JPH04293949A - Antifogging vinyl chloride resin composition - Google Patents

Abstract

PURPOSE:To improve the weatherability of the title compsn. to make it useful as an agricultural covering material, etc., by compounding a vinyl chloride resin with a polyoxyalkylene ether deriv. and a chlorinated benzotriazole ultraviolet absorber. CONSTITUTION:The title compsn. comprises 100 pts.wt. vinyl chloride resin, an antifogging agent consisting of a polyoxyalkylene ether deriv. (e.g. polyoxyethylene nonylphenyl ether) in an amt. of the polyoxyalkylene part of 0.4-2.5 pts.wt., 0.05-0.5 pt.wt. chlorinated benzotriazole ultraviolet absorber [e.g. 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole], and required amts. of a plasticizer, a stabilizer, a lubricant, a colorant, another antifogging agent, another ultraviolet absorber. etc.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an antifogging vinyl chloride resin composition used as an agricultural coating material for greenhouses and the like.

0002

2. Description of the Related Art Agricultural covering materials used in agricultural greenhouses, tunnel cultivation, etc. are made of polyvinyl chloride, polyethylene, ethylene-vinyl acetate copolymers, etc. formed into films. These films are inherently hydrophobic, so when the temperature inside the film is high, water vapor generated inside the film condenses near the film surface and adheres to the film surface as minute water droplets, causing fogging. .

[0003] This cloudiness impairs the transparency of the film and reduces the transmittance of sunlight, which adversely affects the germination of crops and fruits and tends to inhibit their growth. Also,
Since the water droplets fall directly onto the crops and fruits instead of flowing down along the film surface, pathogenic bacteria harmful to the crops and fruits tend to grow.

Therefore, in order to prevent such adverse effects, for example, glycerin fatty acid partial ester, polyglycerin fatty acid partial ester, sorbitan fatty acid partial ester, polyoxyethylene sorbitan fatty acid partial ester,
Polyoxyethylene alkylphenyl ether, N,N
- Attempts have been made to blend nonionic surfactants such as bis(2-hydroxyethyl) fatty acid amide into synthetic resins as antifogging agents and mold them. Additionally, two or more of the above-mentioned nonionic surfactants are used in combination.

[0005]

[Problems to be Solved by the Invention] However, when these antifogging agents are added, the weather resistance of the film decreases, resulting in discoloration to brown or black and a decrease in light transmittance.
The mechanical properties of the film also tend to deteriorate. This tendency is remarkable when a polyoxyalkylene ether derivative is blended with a vinyl chloride resin. An object of the present invention is to provide an antifogging vinyl chloride resin film containing a polyoxyalkylene ether derivative with improved weather resistance.

[0006]

[Means for Solving the Problems] The constitution of the present invention is such that a polyoxyalkylene ether derivative is added to 100 parts by weight of a vinyl chloride resin, and the oxyalkylene group moiety thereof is 0.00 parts by weight.
It is characterized by containing an amount of 4 to 2.5 parts by weight and 0.05 to 0.5 parts by weight of a benzotriazole ultraviolet absorber having a chlorine atom.

The polyoxyalkylene ether derivatives used in the present invention may be known ones, such as polyoxyalkylene sorbitan fatty acid esters, N,N-bispolyoxyalkylene fatty acid amides, polyoxyalkylene fatty acid esters, and polyoxyalkylene alkyl ethers. , polyoxyalkylene alkylphenyl ether, etc. Furthermore, polyoxyalkylene ether derivatives such as those disclosed in JP-A-58-13685 can also be used.

The polyoxyalkylene ether derivative used in the present invention is obtained by addition reaction of either ethylene oxide or propylene oxide, or both, to a compound having active hydrogen. The blending amount of the polyoxyalkylene ether derivative in the present invention is such that the polyoxyalkylene ether portion is 0.4 to 2.5 parts by weight per 100 parts by weight of the vinyl chloride resin. When the amount is less than 0.4 parts by weight, the antifogging properties of the film are hardly improved, and when it exceeds 2.5 parts by weight, the surface of the film becomes sticky, which is not preferable.

