JPH0476043A - Vinyl chloride resin film for agricultural use - Google Patents

Abstract

PURPOSE:To prepare the title film excellent in antiblocking properties, transparency, strengths, etc., by compounding a vinyl chloride resin with solid particles having specified particle size and shape. CONSTITUTION:100 pts.wt. vinyl chloride resin is compounded with 0.6-2.5 pts.wt. solid particles having a particle size of 7-10mum and a specified shape, e.g. polyhedral or spherical particles of aluminosilicate or silica, and, if necessary, a plasticizer (e.g. dibutyl phthalate), an antifog agent, a lubricant, a thermal stabilizer, etc. The resulting compsn. is formed into the title film, which, when used for a greenhouse or plastic tunnel, is free from blocking during ventilation operation or opening or closing of the house or tunnel.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vinyl chloride resin film for agricultural use, and more specifically, to prevent blocking during opening and closing operations of a film covering a greenhouse or tunnel in greenhouse horticulture. This is a polyvinyl chloride-based tree cover film for agricultural use.

[Conventional technology]

In recent years, forced cultivation or suppressed cultivation in greenhouses or tunnels has become widely practiced in order to cultivate useful plants efficiently and in line with marketability. Vinyl chloride resin film, which has excellent weather resistance, transparency, and heat retention, is used as a material to cover the house or tunnel.

Vinyl chloride resin film is made by adding a plasticizer to vinyl chloride resin to give it flexibility, and has the characteristic that it can be easily coated on houses or tunnels of various shapes, making it widely used as a coating material. It is also the reason why

However, due to the flexibility of the film, blocking occurs between the films during ventilation work or opening/closing work in a house or tunnel, resulting in a problem in that work efficiency is reduced.

In order to improve this blocking, polyethylene wax, fatty acid alkali metal salts, amide compounds, amorphous inorganic solid particles, etc. are added as anti-blocking agents, but polyethylene wax, fatty acid alkali salts, amide compounds, etc. bleed to the surface,
There is a drawback that the high-frequency adhesive strength of the film is impaired, and since a large amount of amorphous inorganic solid fine particles are added, transparency and strength are reduced. Also, JP-A-1-
As in Japanese Patent No. 210448, inert solid fine particles that absorb in the infrared region are used, and the particle size ranges from 2 to 10 μm and 2 μm.
Although a method combining particle size distributions in a range of less than m has been proposed, it has not been fully satisfied because transparency decreases.

[Problem to be solved by the invention]

The purpose of the present invention is to overcome the above-mentioned problems in terms of transparency and strength.
An object of the present invention is to provide an agricultural vinyl chloride resin film in which blocking between films is prevented.

[Means to solve the problem]

As a result of intensive study on the above-mentioned problem, the present inventors have found that the present invention can be achieved by forming a film from a resin composition containing a certain range of solid fine particles in a vinyl chloride resin, and have completed the present invention.

That is, the present invention provides an agricultural vinyl chloride-based resin, characterized in that 0.6-2.5 parts by weight of solid fine particles having a particle size of 7-10 μm and a constant shape are added per 100 parts by weight of a vinyl chloride-based resin. It is a resin film.

The present invention will be explained in detail below.

The vinyl chloride resin in the present invention refers to polyvinyl chloride,
Copolymers mainly composed of vinyl chloride with other comonomers,
Mixtures of these or mixtures of these with other polymers or copolymers can be used.

The particle size in the present invention (according to the call counter method) is 7
As the solid fine particles of ~10 .mu.m, polyhedral or spherical aluminosilicate or silica having a uniform shape is preferably used because of its high anti-blocking effect. Particle size is 7μm
If the amount is less than this, the anti-blocking effect tends to be poor; if it is added in a large amount, blocking can be prevented, but this is not preferable because the transparency and strength will decrease (and the cost will increase).

101! If it exceeds m, transparency and strength will decrease, which is not preferable.

