JPS6227452A - Composition for agricultural vinyl resin sheet - Google Patents

Abstract

PURPOSE:To provide the titled compsn. for the production of sheets, which has good blocking resistance and excellent workability and is suitable for use in the production of covering materials for a greenhouse, by blending a plasticizer with a vinyl chloride/allyl (meth)acrylate copolymer having a specified composition. CONSTITUTION:30-70pts.wt. plasticizer (e.g. diethylhexyl phthalate or epoxidized soybean oil) is mixed with 100pts.wt. copolymer composed of 79-99.99wt% vinyl chloride and 3-0.01wt% allyl (meth)acrylate to obtain the desired compsn. for the production of agricultural vinyl resin sheet. If desired, thermal stabilizer, anti-stick agent, ultraviolet absorber, antioxidant, inorg. filler, etc. may be added. The resulting compsn. does not cause blocking phenomenon. Hence, when the resulting sheet is used as a inner curtain, the drawing operation of the curtain can be easily conducted day and night.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Technology] The present invention relates to a composition for agricultural vinyl resin sheets based on plasticized vinyl chloride resin, which has good blocking resistance.

[Conventional technology]

Due to its excellent mechanical properties and economic efficiency, vinyl chloride resin is widely used as an agricultural material, particularly as films and sheets for greenhouse coatings.

However, plasticized vinyl chloride resin causes a blocking phenomenon between films or sheets due to leaching of the plasticizer or other causes, resulting in reduced workability during processing of the film or sheet. Furthermore, when used as a covering material for a single industry, especially when used as a lining curtain, a great deal of effort is required to open and close the curtain in the morning, and workers have strongly requested an improvement.

Conventionally, in this field of application, there are: - those with the texture of satin-like textures transferred;
■ Film sheets based on copolymers of bisphenol-modified diacrylate and vinyl chloride, ■ Film sheets based on highly polymerized vinyl chloride resin, ■ Film sheets with less stickiness by reducing the number of plasticizers, etc. have been proposed. ing.

- Satin grained film improves stickiness, but has the disadvantage that the grained surface is easily contaminated with dust and is difficult to wash once contaminated.

■Furthermore, a film based on a copolymer of bisphenol-modified diacrylate and vinyl chloride is good in that it is less sticky during production.

When in use, moisture adheres to the entire surface of the film, resulting in a complete loss of slipperiness, making it impossible to open and close the curtain.

(2) Products based on highly polymerized vinyl resins do not have the above-mentioned drawbacks, but they still have problems such as reduced productivity during film production using a calendar or extruder, and increased raw material costs.

■If the stickiness is eliminated by reducing the number of plasticizer ffl,
The flexibility, tear strength, cold resistance, etc. of the film decrease.

[Purpose of the invention]

As a result of intensive studies, the present inventors aimed to improve the workability of agricultural covering materials, especially lining curtains, without impairing the transparency, weather resistance, and other mechanical properties of cyclized vinyl resin. Vinyl chloride 97.00-98.00% by weight (meth)
To 100 parts by weight of a copolymer consisting of 3.00 to 0.01% by weight of acrylic acid, add 30 to 80 parts by weight of a plasticizer and appropriate amounts of a necessary heat stabilizer, droplet agent, and UV inhibitor. The present inventors discovered that films and sheets made from resin compositions made from these resin compositions are extremely effective, and have completed the present invention.

As is clear from the above description, an object of the present invention is to provide a composition for an agricultural vinyl resin sheet that exhibits good blocking properties when formed into a film or sheet, and the sheet.

[Structure and effects of the invention]

The present invention has the following main feature (1).

(1) 97.0-99.99% by weight of vinyl chloride and 3.0-99.99% by weight of allyl acrylate and/or allyl methacrylate
An agricultural vinyl resin sheet composition comprising 100 parts by weight of a copolymer of 0.01% by weight and 30 to 70 parts by weight of a plasticizer.

The above-mentioned vinyl chloride copolymer used in the present invention is produced by ordinary suspension polymerization, and the content of allyl acrylate and/or allyl methacrylate (allyl meth)acrylate is 3.0% by weight. If it exceeds 0.01% by weight, the insoluble content of tetrahydrofuran will increase, resulting in significantly poor fluidity during processing and poor thermal stability, making it unsuitable for this purpose.On the other hand, if it is less than 0.01% by weight, blocking resistance will improve. Usually, it is practical in the range of 0.01 to 3.0% by weight, but the most suitable range is 0.03 to 1.0% by weight.

