JPS5811538A - Agricultural polyvinyl chloride film - Google Patents

Abstract

PURPOSE:To prepare the titled film having balanced and improved weatherability, bleed resistance, bloom resistance, whitening resistance in water, sealability with high-frequency sewing machines, etc., by compounding a vinyl chloride resin with a specific organic phosphonic acid ester, a silicone oil, etc. CONSTITUTION:100pts.wt. of a vinyl chloride resin is mixed with 30-70pts.wt. of a plasticizer, 1.0-3.0pts.wt. of an antifogging agent (e.g. polyethylene glycol monostearate), 0.01-0.20pts.wt. of a silicone oil, 0.1-1.0pts.wt. of tetraphenylalkylene glycol diphosphite of formula (n is 1 or 2; m is 0-2; R is methyl or H), and 0.2-2.0pts.wt. of one or more diphenylakyl phosphites (alkyl is 1-3C alkyl or isodecyl), and the mixture is kneaded and processd to a film e.g. by calendering.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a polychlorinated difluoride film for agricultural use. With the recent remarkable progress in agricultural technology,
Plastic films and sheets have been used as covering materials for agricultural greenhouses and tunnels to maintain heat inside greenhouses and tunnels, and are used to maintain and cultivate agricultural products under suitable temperature and humidity conditions. There is. * Plastics used for agricultural planting include films made of polyvinyl chloride, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc.

However, polyvinyl chloride film is most commonly used due to its light transmittance, heat retention, weather resistance, toughness, workability, and economic efficiency. However, if the film is used for a long period of time, it tends to deteriorate and become weaker, and it also tends to become sticky due to seepage of liquid substances, which lowers the transparency and has a negative effect on weather resistance. . Furthermore, the film may become white and its transparency may be reduced.

These are interrelated, and improving one performance will reduce the performance of others; a film with good performance in all of them has never been developed.

Therefore, the inventors developed weather resistance, bleed, bloom,
In order to obtain an agricultural polyvinyl chloride film with well-balanced improvements in all of its properties, including its resistance to whitening in water, its thermal stability, and its adhesion to high-frequency sewing machines, the present invention has been completed after extensive research.

Hon f! AO agricultural polyvinyl chloride film contains 80 to 70 parts by weight of plasticizer, to to so parts by weight of antifogging agent, silicone oil Q, per 10 parts by weight of vinyl chloride resin.
01 NOJO1 amount 11. and 0.1 to 1.0 parts by weight of tetraphenylalkylene glycol diphosphite (herein, alkylene glycol is a polymer consisting of 2 to 4 carbon atoms) or di-alkylene glycol), diphenylalkylphosphite (ζ It is characterized in that it consists of 001 to 10 parts by weight of one or more selected from the group consisting of 1 to 8 carbon atoms and an isodecyl group.

The vinyl chloride resin, plasticizer, stabilizer, surfactant, and lubricant used as the basic components of the present invention can be arbitrarily selected from those commonly used for agricultural polyvinyl chloride films.

The vinyl chloride resin used in the present invention is polyvinyl chloride, which is mainly made of vinyl monochloride and copolymerized with other vinyl compounds such as vinyl acetate, vinyl chloride, ethylene, propylene, etc. Polymers can be mentioned.

The 411th feature of the present invention is to use a silicone oil in combination with an organic phosphonic acid ester which is a combination of a specific tetraphenylalkylene glycol diphosphite and a specific diphenylalkyl phosphite. More specifically, tet7z28fulkylene glycol diphosphite has the general formula (wherein, n is l or 29m is an integer of 0 to 2.

R represents an organic phosphonic acid ester (representing a methyl group, an ethyl group, or a mineral hydrogen group).

What are the specific names of the chemical compounds? Phenylethylene glycol diphosphite, tetraphenyl diethylene glycol diphosphite, tetraphenyl 1,4-butanediol diphosphite, tetraphenyl 1.11
-Butanediol diphosphite, etc. can be added. The consumption curve, vinyl chloride resin did not improve,
An increase of 1.0 parts by weight increases bleed resistance, plume resistance,
Underwater whitening resistance and high frequency adhesion deteriorate.

Diphenylalkyl phosphites are diphenyl alkyl phosphites containing alkyl and indecyl groups having 1 to 11 carbon atoms. Specifically, diphenylmethyl phosphite, diphenylethyl phosphite,
Diphenylpropyl phosphite and diphenylisodecyl phosphite. In the present invention, one or more of these may be selected and used in an amount of 0.2 to 2.0 parts by weight.