The amount of the aluminosilicate and/or silica added is preferably 0.6 to 2.5 parts by weight per 100 parts by weight of the vinyl chloride resin. If it is less than 0.6 parts by weight, a sufficient anti-blocking effect cannot be obtained, and if it exceeds 2.5 parts by weight, although a sufficient anti-blocking effect can be obtained, transparency and strength are undesirably reduced.

A plasticizer is usually blended into the agricultural vinyl chloride resin film of the present invention, but there are no particular restrictions on the plasticizer. ,
Aliphatic dibasic acid esters such as diptyl sebacate, butyl oleate, fatty acid esters such as methyl acetyl ricinoleate, glycol esters such as diethylene glycol dibenzoate, tricresyl phosphate,
Examples include phosphoric acid esters such as triphenyl phosphate, epoxidized oils such as epoxidized soybean oil and epoxidized linseed oil, and other plasticizers with various structures such as polyester-based plasticizers, which can be used alone or in combination of two or more. It is used as The blending ratio to vinyl chloride resin is 100% resin.
A range of 30 to 60 parts by weight is suitable.

Other additives such as antifogging agents, antifogging agents, lubricants, heat stabilizers, coloring agents, ultraviolet absorbers, etc. may be added to the agricultural polyvinyl chloride resin film in the present invention as necessary. .

Various known means can be employed to produce the agricultural vinyl chloride resin film in the present invention. For example, a mixture can be obtained by using a mixer such as a Henschel mixer, a ribbon blender, or a tumbler. The obtained mixture can be made into a film as it is or after being pelletized by, for example, a T-die extrusion method, an inflation method, a calender method, or the like.

〔Example〕

Hereinafter, the present invention will be explained in detail with reference to Examples.

The method for measuring physical properties in the present invention is as follows.

(a) Wrap a blocking film around a 20 mm diameter iron pipe to prevent air from entering it, and then place it in a gear open oven at 70°C for 1 hour. After leaving the iron pipe taken out at room temperature for 1 hour, the state of bronzing when the film was peeled off was sensory evaluated.

◎ ○ △ ××× Resistant (Peeling) Very strong resistance (b) Transparency D of rupture manufactured by Toyo Seiki in accordance with JTS K 7105
IRECT IIEADING IIAZE METE
Measure haze using R.

(c) Measuring the Elmendorf tear load in an agricultural polyvinyl chloride film of strength JTS K-6732.

Examples 1 to 6, Comparative Examples 1 to 5 Aluminosilicate (product name: Silton AMT), a product of Suikagaku Kagaku Kogyo fil, as solid fine particles with a fixed shape
and silica (trade name: Silton AMT Silica) were added in the amounts shown in Table 2 to the basic formulation shown in Table 1, and mixed with stirring using a Henschel mixer. Next, the mixture was melt-kneaded at 170°C using a mixing roll, and then a film having a thickness of 0.05 mm was formed at 170°C using an inverted calendar. Table 2 shows the results of measuring the physical properties of the obtained film.

Mark 9 in Table 1: Average degree of polymerization 1400 [Effect of the invention] Particle size is 7 to 10 μm per 100 parts by weight of vinyl chloride resin
The agricultural vinyl chloride resin film of the present invention to which 0.6 to 2.5 parts by weight of aluminosilicate-1 and/or silica of a certain shape is added has a markedly improved anti-blocking effect and improved transparency and It also has excellent strength and can be suitably used as an agricultural covering material.

Claims (1)

[Claims] 1. In the agricultural vinyl chloride resin film, 0.6 to 2.5 parts by weight of solid fine particles with a particle size of 7 to 10 μm and a constant shape are added per 100 parts by weight of the vinyl chloride resin. An agricultural vinyl chloride resin film that is characterized by the ability to 2. The agricultural vinyl chloride resin film according to claim 1, wherein the solid fine particles having a constant shape are polyhedral or spherical aluminosilicate and/or silica.