JPS61296050A - Chlorine-containing resin composition - Google Patents

Abstract

PURPOSE:To provide a chlorine-containing resin composition for agricultural film having excellent anti-sticking property, anti-fogging property and plate-out resistance, by compounding a chlorine-containing resin with an anti-sticking agent and a specific dipentaerythritol fatty acid ester. CONSTITUTION:100pts.(wt.) of a chlorine-containing resin (e.g. vinyl chloride polymer) is compounded with (A) 1-3pts. of one or more kinds of anti-stick agents (e.g. sorbitan monostearate) and (B) 0.2-2pts. of a fatty acid ester having 8-18C fatty acid residue and produced by reacting dipentaerythritol having particle diameter of <=74mum with a fatty acid at a molar ratio of 1:(1-3).

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a chlorine-containing resin composition for agricultural films that has excellent droplet properties, fog prevention properties, and plate-out resistance.

Chlorine-containing resins, such as vinyl chloride resin, have heat retention,
Due to its excellent weather resistance and economic efficiency, it is widely used as an agricultural film for greenhouse cultivation, tunnel cultivation, etc.

This reduces the permeation of water, making it unfavorable for crop growth.Therefore, in order to prevent water droplets from adhering to the film, some type of droplet agent is kneaded into the film, and it has come to be used commercially as a droplet film or a drip-proof film.

However, greenhouses and tunnels that use agricultural chlorine-containing resin films that contain such droplet agents have superior droplet flow properties than those that use agricultural chlorine-containing resin films that do not contain droplet agents. It has become clear that while it has the advantage of extremely reducing the number of rings of water droplets, it also has the disadvantage of significantly generating n (sometimes called mist) when the temperature changes rapidly, such as in the morning and evening. Ta.

This mist edge often occurs during the winter, which is the most important time for greenhouse cultivation and tunnel cultivation, and it causes a decline in workability, and although it is not clear whether it is related to the origin of the Song, it can prevent the occurrence of diseases, reduce buds falling, etc. This phenomenon is said to cause fruit drop, and is highly criticized by gardeners. Until now, various methods have been proposed to suppress or prevent the occurrence of fog, but none of them have been sufficiently effective, and an effective method has been eagerly awaited.

In addition, plate-out is a phenomenon in which a part of the compounding agent precipitates and adheres to the metal surface of the molding machine, such as the roll surface of a calender roll, due to long-term heating when chlorine-containing resin is molded. The out phenomenon not only damages the appearance and surface properties of the molded product, but also
This results in the disadvantage of significantly reducing productivity.

In view of these problems, the present inventors conducted various studies and found a chlorine-containing resin composition for agricultural film that is superior in fog prevention properties and plate-out resistance without any requirements for droplet flow properties. .

That is, in the present invention, 1 of the +al droplet agent is added to the chlorine-containing resin.
The present invention provides a chlorine-containing resin composition for agricultural film, characterized in that it contains one or more fatty acid esters obtained by reacting dipentaerythritol with a particle size of at least 174 μm and a fatty acid. be.

The chlorine-containing resin of the present invention is a vinyl chloride homopolymer or a vinyl-based resin mainly composed of vinyl chloride, such as a copolymer with vinyl acetate, vinylidene chloride, ethylene, propylene, methacrylic acid ester, or urethane resin. These include polymers, graft polymers, and blends with these resins.

Next, the droplet agent used in the present invention may be any agent as long as it has an effect of preventing the adhesion of water droplets, but suitable examples include sorbitan monostearate, sorbitan monopalmitate, sorbitan monolaurate, and polyoxyethylene solvate. Examples include tan monostearate, sorbitol monostearate, silicone surfactants, fluorine surfactants, and the like.

These may be used alone or in combination of two or more, and usually 10 to 30 weight parts are used in order to impart good droplet flow properties.

Next, the fatty acid ester of dipentaerythritol used in the present invention includes, for example, compounds obtained by reacting the compositions shown in the example compounds in Table 1.

These may be used alone or in combination of two or more, and are preferably used in an amount of 0.2 to 2 parts by weight based on the chlorine-containing resin.

Furthermore, dipentaerythritol used in the synthesis of the example compounds was obtained by finely pulverizing commercially available dipentaerythritol using a Kisho Kiima Sample Mill and sieving the powder using a standard sieve.

In addition, in the present invention, in order to meet the basically required performance as an agricultural film, various plasticizers, various stabilizers, metal soaps, lubricants, organic phosphite esters, organic phosphate esters, acid phosphate esters, or their It goes without saying that metal salts, pigments, antiblocking agents, ultraviolet absorbers, antioxidants, coloring inhibitors, light resistance improvers such as hindered amines, epoxy compounds, and the like may be used.

This will be explained in detail below using examples.

Example 1 The formulation in Table 2 was made into a film with a thickness of 01M using a calendar roll, and was placed on a farmland with a length of 15m, a width of 60cm, and a height of 500cm.
I put up the 1st house.

Plate-out property was evaluated by observing the calender roll surface during film processing.

Further, the fog prevention property and the droplet flow property were evaluated by visually observing the inside of the greenhouse in the morning and evening and evaluating the amount of fog generated, as well as the flow of water droplets on the inner surface of the film.

The house was expanded in December 1959.

10,000-4 days door 7 Tomisho Takashi f ※※※ Example 2 The composition of Table 3 was made into a 0.1-thick film using a calendar and placed on farmland with a length of 1.5 m, a width of 60 cm, and a height of 50 cm.
The house was set up.

Evaluation of plate-out properties, fog prevention properties, and droplet properties was carried out in Example 1.
The same evaluation was conducted.

The house was expanded in December 1959.

Sl − of i −O; lower 0=0,′X Note that the respective evaluations in Group 22 Table 3 are as follows.

Fog generation status ◎: No fog generation observed ○: Little fog generation Δ: Significant amount of fog generated ×: Significant generation of n Plate-out property ◎: No deposits observed on the roll surface o: O Slight adhesion is observed on the surface of the first layer Δ: 0 Considerable adhesion is observed on the surface of the first layer ×: Significant adhesion is observed on the roll surface Flowability ◎: No adhesion of water droplets is observed ○: Little adhesion of water droplets

Claims (1)

[Claims] 1) A chlorine-containing resin containing (a) one or more droplet agents and (b)
A chlorine-containing resin composition for agricultural film, characterized in that it contains one or more fatty acid esters obtained by reacting dipentaerythritol having a particle size of 74 μm or less with a fatty acid. 2) Agriculture according to claim 1, wherein the fatty acid group of the fatty acid ester of dipentaerythritol is a C_8-C_1_8 fatty acid group, and the reaction molar ratio of dipentaerythritol and fatty acid is 1:1 to 1:3. Chlorine-containing resin composition for film.