, barium stearate, and zinc stearate, and organotin stabilizers such as dibutyltin dilaurate and dibutyltin mercaptide. . Examples of the lubricant include stearic acid, stearamide, and polyethylene wax. Examples of antifogging agents include polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monopalmitate. As a UV absorber,
Examples include benzophenone types such as 2,4-dihydroxybenzophenone, benzotriazole types such as 2-(5-methyl-2-hydroxyphenyl)benzotriazole, and the like. Examples of stabilizing aids include phosphite esters such as triphenyl phosphite, tri-2-ethylhexyl phosphite, and trinonylphenyl phosphite; examples of antioxidants include t-butyl; Examples include hydroxytoluene and dilaurylthiodipropionate. Examples of processing aids include polymethyl methacrylate. Examples of the coloring agent include phthalocyanine blue and uratramarine blue. In addition, substances commonly used as additives for vinyl chloride resins, such as hindered amine light stabilizers, epoxy resins, and antistatic agents, can be used within the range that does not impair the purpose of the present invention.

The soft vinyl chloride resin film of the present invention is a film formed by blending the vinyl chloride resin with di-2-propylheptyl phthalate and epoxidized 1,2-polybutadiene. For example, commonly used mixing equipment such as a ribbon blender or Henschel type mixer, kneading equipment such as a Banbury mixer or two rolls, film forming equipment such as an extruder equipped with a calendar roll or T-die, etc. can be used. .

0012

Effects of the Invention The soft vinyl chloride resin film of the present invention contains di-2-propylheptyl phthalate and epoxidized 1,
A transparent coating that can be used outdoors and is characterized by containing a specific amount of 2-polybutadiene, which prevents the adhesion and contamination of soil and dust caused by stickiness, and has excellent transparency, weather resistance, and dust resistance. This film is extremely effective as a material. Therefore, the soft vinyl chloride resin film of the present invention is useful as a transparent coating material for plant cultivation sites, fish farms, etc.

[0013]

EXAMPLES The excellent properties of the flexible vinyl chloride resin film of the present invention will be concretely illustrated by examples and comparative examples. The invention is not limited to the examples. Note that di-2-propylheptyl phthalate used in the formulations of Examples and Comparative Examples was obtained by hydrogenating 2-propylheptenal obtained by aldol condensation and dehydration of commercially available valeraldehyde. Heptanol was obtained and synthesized by esterification reaction of heptanol with commercially available phthalic anhydride. In addition, measurements in evaluation tests in the following examples were carried out by the following method.

(1) Transparency The total light transmittance of the obtained film was measured using a haze meter (Nippon Denshoku Industries Co., Ltd.: Model NDH-20D). (2) Weatherproof outdoor, 45 degree slope facing south with film attached, Showa 6
Conducted in Ichihara City, Chiba Prefecture from July 12, 1999 to August 14, 1999. The elongation in the longitudinal direction of the film was measured according to JIS K6732, and the residual elongation rate (%) (elongation after outdoor deterioration ÷ elongation before outdoor deterioration x 100) was calculated. (3) Using the film used in the dustproof and weather resistance test, the haze value was measured using a haze meter (Nippon Denshoku Industries Co., Ltd.: Model NDH-20D).

Example 1 Vinyl chloride resin with an average degree of polymerization of 1300 (Kyodo PVC Sales Co., Ltd.
Co., Ltd.: SM), 45 parts by weight of di-2-propylheptyl phthalate (DPHP), epoxidized 1
, 2 parts by weight of 2-polybutadiene, 5 parts by weight of tricresyl phosphate (TCP), 1 part by weight of epoxy resin (bisphenol A diglycidyl ether), 1.5 parts by weight of barium-zinc organic composite stabilizer, sorbitan monopalmitate 1.5 parts by weight and 0.5 parts by weight of methylene bisstearic acid amide were blended and kneaded for 5 minutes using an 8-inch test roll at 175°C to form a film with a thickness of 0.1 mm. The transparency, weather resistance, and dust resistance of this film were measured. The measurement results are shown in Table 1.

Example 2 Di-2-propylheptyl phthalate (DPH) of Example 1
P) The same test as in Example 1 was conducted except that 45 parts by weight was changed to 65 parts by weight. The measurement results are shown in Table 1. Example 3 Di-2-propylheptyl phthalate (DPH) from Example 1
P) Change 45 parts by weight to 65 parts by weight, epoxidize 1,
The same test as in Example 1 was conducted except that 2 parts by weight of 2-polybutadiene was changed to 4 parts by weight. The measurement results are shown in Table 1. Example 4 Di-2-propylheptyl phthalate (DPH) from Example 1
P) Change 45 parts by weight to 65 parts by weight, epoxidize 1,
The same test as in Example 1 was conducted except that 2 parts by weight of 2-polybutadiene was changed to 7 parts by weight. The measurement results are shown in Table 1.

Comparative Example 1 Di-2-propylheptyl phthalate (DPH) of Example 1
The same test as in Example 1 was conducted except that 45 parts by weight of di-2-ethylhexyl phthalate (Chisso Corporation: DOP) was used instead of 45 parts by weight. The measurement results are shown in Table 1. Comparative Example 2 Di-2-propylheptyl phthalate (DPH) of Example 1
The same test as in Example 1 was conducted except that 45 parts by weight of P) was changed to 45 parts by weight of diisononyl phthalate (Sekisui Chemical Co., Ltd.: DINP). The measurement results are shown in Table 1. Comparative Example 3 The same test as in Example 1 was conducted except for the addition of epoxidized 1,2-polybutadiene in Example 1. The measurement results are shown in Table 1.

[0018]

[Table 1]

Claims (1)

[Claims] 1. A soft vinyl chloride resin film characterized by blending a vinyl chloride resin, di-2-propylheptyl phthalate, and epoxidized 1,2-polybutadiene.