JP4553366B2 - Anti-sticking solution for agricultural vinyl chloride resin film - Google Patents

Description

  The present invention relates to an anti-sticking solution for agricultural vinyl chloride resin films, and in particular, prevents sticking between resin films when the resin film is rolled up or down for expansion work or ventilation. Regarding liquids.

  Conventionally, as a covering material for agricultural facilities such as agricultural houses and tunnels, soft vinyl chloride resin films, polyethylene films, ethylene-vinyl acetate copolymer films, polyester films, and synthetic resins such as these laminated films Film is being used. Among them, the soft vinyl chloride resin film is easy to mix various additives as compared with other synthetic resin films, and can impart various characteristics, so that light transmittance, moisture retention, This film is most widely used as a film excellent in mechanical strength, durability, workability and economy.

  However, the soft vinyl chloride resin film has excellent properties as described above, but various additives such as plasticizers, antifogging agents, stabilizers and the like blended into the surface side during use. However, the film is sticky and the films are brought into close contact with each other, so that the workability of the work for extending and lowering the film for ventilation and ventilation is poor.

Therefore, traditionally, the film surface of the ventilation part (the film winding and unwinding part) is treated with a satin pattern or powder is applied so that the film itself can be smoothly wound and unwound. Was done. For example, an embossing roll or the like is used to provide a textured surface on the film surface to prevent the film surfaces from sticking to each other (Patent Document 1), but the transparency of the film may deteriorate and hinder the growth of crops. In addition, it was insufficient to prevent sticking of the film surface due to bleeding such as plasticizer. Furthermore, it is necessary to carry out such processing at the time of production of the film, and it is necessary to cope with different use depending on the place where the film is spread, so that it is not easy to handle it.
Also, the method of preventing stickiness by spraying powders such as calcium carbonate and magnesium carbonate on the film surface has good initial effect, but the effect is lost as the powder comes off due to wind and rain. In addition, there was a problem in sustainability.

  Therefore, by adding fine inorganic particles such as silica, talc, carbon, zeolite, calcium carbonate, magnesium carbonate, titanium oxide to vinyl chloride resin and forming the film, fine irregularities of inorganic particles are formed on the film surface. Although there is a method of reducing the stickiness on the film surface, the transparency and translucency of the film itself deteriorates, which is not preferable in terms of plant growth.

  In addition, agricultural vinyl films have appeared that are made with satin finish on at least one of the ventilation parts of the film (the film winding and unwinding parts), and acrylic resin is applied to one or both sides of the film to provide dust resistance. (Patent Document 2). This film prevents the stickiness of the film at the winding and unwinding parts of the film by applying a satin finish, and makes the remaining film a smooth part, giving the film itself a dustproof property and preventing deterioration of transparency. It is what. However, in such a film, the processing of the film is complicated, and it is necessary to use a ventilation portion and a general-purpose film portion separately, which deteriorates workability and the like.

Furthermore, a technique for applying an anti-sticking solution comprising a mixture of an aqueous dispersion of a colloidal inorganic compound and an aqueous organopolysiloxane emulsion, that is, an aqueous binder solution of a silicon compound, on a film has also been proposed (Patent Document 3). ). This method does not process the film itself, but is excellent in that it prevents stickiness of the film by a simple method of applying a prevention liquid to the film that is ventilated and wound up. However, since the adhesion of the vinyl chloride resin film to the aqueous organopolysiloxane emulsion and colloidal inorganic compound used is poor, the workability is poor during preparation of the prevention liquid and during coating work, and inorganic substances are easily lost. However, there was a problem that the persistence of the stickiness prevention effect was poor.
JP 2002-315446 A JP 2000-4684 A JP 2000-129210 A

  Accordingly, the present invention solves the above-mentioned problems, and the conventional vinyl chloride resin film for agricultural use, which has been widely used, can be extended to a vinyl house or the like without special processing at the time of film formation. After that, the film is rolled up and down for ventilation, and only applied to the film surface to prevent the film from sticking to each other without lowering the transparency of the film. It is an object of the present invention to provide an anti-sticking solution for agricultural vinyl chloride resin films that is excellent in workability and excellent in sustainability.

  In order to solve such problems, the present inventors have intensively studied. As a result, when an aqueous binder liquid of an amide compound is used instead of an aqueous binder liquid of a silicon compound that has been conventionally used, a vinyl chloride resin is used. It has been found that the adhesiveness to the film is good and the persistence of the anti-sticking effect by the colloidal inorganic compound to be contained is extremely good, and the present invention has been completed.

