JPH0728612B2 - Coating material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drip accelerating coating material, and by imparting drip accelerating performance to a coating material that constitutes a house in greenhouse cultivation of farm products, water vapor generated from the ground is used as a coating material. The present invention relates to a coating material for accelerating droplets, which can prevent condensation on the inner surface, the condensed water falling to the lower part, and causing a disease in agricultural crops in a house to reduce the yield.

[0002]

2. Description of the Related Art Conventionally, a polyvinyl chloride film mixed with a surfactant has been widely used as a drop accelerator in an agricultural house. It has the features of being easy to use and cheap in cost,
There is a drawback that the duration of the drip performance is only about one year, and the life of the film itself is as short as 2 to 3 years. Furthermore, the treatment of this film as an industrial waste has become a problem in recent years.

The polyethylene film has the same quality as the above, but its versatility is poor due to its low light transmittance and its shorter service life.

Further, in recent years, a polyester film has come to be used as a covering material, but the drop performance is exhibited only for a short period of time like the polyvinyl chloride film. In particular, a coating material that utilizes the water absorption of polyvinyl alcohol is used as a coating material that takes dew condensation into consideration.This is effective for a small amount of dew condensation, but when a large amount of continuous dew condensation occurs. A decrease in the absorption of dew condensation is unavoidable. Further, the polyvinyl alcohol type becomes hard when dried and is difficult to handle.

In addition to the above-mentioned types of coating materials, there are glass, FRP, acrylic resin plates, polycarbonate resin plates, etc. as long-term durability coating materials, but they are generally expensive and inflexible, and are generally used. Cannot be used for traditional pipe houses.

[0006]

In view of the above-mentioned problems in the coating material for accelerating droplets, the present inventor has a permanent effect of accelerating the droplets due to dew condensation and is economical. As a result of earnest studies for obtaining such a coating material, the present invention has been achieved.

That is, according to the present invention, as shown in the drawing, the light transmittance is 30 to 80% and the tear strength is vertical to the back surface of the cellulosic film 1 saponified to a depth of 20 to 60% of the film thickness. A droplet having a three-layer structure in which a woven or non-woven fabric having a horizontal width of 1.0 kg / 3 cm or more is laminated as the reinforcing material 2 and the transparent synthetic resin film layer 3 is coated on the other surface of the reinforcing material. It is intended to provide a facilitating dressing.

[0008]

The present invention uses a partially saponified cellulosic film as a surface material that permanently fluidizes dew condensation on the inner surface, thereby preventing the formation of dew condensation on the inner surface of the coating material and preventing the formation of dew condensation water. By continuously discharging it to the outside to prevent condensation from falling and increasing the humidity inside the house, light scattering due to condensation is prevented and the light transmittance to the inside of the house is increased, resulting in a crop caused by mold caused by high humidity. It is possible to eliminate a decrease in productivity such as poor growth and poor growth due to disease or disease.

From the surface used in the present invention, the film thickness of 20 to
Cellulose-based film 1 which is partially saponified to a depth of 60% includes cellulose diacetate, cellulose triacetate, or cellulose propionate film.
Alternatively, saponification is carried out by immersion treatment in an aqueous solution containing a required amount of potassium hydroxide or an aqueous solution containing benzyl alcohol, in which case the concentration of the alkaline aqueous solution, the immersion temperature and the immersion time are controlled. As a result, partial saponification up to a depth within the range of 20 to 60% of the thickness of the saponified film can be arbitrarily performed.

The light transmittance of the reinforcing material 2 of the partially saponified cellulose-based film 1 laminated on the back surface of the film 1 is 30 to 80%, and the tear strength is 1.0 Kg / 3 cm or more in both vertical and horizontal directions. As the woven or non-woven fabric, it is preferable to use polyester fiber as a main component from the viewpoint of strength and economy, and rayon, nylon, polypropylene, cotton, etc. may be used alone or as a mixed fiber. The light transmittance is adjusted by the thickness of the thread used, the fiber density (porosity), the thickness, and the like.

The synthetic resin film layer 3 coated on the other side of the woven or non-woven fabric 2 laminated with the partially saponified cellulosic film 1 to impart weather resistance, durability and stain resistance is an acrylic resin layer. There are resins, urethane-based resins, fluorine-based resins, polyester-based resins, vinyl acetate-based resins, and the like, and these resins may be formed into a film or by coating with a paint made of these resins. Also, coloring is possible, and a specific wavelength can be selected by selecting additives and pigments.