The benzotriazole ultraviolet absorber having a chlorine atom used in the present invention includes 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5
-chlorobenzotriazole, 2-(2'-hydroxy-3',5'-di-t-butylphenyl)-5-chlorobenzotriazole, etc. Vinyl chloride resin 100
It is blended in an amount of 0.05 to 0.5 parts by weight. 0
．． When the amount is less than 0.5 parts by weight, there is almost no effect of improving weather resistance, and even when it is added in excess of 0.5 parts by weight, the weather resistance does not improve much.

The vinyl chloride resin used in the present invention is a vinyl chloride homopolymer or copolymer.

The antifogging vinyl chloride resin composition of the present invention optionally contains a plasticizer; stabilizers such as organic tin, metal soap, organic phosphorus compound, and epoxidized soybean oil; fatty acids, N,
A lubricant such as N'-methylenebis fatty acid amide or N,N'-ethylenebis fatty acid amide; a coloring agent; other antifogging agents; and other ultraviolet absorbers may also be blended.

0012

Effects of the Invention The antifogging vinyl chloride resin composition of the present invention has greatly improved weather resistance as compared to conventional compositions, and also has excellent antifogging properties.

[0013]

EXAMPLE A vinyl chloride resin composition blended in the proportions shown below was kneaded for 5 minutes with a roll at 175°C, and then a film with a thickness of 0.1 mm was pulled out from the roll. In addition, in the following examples and comparative examples, parts and percentages are based on weight.

Compounding ratio Vinyl chloride resin (Nippon Zeon Co., Ltd.: Zeon 103EP
100 parts di-2-ethylhexyl phthalate
45 parts tricresyl phosphate

5 parts epoxy resin (Shell Chemical Co., Ltd.: Epicote 828) 1 part N
-N'ethylene bisstearamide
0.5 parts barium stearate

0.3 parts zinc stearate

0.3 parts barium-zinc liquid stabilizer (Kyodo Yakuhin Co., Ltd.: KV-82E-7)
1-part polyoxyalkylene derivative (types listed in Table 1)
2-part benzotriazole UV absorber
Types and amounts listed in Table 1

0
[015] The antifogging properties and weather resistance of the film were tested using the following methods, and the results are shown in Table 1. Twelve types of films measuring 80cm long and 25cm wide are fused together using heat to create a 80cm long and 276mm wide film.
One film of cm was produced. This film has a width of 2
It was placed in a shed measuring 75 cm, 81 cm deep, 40 cm high at the front, and 52 cm high at the back, and its anti-fog properties and weather resistance were observed over a period of 7 months from November to June of the following year. In addition,
The tilt angle of the film was 8 degrees.

The antifogging property was evaluated on a scale of 11, with 10 representing the absence of water droplets and 0 representing the state of water droplets adhering to a film containing no antifogging agent. Weather resistance was evaluated on a 6-point scale, with 5 indicating no change in the film and 0 indicating the entire film turned brown.

From Table 1, the film of the antifogging vinyl chloride resin composition containing the benzotriazole ultraviolet absorber having a chlorine atom of the present invention has excellent antifogging properties and also has improved weather resistance. It is understood that there are In addition, 2-(2'-hydroxy-3',5'-di-
It is understood that films containing t-pentylphenyl)benzotriazole and vinyl chloride resin films containing no ultraviolet absorber have poor weather resistance.

[0018]

[Table 1]

*1) A: Polyoxyethylene (10 mol) nonylphenyl ether (molecular weight 660, oxyalkylene group 66.6
%) B: Polyoxyethylene (3 mol) sorbitan monostearate (molecular weight 562, oxyalkylene group 23.5
%) (molecular weight 5560, oxyalkylene group 9
2.8%) D: Sorbitan monostearate *2) a: 2-(2'-hydroxy-3'-t-butyl-5'-methylphenyl)-5-chlorobenzotriazole b: 2-(2'-hydroxy-3',5'-di-
t-butylphenyl)-5-chlorobenzotriazole c: 2-(2'-hydroxy-3', 5'-di-t-
Pentylphenyl)benzotriazole

Claims (1)

[Claims] Claim 1: Polyoxyalkylene ether derivative in an amount of 0.4 to 2.5 parts by weight of the oxyalkylene group based on 100 parts by weight of vinyl chloride resin, and a benzotriazole ultraviolet absorbing compound having a chlorine atom. agent 0.
An antifogging vinyl chloride resin composition containing 0.05 to 0.5 parts by weight.