Therefore, the present invention is an embodiment thereof;
(1) It consists of an amide compound aqueous dispersion and an inorganic particle aqueous dispersion, and the concentration after dilution is 0.0001 to 0.02% for an amide compound and 0.06 to 0.40 for inorganic particles. % Anti-sticking solution for agricultural vinyl chloride resin films characterized by
(2) The above 1 characterized in that the amide compound aqueous dispersion and the inorganic particle aqueous dispersion are mixed so that the solid content ratio is 0.1: 99.9 to 4.5 to 95.5. Anti-sticking solution for agricultural vinyl chloride resin film as described in 1);
(3) The anti-sticking solution for agricultural vinyl chloride resin films as described in 1 or 2 above, wherein the inorganic particle aqueous dispersion is colloidal silica;
It is.

The anti-sticking solution for agricultural vinyl chloride resin film provided by the present invention does not require the film itself to be processed as a special film, and mixes an inorganic particle aqueous dispersion and an amide compound aqueous dispersion for ventilation. By applying (spraying) the film portion, it is possible to efficiently prevent the stickiness between the films, and the workability thereof is extremely good.
In addition, the amide compound aqueous dispersion used together with the inorganic particle aqueous dispersion is an aqueous binder liquid having a very small amount of the amide compound component concentration, so that there is no whitening on the coated surface of the film and the transparency is impaired. No stickiness prevention effect can be exhibited over a long period of time.
Furthermore, by using an aqueous binder solution of an amide compound instead of the conventional aqueous binder solution of a silicon compound, the adhesion to the vinyl chloride resin film is good, and the sticking prevention effect by the colloidal inorganic compound to be contained is maintained. The property is very good.

As described above, the anti-sticking solution of the present invention is an anti-sticking solution for agricultural vinyl chloride resin films comprising an inorganic particle aqueous dispersion and an amide compound aqueous dispersion.
As the inorganic particles of the inorganic particle aqueous dispersion to be used, colloidal substances such as silica, alumina, lithium silicate and the like can be used. Among them, colloidal silica (colloidal silica) is preferably used.

  The amide compound aqueous dispersion used in the present invention is an emulsion solution as an aqueous binder liquid to be mixed with the inorganic particle aqueous dispersion. In the present invention, the wax effect on the film is exhibited particularly by using the amide compound aqueous dispersion as a dispersion for the inorganic particle aqueous dispersion. Therefore, the anti-sticking effect is sustained by continuously holding the inorganic particles applied to the film surface on the film surface.

  Furthermore, this amide-based compound aqueous dispersion also exhibits properties as a lubricant, and therefore, the effect of smoothing up and down the agricultural vinyl chloride resin film can be improved. be able to.

  Amide compounds used as aqueous binder liquids Amide compounds contained in aqueous dispersions include amides of higher fatty acids such as stearamide, methylenebisstearamide, ethylenebisstearamide, and bisamide compounds. Of these, ethylene bisstearamide and stearamide can be preferably used.

  The anti-sticking solution of the present invention comprises a mixed solution of the above-described inorganic particle aqueous dispersion and amide compound aqueous dispersion. Such a mixed solution is used by diluting with water and applying it to an agricultural vinyl chloride resin film. The concentration of the amide compound and the inorganic particles contained in the mixed solution is 0.0001 to 0.02% in the case of the amide compound after dilution, and 0.06 in the case of the inorganic particles. It is good to prepare so that it may become -0.40%.

  Therefore, in the anti-sticking solution provided by the present invention, the amide compound aqueous dispersion and the inorganic particle aqueous dispersion have a solid content ratio of 0.1: 99.9 to 4.5: 95.5. It is good to mix so that it becomes.

As described above, one feature of the present invention is that the concentration of the amide compound contained in the anti-sticking solution is extremely low. When a large amount of the amide compound is used, the film surface is whitened by the amide compound and the transparency is impaired. On the other hand, if the amount is too small, there is no effect as a binder, and the inorganic particles cannot be held in front of the film.
Therefore, in the present invention, this low concentration can prevent whitening on the film-coated surface, and can exhibit a good anti-sticking effect over a long period of time without impairing transparency.