If the amount is less than 0.002 parts by weight, the weather resistance and thermal stability will not improve, and if it is more than 2.0 parts by weight, the bleed resistance and plume resistance will deteriorate. A preferred diphenyl alkyl phosphite is selected from 1 to 8 carbon atoms II tD 7 # -? #
diphenyl alkyl phosphite having a group) 04-1
0 parts by weight, Matasha, carbon number 1-8 mt) 7 Diphenylalkyl phosphite having alkyl group 0.1-
1.0 parts by weight and diphenylisodecylphosphite) 0
．． A combination of B to 1.0 weight S, etc. Both improve weather resistance, bleed resistance, plume resistance, underwater whitening resistance, thermal stability, etc., but the combination of diphenylisodecyl phosphite significantly improves high-frequency sewing machine adhesion.

As a plasticizer, Mori, phthalate esters, fatty acid esters, epoxidized fatty acid esters, phosphate esters,
Examples include polyglycol esters, and these can be used alone or in combination of two or more.

This plasticizer is 8 parts by weight for 100 parts by weight of vinyl chloride resin.
It is used in a proportion of 0 to 70 parts by weight. Even if it is unsuitable as a plasticizer, there is a risk of it breaking, especially at low temperatures, which is undesirable. Moreover, if the content of the plasticizer exceeds 70 parts by weight, it is undesirable because it becomes too soft and causes stickiness, particularly in summer, reducing workability and dustproofing effect.

As the antifogging agent, any antifogging agent that has been conventionally blended into agricultural coating films can be used. For example, polyethylene glycol monostear'-) % yj+' 9 Polyethylene glycol such as ethylene glycol dibehenate;
sorbitan fatty acid esters such as polyoxyethylene sorbitan monostearate and polyoxyethylene sorbitan monooleate, polyoxyethylene ester fatty acid ethers such as polyoxyethylene lacryl ether, glycerin fatty acid ethers such as glycerin behenyl ether, stearic acid These antifogging agents can be used alone or in combination of two or more types, and these antifogging agents are used in amounts of 1 part by weight of vinyl chloride resin.
．． It is used in a range of 0 to 8.0 parts by weight. If the content of the antifogging agent is less than LO parts by weight, the period during which water droplets can be prevented from adhering to the film surface will be short, and if the content of the antifogging agent exceeds 8.0 parts by weight, it will be difficult to blend uniformly and the film will become transparent. sex,
This is not preferable because the bleed resistance and plume resistance decrease.

Examples of the silicone oil include methylphenylbolysiloxane, dimethylpolysiloxane, diphenylpolysiloxane, dimethyl-methylphenylpolysiloxane, dimethyl-diphenylpolysiloxane, and methylhydride tetradiene polysoxane, and one or two of these 5 Use more than one species. The amount added is 0.00 parts by weight per 100 parts by weight of vinyl chloride resin. (11 to 0.20 parts by weight, preferably Fi
o, 08 to 0.16 parts by weight. If the amount added is less than 0.01 parts by weight, there will be no effect, and if it exceeds 0.2 parts by weight, it will not only cause quality deterioration such as decreased transparency and high frequency adhesion of the film, but also cause droplets. In other words, the fall of water droplets can have a negative impact on crops, and the reduced light transmittance can cause insufficient heating power for greenhouses.

Other additives can be used in the agricultural polyvinyl chloride film Ka of the present invention in the same manner as in general film production. As stabilizers, tin, lead, cadmium, barium,
Organometallic compounds containing calcium, zinc, etc. or their inorganic or organic salts are used. As an epoxy compound, bisphenol (Ten or Hiro) is used.
Examples include epoxidized soybean oil-epoxidized linseed oil, and epoxidized higher fatty acid esters for rack shoes. As the lubricant, there may be used a hydrocarbon-based lubricant such as polyethylene wax or microwax, a fatty acid-based lubricant such as stearic acid, a fatty acid-based lubricant such as methylene bisamide, an ester-based lubricant, or an alcohol-based lubricant. In addition, ultraviolet lI collectors, antioxidants, and the like can also be used.

As a means for forming the agricultural polyvinyl chloride film of the present invention, ordinary film forming means can be used.

Examples include calender molding, extrusion molding, and inflation molding.

At this time, there are no particular restrictions on the molding conditions.

Next, the present invention will be explained in more detail with reference to Examples and Comparative Examples. Measurement and evaluation of each physical property in Example 1 was carried out as follows.

Weather resistance: Sunshine Taki weather resistance tester was used.