The plasticizer used in the present invention is not particularly limited as long as it is a plasticizer normally used for vinyl chloride resins, and phthalate-based, fatty acid ester, phosphoric ester-based, epoxy-based plasticizers, and the like can be used.

The amount thereof is 30 to 70 parts by weight based on 100 parts by weight of the copolymer used in the present invention, depending on the plasticizing efficiency of the plasticizer. As the thermal stabilizer, Ba--Zn based composite stabilizers and Ca--Zn based composite stabilizers are mainly used in consideration of transparency and economical efficiency.

As the droplet agent, sorbitan fatty acid esters, glycerin higher fatty acid esters, silicone oil, fluorine compounds, etc. are used.

As the ultraviolet inhibitor, benzotriazole compounds and benzophenone compounds are used.

Other necessary antioxidants, inorganic fillers, lubricants, pigments, etc. can be used as appropriate insofar as they do not impair the performance of the transparent vinyl chloride resin composition and films and sheets based thereon.

The present invention will be explained below with reference to Examples.

Examples 1-3, Comparative Examples 1-3 Allyl methacrylate 0.0. O05,0,01,0,
Diethylhexyl phthalate (hereinafter referred to as DOP) was added to 100 parts by weight of each vinyl chloride copolymer (A, B, C, D, E, F) containing 1, 1, 0 and 5.0 fig%, respectively. omitted) 45 parts by weight, epoxidized soybean oil2.
0 parts by weight, 3.0 parts by weight of tricresyl phosphite (hereinafter abbreviated as TCP), 2.5 parts by weight of Ba-Zn thermal stabilizer, 0.3 parts by weight of droplet agent, ultraviolet inhibitor (2-4 0.2 parts by weight of hydroxyl and benzophenone were mixed, and a sheet film of 0.10 m/11 was made using calendering equipment. The blocking properties (1) and (2) of the thus obtained film were measured and the results are shown in Table 1.

The physical properties of these materials were determined by the following method.

Blocking property (1) Film width 5m, height 2m1
It was expanded into a 25-meter-long Kamapoko-shaped house, and the presence or absence of blocking was examined during opening and closing operations in the morning and evening from March to May.

Blocking property (2) Two 50 mm square films are moistened and stacked together, a load of 50 g/c rn' is applied, and the film is left in a constant temperature bath at 40"C for 5 hours.Then, the film taken out is kept at a constant temperature of 23 °C. After cooling in a room for 2 hours, it was peeled off using a tensile tester and the force required for this was measured.

As for thermal stability, the film was suspended in an oven at 180° C. and its blackening time was measured.

As is clear from Table 1, Comparative Example 1.2 in which the content of allyl methacrylate in the copolymer was less than 0.01 had significantly greater blocking property than Examples 1 to 3. When the content is 5.0%, which is significantly higher than the 3.0% of the present invention, the blowing properties are good, but the thermal stability is significantly reduced and the physical properties are unbalanced.

Example 4, Comparative Examples 4 and 5 Copolymer (G) consisting of 3.90% by weight of vinyl chloride 9i and 0.1% by weight of polyethylene glycol diacrylate
, 260 parts by weight of DO, 2.0 parts by weight of epoxidized soybean oil per 100 parts by weight of each of copolymer (H) and copolymer C consisting of 99.90% by weight of vinyl chloride and 99.90% by weight of bisphenol-modified diacrylate o. Parts by weight TCP 3.0 parts by weight, Ba-Zn composite stabilizer 2.5 parts by weight Droplet agent 0.
Mix 3 parts by weight, sheeting 0.10 using calender equipment! A film of l/Im was made. Blocking properties (1) and (2) and thermal stability of the thus obtained film were measured in the same manner as in Examples 1 to 3.

The results are shown in the second column.

Claims (1)

[Claims] (1) 97.0-99.99% by weight of vinyl chloride and 3.0-99.99% by weight of allyl acrylate and/or allyl methacrylate
An agricultural vinyl resin sheet composition comprising 100 parts by weight of a copolymer of 0.01% by weight and 30 to 70 parts by weight of a solubilizing agent.