JPH06104764B2 - Transparent polyvinyl chloride resin film for agriculture - Google Patents

Description

The present invention relates to an agricultural polyvinyl chloride resin (hereinafter abbreviated as PVC) film.

Specifically, the transparency is characterized by using Al (OH) ₃ having a high absorption spectrum in the infrared region of wavelengths 7 to 16 μ, and Mg (OH) ₂ having a high absorption spectrum in the infrared region of wavelengths 17 to 40 μ. And a PVC film for agriculture with good heat retention.

(Prior Art) It is known that an additive having an absorption spectrum in the infrared region of 3 to 40 μ is effective in improving the heat retaining property of this type of film, and Japanese Patent Publication No. 47-47903 discloses anhydrous fine silicic acid. 47-9260 is a phosphate compound, JP-B-57-34871 is a hydroxide-containing magnesium, and JP-A-58-138745 is at least one magnesium carbonate / magnesium silicate / silicon oxide and magnesium hydroxide. And three types of additives such as phosphoric acid metal salt are disclosed, but these have a problem of weather resistance such as discoloration when used for a long time which improves heat retention, heat retention, transparency and processability.・ We did not satisfy all requirements such as weather resistance.

(Purpose) The present invention improves on this point, and particularly provides an agricultural PVC film excellent in heat retention, transparency, and weather resistance.

(Structure) The basic structure of the present invention is that, in addition to ordinary plasticizers, stabilizers, non-dripping agents, etc.
H) ₃ to the resin composition in an amount of 8 to 15% by weight of Al (OH) ₃ and 1
It was completed by using Mg (OH) ₂ in an amount of ˜4% by weight as an auxiliary agent.

The PVC-based resin in the present invention includes PVC other than PVC as a main component of copolymerization and other mixtures, and plasticization means 30 to 70 parts by weight of a plasticizer per 100 parts by weight of PVC, a phthalic acid derivative that is usually used. , Adipic acid derivatives, maleic acid, trimellitic acid, citric acid, stearic acid, phosphoric acid and other derivatives, epoxy derivatives, polyester type polymerized plasticizers, etc. can be used. Compounding agents usually used for PVC films such as surfactants, lubricants, antistatic agents, and ultraviolet absorbers are used.

Aluminum hydroxide is preferably blended with a small amount of magnesium hydroxide, and is preferably 8 to 15% by weight with respect to the resin composition. If it is less than 8% by weight, the heat retention property is lowered, and if it is 15% by weight or more, it becomes It was found that the basic physical properties deteriorated, and the magnesium hydroxide contained aluminum hydroxide 8% to 15%.
Below 1 to 4 parts by weight of magnesium hydroxide gives good heat retention as well as transparency, weather resistance, and strength, and if it is 4% by weight or more of magnesium hydroxide, the weather resistance may deteriorate. found.

These heat-retaining agents having a particle size of 50 μm or less, preferably 10 μm or less are well dispersed in the resin. In addition, those treated with a surface treatment of fatty acid and the like have good dispersion, and basic physical properties such as tensile strength are improved.

The film is formed to a thickness of 0.01 mm to 0.2 mm by a conventional method.

(Example) Next, an explanation will be given with reference to Examples and Comparative Examples. PVC (P = 1300) D with the formulations shown in Examples 1 to 6 and Comparative Examples 1 to 11 in Table 1.
The base compound of OP / TCP, an epoxy plasticizer, a stabilizer and a non-dripping agent is mixed with a predetermined amount of Al (OH) ₃ , Mg (OH) ₂ of the present invention and a comparative predetermined amount of Al (OH) ₃ , Mg ( OH) ₂ and silicon silicide were mixed for 10 minutes with an ordinary super mixer, and a 0.05 mm film was prepared by a calendar heated to 170 ° C. and evaluated.

The evaluation was performed by the following methods.

For heat retention, a house was created from each film, and the beginning of December, 59
Average of room temperature at midnight for 10 days.

The weather resistance was judged by the degree of deterioration one year after outdoor exposure.

The basic physical properties were comprehensively evaluated by measuring the tensile strength, elongation and tearing force of the film.

The transparency was visually evaluated.

The weather resistance is evaluated as ○, no deterioration, △ is slightly deteriorated, × is considerably deteriorated, and basic physical properties and transparency are evaluated as ○, and Δ is slightly inferior. As described above, the present invention relates to a plasticized PVC resin or a copolymer thereof, which contains 8 to 15% by weight of aluminum hydroxide and 1 to 1 of the resin plastic material.
Since the composition containing 4% by weight of magnesium hydroxide was used for film formation, the film was an invention of an agricultural vinyl chloride resin film in which transparency, heat retention, weather resistance, and basic physical properties were well balanced. Is.

Claims (1)

[Claims] 1. A composition comprising a plasticized polyvinyl chloride resin or a copolymer thereof containing 8 to 15% by weight of aluminum hydroxide and 1 to 4% by weight of magnesium hydroxide based on the resin composition. A polyvinyl chloride resin film for agriculture.