The film was irradiated for 994 hours, and the film O elongation rate before and after irradiation was measured.

Good □ Elongation rate after irradiation is more than half of the elongation rate before irradiation Poor - Elongation rate after irradiation is less than half of the elongation rate before irradiation Bleed resistance: High-pressure polyethylene film is placed on both sides of the 60 cod x 5 Qm x lff test piece. A load of 1# was applied to the test piece, and the test piece was left in an open state at 70°C for 10 days, and the weight reduction rate (transfer rate) of the test piece before and after heating was determined using the following formula.

Plume resistance: Constant temperature constant temperature bath (Mitamura Riken's Atsushi type % type % 80% with 14 60mx6oswx Lugo test pieces
The haze values before and after the test were recorded in the table. The smaller the difference, the better.

Write down the value in the table. The smaller the difference, the better - 0 Thermal stability:
Place 10 test pieces of 70 m x 50 parts w x 1 mm in a gear aging tester (manufactured by Toyo Seiki, LA!l), iys"c.
Leave it in for 00 minutes, visually check the degree of discoloration, and evaluate the degree of color change.

Best - no discoloration at all.

Good□A little coloring.

Poor - Significant discoloration.

Adhesiveness: High-rise *# Thin (-Japan High Frequency G Type KL!-60
Using (1), room temperature I! 6℃, Clear J1! -・% under cloudy conditions, voltage @OV, tuning ss, feed speed 1 (1111
Tensile peel the two welded parts of the 0.111110 film at a speed of 8 times for each gos at a speed of 0.111110 cm, and then observe the condition and make the following evaluation.

Arashi □The welded parts cannot be peeled off and other parts cannot be peeled off. Parts are damaged.

Defective - Peeling from the welded area without resistance is observed.

Fog observation results: Pour into a 2tI10 ribbon blender in a designated mud tank and heat and mix at 60°C for 40 minutes. About 20# of the mixture was placed in a 60I Banbury mixer at 140°C.
and knead for about 2 minutes. Thereafter, it was formed into a film with a thickness of 0.1 mm using a 28-inch inverted LII V roller at 180°C. After molding! 1. Autumn exposure to Ogai at Shurei House (
(October), and the fog generation status was evaluated by observing the inner paper as follows.

0jlL Good: There is almost no fog in the morning or evening.

ΔNormal... Morning and evening fog occurrence is on par with general agricultural biofilm 1 →
.

×Poor: Fog occurs extremely often in the morning and evening.

Examples 1-6. Comparative Examples 1 to 16 100 parts by weight of polyvinyl chloride (average degree of polymerization 186G),
47 parts by weight of dioctyl heptalate, tricrezi phosphate:
6 parts by weight, barium Q benzoate, IS part, zinc stearate a, 7 parts, diglycidyl ether of bisphenol A (EP-18 manufactured by Adeka Argus) 8 parts by weight, sorbitan monopecnate (PA1??9 Kuzen oil) Chemical a') L1 part by weight, polyoxyethylene sorbitan monostearate (Tenon 1O51, Maruzen Yuka 1l) Q, 7 parts, stearic acid O1! Mix well the ingredients shown in the parts and tables, and add 6
Using an inch calender, the film performance was measured at 160°C using a predetermined method on agricultural polyvinyl chloride film with a thickness of Showing mourning?

Claims (2)

[Claims] (1) For 100 parts by weight of vinyl chloride resin, 30 to 70 parts by weight of a quenching agent, parts by weight of an antifogging agent i, o-s,
Silicone piece 0.01-0. O parts by weight, general formula (in the formula, aa14L< is 29m is an integer from O to 2, B is 4
Tetraphenylalkylene glycol diphosphite 0.1-LO represented by (thyl group or hydrogen group)
Parts by weight, phenyl alkyl phosphite 11 [
(Here, alkyl is 91 to 91 carbon atoms and isodecl group) OO, t -
An agricultural polyvinyl chloride film characterized by containing 0 parts by weight of &. (2) Diphenylalkyl phosphite has 1 to 3 carbon atoms
Diphenyla k11 with alkyl? Claim II (1) containing 2 to 10 parts by weight of rufos 7-ite
Agricultural polyvinyl chloride # film described in Section 1. <8) Schiff° enyl alkyl phosphite has 1k carbon
0.1 to 1.0 part by weight of diphenyl alkyl phosphite having 1 to 1 alkyl, and 0.1 to 1 part by weight of diphenylisodecyl phosphite, according to claim (1). PVC film for use.