JPH0741625A - Resin composition and film for agricultural purposes - Google Patents

Abstract

PURPOSE:To obtain a resin composition and films for agricultural purposes having metallic gloss, excellent thermal stability, enabling reduction in waste matters with effective utilization of resources, increased recycling percentage and reduced environmental disruption and showing high weather resistance, light weight, temperature-rise prevention and moisture evaporation prevention. CONSTITUTION:100 pts.wt. of vinyl chloride resin are mixed with 1 to 15 pts.wt. of a petroleum resin to give the objective resin composition. The films for agricultural purposes is produced by forming said resin composition into films of 0.02 to 0.5mm thickness.

Description

Detailed Description of the Invention

[0010]

TECHNICAL FIELD The present invention relates to a resin composition and an agricultural film. More specifically, it has a metallic luster, excellent thermal stability, can reduce the amount of waste generated, can effectively use resources, can improve the recycling recovery rate, can reduce environmental damage, and can be excellent in weather resistance and light weight. The present invention relates to a resin composition and an agricultural film which are excellent in light-shielding property and temperature rise preventing property.

[0011]

2. Description of the Related Art The purpose of an institutional horticultural house is to adjust the growth environment of useful crops and to arbitrarily adjust the harvest time of crops by forcing or restraining cultivation. The growth of crops is affected by temperature and light, and the degree of growth depends on crop crops. Therefore, it is necessary to select a suitable greenhouse covering material for the crops. In order to block the radiant heat in the summer and prevent the heat from staying in the house (temperature rise prevention), there is a net-shaped gauze cloth. As one of the covering materials, a silver vinyl blended with polyvinyl chloride resin and aluminum powder. The so-called film is used for shading and blocking infrared rays.

[0012]

[Problems to be Solved by the Invention] However, a film containing an aluminum powder, silver vinyl, has a problem that it is discolored in a few months when used outdoors because of its poor weather resistance. Not effective. In addition, since the aluminum powder is used, the film becomes heavy and difficult to handle. For this reason,
In 63584, there is proposed a method in which the amount of aluminum powder is reduced to compensate for the effect of insufficient white pigment such as titanium oxide and carbon black. However, the weather resistance of the film is not sufficient and it is heavy and difficult to handle. However, the drawback is not improved. In addition, silver powder mixed with aluminum powder promotes thermal deterioration if it is kneaded with other agricultural vinyl chloride films during recycling, and as a result, the quality of recycled products is significantly reduced. is there. There is a strong demand for reduction of waste generation and effective use of resources, and the recycling recovery rate of vinyl chloride film for agriculture is also increasing. Agricultural film that can replace silver vinyl containing aluminum powder is also a requirement of the times. An object of the present invention is to solve these problems and to provide an agricultural film that is excellent in light-shielding properties and weather resistance, is lighter, and is easy to handle in recycling.

[0013]

Means for Solving the Problems As a result of repeated studies for solving the above-mentioned problems, the present inventor has found that the following objects can be achieved. The first invention is a resin composition characterized by mixing 1 to 15 parts by weight of a petroleum resin with 100 parts by weight of a vinyl chloride resin, and the second invention is based on 100 parts by weight of a synthetic resin. Using a resin composition containing 1 to 15 parts by weight of a petroleum resin, a thickness of 0.02 to 0.5
It is an agricultural film characterized by being mm.

As the synthetic resin of the present invention, a thermoplastic resin such as vinyl chloride resin, low density polyethylene, linear low density polyethylene, or ethylene vinyl acetate copolymer is used. Of these, vinyl chloride resins are preferable, and examples thereof include polyvinyl chloride, copolymers of vinyl chloride as a main component with other monomers, and polymer blends of these with other synthetic resins. The degree of polymerization of vinyl chloride resin is 7
The range of 00 to 2000 is preferable.

The petroleum resin of the present invention may be any one obtained by polymerizing diolefins and olefins contained in a cracked oil fraction obtained from steam cracking of petroleum naphtha without isolation. Of these, cyclopentadiene-based petroleum resin is preferable. Cyclopentadiene obtained from steam cracking of petroleum naphtha, etc.
A distillate containing dicyclopentadiene and its multimer or a mixture thereof as a main component in the presence or absence of a solvent in an atmosphere of an inert gas such as nitrogen gas, preferably at a temperature of 220 to 320 ° C. In the above, a cyclopentadiene-based petroleum resin polymerized under a pressure higher than that which can hold the polymerization system in a liquid phase, and a method known in the prior art, that is, a metal such as palladium, nickel, cobalt, or an oxide thereof is used. A hydrogenated cyclopentadiene-based petroleum resin or a mixture thereof which is hydrogenated in the presence of a solvent using a catalyst. The fraction may be polymerized in one stage, but may be polymerized in two or more stages, for example, dicyclopentadiene is polymerized in two stages, and the polymerization process, the polymerization and the hydrogenation process may be continuous or badge. But it's okay. The softening point of the cyclopentadiene-based petroleum resin thus obtained is not particularly limited.

The composition of the present invention includes a plasticizer, a heat stabilizer, a light stabilizer, an ultraviolet absorber, a lubricant, an antifogging agent, an antifog agent,
A colorant can be added. In the present invention, preferred plasticizers include, for example, phthalic acid esters, adipic acid esters such as di-2-ethylhexyl adipate (DOA) and diisononyl adipate (DIDA), and phosphoric acid esters such as tricresyl phosphate (TCP). And epoxidized soybean oil. Examples of heat stabilizers and light stabilizers include metal soaps such as zinc stearate, calcium stearate, and barium stearate; organic tin compounds such as dibutyltin laurate; alkylzinc phosphate; aryl barium phosphate; Examples thereof include metal salts of organic phosphates, phosphites, β-diketones such as dibenzoylmethane, epoxy resins, phenol antioxidants, hindered amine light stabilizers, and the like.