[0012]

EXAMPLES The present invention will be described in detail below with reference to examples. Example 1 30 g of a cellulose triacetate film having a thickness of 25 μ was prepared by temporarily adhering a polyethylene film to the entire back surface in a warming chemical solution of 50 ° C. to which 150 g of sodium hydroxide, 150 g of potassium hydroxide and 30 g of benzyl alcohol were added per 1000 g of water. It was immersed for a minute to carry out a partial saponification treatment to a depth of 10 μ from the surface. Then, the polyethylene film on the back surface of the partially saponified cellulose triacetate film was peeled off, and a light transmittance of 70 was applied to the back surface side.
%, A density of 30 g / cm ² , a tear strength of 4.1 Kg / 3 cm in both lengthwise and widthwise, a 0.2 mm thick non-woven fabric is laminated as a reinforcing material through an adhesive, and the back surface of this reinforcing material is weather resistant. A 100 μ thick acrylic resin film having excellent transparency was laminated to obtain a coating material of the present invention.

The obtained coating material was used as a roof material of a pipe house for tomato cultivation, with the surface of the cellulose triacetate film partially saponified inside, and compared with tomato cultivation in a pipe house using a conventional polyvinyl chloride film as the roof material. As a result, the amount of sunlight received by the house increased by 30% or more, and the flow suitability of the inside wall of the house was improved, and the tomato seeds improved, and the number of diseases such as gray mold caused by the fall of the dew condensation water was the same as before. 50% or more of the house with the polyvinyl chloride film of
It was confirmed that the amount decreased to 20% or less. In addition, when a burning test of the used covering material was performed, no toxic gas was detected.

Example 2 100 g of sodium hydroxide and 200 g of potassium hydroxide were added to 1000 g of water, and the back surface was masked with a polyethylene film in a warming chemical at 60 ° C.
A μ cellulose diacetate film was immersed for 45 minutes to perform partial saponification treatment from the surface to a depth of 20 μ.
Next, a net-like woven fabric made of nylon fiber having a thickness of 0.3 mm and a light transmittance of 35%, a density of 50 g / cm ² , and a tear strength of 10 Kg / 3 cm on both sides is peeled on the back side from which the polyethylene film is peeled off. As a result, a polyurethane resin coating material was coated on the back surface and dried by heating to form a transparent polyurethane coating layer having good weather resistance to obtain a coating material of the present invention.

The obtained covering material was used as a heat-insulating lining material in a glass-growing greenhouse so that the central part of the covering material had a high center part and the both ends were slightly lower, with the surface of the partially saponified cellulose diacetate film facing inside. When it was kept warm with heavy oil at night in winter, the dripping property of the inside of the greenhouse was remarkably improved, almost no dew condensation water dropped on the nursery beds, and no root rot occurred. The coating material after use was burned, but no toxic gas was detected. Note that this invention
The light transmittance of the covering material is slightly reduced, but
Sheet, polycarbonate sheet, vinyl chloride sheet
It can be used by attaching it to a plastic sheet or glass plate such as
It can also be used.

[0016]

Industrial Applicability As described above, the coating material of the present invention imparts permanent flowability by using a partially saponified cellulosic film having an affinity for water on its inner surface. As a reinforcing material for reinforcement, a woven or non-woven fabric whose light transmittance can be adjusted is laminated, and its durability and weather resistance are given by laminating a transparent synthetic resin film layer. It has an excellent effect of accelerating the drip in the greenhouse, and it has a great effect in reducing the light transmittance due to dew condensation, and preventing productivity deterioration due to poor growth of crops and disease caused by falling dew condensation. Admitted.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing the structure of a coating material for promoting droplets according to the present invention.

[Explanation of symbols]

 1 partially saponified cellulose-based film 2 reinforcing material 3 synthetic resin film layer

Claims (3)

[Claims] 1. A cellulosic film saponified to a depth of 20 to 60% of the film thickness from the surface to the back has a light transmittance of 30 to 80% and a tear strength of 1.0K in both the vertical and horizontal directions.
A drip accelerating coating material obtained by laminating a woven or non-woven fabric having a g / 3 cm or more as a reinforcing material and further coating a transparent synthetic resin film layer on the other surface side of the reinforcing material. 2. The coating material for accelerating flow of drops according to claim 1, wherein the cellulose-based film is a cellulose diacetate film, a cellulose triacetate film or a cellulose propionate film. 3. The drop promoting coating material according to claim 1, wherein the synthetic resin film layer comprises a film or coating of acrylic resin, urethane resin, fluorine resin, polyester resin or vinyl acetate resin.