Examples of the ultraviolet absorber include benzophenone-based and benzotriazole-based ultraviolet absorbers.
Examples of lubricants include stearic acid and higher alcohols. As the antifogging agent, for example, sorbitan-based surfactants such as sorbitan monostearate and sorbitan monobehenate, glycerin-based surfactants such as diglycerin monopalmitate or their alkylene oxide adducts, etc., alone or in combination. Can be used. Examples of the antifogging agent include fluorine-containing surfactants. Examples of the colorant include carbon black and titanium white.

The blending amount of these additives with respect to 100 parts by weight of the synthetic resin of the present invention is such that the plasticizer is 30 to 60.
Parts by weight and other additives are preferably in the range of 5 parts by weight or less. The agricultural film of the present invention comprises a ribbon blender, a high speed mixer, a petroleum resin in an amount of 1 to 15 parts by weight, and optionally the above additives added to 100 parts by weight of a synthetic resin.
It can be manufactured by mixing with Banbury, two rolls or the like to form a composition, which is molded by a calendering method, a T-die molding method or an inflation molding method. In the above molding, stretching can be applied during molding. For example, in the calendering method, it can be stretched simultaneously or sequentially in a vertical direction and a horizontal direction by a tenter at an arbitrary ratio. The thickness of the film is 0.02 to 0.
It is 5 mm, preferably 0.04 to 0.2 mm.

[0019]

EXAMPLES The present invention will be described below with reference to examples.
The test method is as follows. Molding processability: The state of kneading the compositions of Examples and Comparative Examples with two rolls at 175 ° C was visually observed. In the evaluation, a good kneading state was evaluated as ◯, a sample having a relatively long kneading time as compared with the good kneading was evaluated as Δ, and a plate out during the kneading operation was evaluated as x. Specific gravity: According to JIS-K7112 underwater displacement method. The smaller the number, the lighter and easier to handle. Metallic luster: Whether or not metallic luster was observed was visually observed. ○ with a metallic luster
What was not recognized at all was marked with X, and what was recognized a little was marked with Δ. The one with a metallic luster is better as silver vinyl.

Light-shielding rate; ASTM-D1003
by. The smaller the total light transmittance is, the larger the light blocking rate is, and thus the better the light blocking property is. Weather resistance: According to JIS-A1415 WS type.
The irradiation time until the residual elongation of the film reaches 50% is tested. The longer the irradiation time, the better the weather resistance. Recyclability: According to JIS-K6723 thermal stability test. The time until the blue color of the Congo red test paper changes is measured. The longer the time, the better the thermal stability and therefore the recyclability. Temperature rise prevention: height 70 cm, width 1 m, length 1.5 m
The film of Example Comparative Example is applied to the mini house of No. 3, and the temperature inside the house during July and July is measured. The lower the temperature, the more the temperature rise is prevented, and the more excellent silver farming.

Examples 1 and 2, Comparative Examples 1 to 5 Polyvinyl chloride (average degree of polymerization 1300) 100 parts by weight di-2-ethylhexyl phthalate 40 〃 Tricresyl phosphate 3 〃 Epicoat 828 1 parts by weight Barium-zinc composite stabilizer 2.5 〃 sorbitan monostearate 2 〃 methylene bis stearoamide 0.5 〃 calcium carbonate 10 〃, add the ingredients of the composition of Appendix 1 to it, mix for 10 minutes with a Henschel mixer, and then these compositions 175
The mixture was kneaded with two rolls at 0 ° C. to form a film having a thickness of 0.075 mm. As the petroleum resin, cyclopentadiene-based petroleum resin: Marukalets H- manufactured by Maruzen Petrochemical Co., Ltd.
970 was used. Further, Altop S-7 manufactured by Tokai Metal Co., Ltd. was used as an aluminum powder as a comparative example.
These films had a metallic sheen. Further, the processability during roll forming, the specific gravity, the glossiness, the light blocking ratio, the weather resistance, and the recyclability were measured. The results are shown in Table 1.

[0022]

[Table 1] * 1: Marukaretsu H-970, manufactured by Maruzen Petrochemical Co., Ltd. * 2: TR-700, manufactured by Fuji Titanium Industry Co., Ltd. * 3: TXHE-0061, manufactured by Toyo Ink Mfg. Co., Ltd. * 4: Altop S-7, manufactured by Tokai Metal Co., Ltd.

[0023]

EFFECT OF THE INVENTION The resin composition and the agricultural film of the present invention had a metallic luster without using aluminum powder. The resin composition having a metallic luster and the agricultural film of the present invention do not use aluminum powder, and thus have excellent thermal stability and therefore excellent recyclability, which reduces the amount of waste and effectively uses resources. It was possible to improve the recycling collection rate and reduce environmental damage. Further, the resin composition and the agricultural film of the present invention were excellent in weather resistance, light in weight, and excellent in light-shielding property and temperature rise preventing property.

Claims (2)

[Claims] 1. A resin composition comprising 100 parts by weight of a vinyl chloride resin and 1 to 15 parts by weight of a petroleum resin. 2. A petroleum resin is added to 100 parts by weight of a synthetic resin.
Using a resin composition containing 15 parts by weight, a thickness of 0.02
Agricultural film characterized by being 0.5 mm.