  As a method for preparing the inorganic particle aqueous dispersion, the inorganic particles may be directly mixed and dispersed in the amide compound aqueous dispersion, or the inorganic particles may be previously dispersed in the amide compound aqueous dispersion in excess of the necessary amount. It is also possible to prepare the product by adding it to the aqueous binder resin solution and adjusting the components.

  The anti-sticking solution of the present invention may contain a surfactant in order to further improve the uniform dispersibility in water. Examples of such surfactants include various surfactants, and among these, nonionic surfactants are preferably used.

As an agricultural vinyl chloride resin film to which the anti-sticking solution provided by the present invention is applied, the composition is mainly composed of a vinyl chloride resin, a plasticizer and a stabilizer, and if necessary, fog prevention such as a fluorine compound. Various additives such as anti-fogging agents such as additives, nonionic surfactants, UV absorbers, antioxidants, processing aids, lubricants, antistatic agents, inorganic fillers, fungicides, algaeproofing agents, coloring agents, etc. An agent may be added.
There are no particular restrictions on the type and amount of additives that can be added to conventional agricultural vinyl chloride resin films in the usual amounts.

  In addition, as a vinyl chloride resin, if it is normally used for a vinyl chloride resin film, it can be used. Specifically, polyvinyl chloride resin or vinyl chloride and other monomers such as vinylidene chloride, acrylonitrile, maleic acid, itaconic acid, methacrylic acid, vinyl acetate, ethylene, propylene, maleate, methyl methacrylate, methacrylic acid Examples thereof include copolymers with acid esters, acrylic acid esters, higher vinyl ethers, and the like, or blends thereof.

  The anti-sticking solution of the present invention is diluted with water and applied (sprayed) to the surface of these agricultural vinyl chloride resin films, but the amount applied is not limited in general depending on the dilution ratio with water. What is necessary is just to apply | coat the quantity from which a desired stickiness prevention effect is acquired.

  EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples below, but the present invention is not limited to these examples.

Examples 1-4 / Comparative Examples 1-5:
The anti-sticking solution of the present invention and the anti-sticking solution of the comparative example were obtained according to the formulation shown in Table 1 below, diluted with water, applied to a general agricultural vinyl chloride resin film in a total amount of 5,000 mL, and the stickiness thereof. The prevention effect and transparency were confirmed.
As the anti-sticking effect, the unwinding test described later, the persistence of application of the anti-sticking solution on the film, and the change in the appearance of the film were evaluated, and the results are also shown in the table.

Notes in the table are as follows.
* 1: Amide compound aqueous dispersion: SA-20 (manufactured by Nippon Kasei Co., Ltd.); solid content ratio 20%
* 2: Silicon compound aqueous dispersion: SH-7024 (manufactured by Toray Dow Corning); solid content ratio 35%
* 3: Colloidal silica aqueous dispersion: Snowtex 20 (manufactured by Nissan Chemical Co., Ltd.); solid content ratio 20%; particle size 20 nm

* 4: The test method and evaluation method for the anti-sticking effect are as follows.
A house having a length of 16 m, a height of 0.6 m, and a frontage of 1 m was produced, a general agricultural vinyl chloride resin film was stretched, and the roof portion film was cut off. A 10 cm × 30 cm square film sprayed with the anti-sticking solution prepared in Examples 1 to 4 and Comparative Examples 1 to 5 was attached with the coated surface facing the inside of the house (5 samples each). After each period, each was used as a measurement sample (test period: November 15, 2004 to December 13, 2004).

(1) Unwinding and persistence of effect The film of the measurement sample obtained above is wound around an iron pipe having a diameter of 1.9 cm / length: 14 cm, left at 70 ° C. for 7 hours, and then a plate having an inclination of 60 degrees. The time was measured until it dropped by its own weight.
(2) Evaluation is as follows.
◎: Within 3 minutes ○: 3-4 minutes △: 4-5 minutes ×: More than 5 minutes

* 5: The appearance of the film was measured visually for the transparency of the measurement sample film.
The evaluation was based on the following criteria.
(Transparency is not a problem)

As can be seen from the results of the above Examples and Comparative Examples, it was understood that the anti-sticking solution of the present invention showed good results.
In particular, Comparative Examples 4 and 5 are non-sticking solutions using a silicon compound aqueous dispersion as an aqueous binder solution disclosed in Patent Document 3, whereas the stickiness-preventing effect is poorly sustained. The stickiness-preventing liquid of the present invention was found to be extremely good in sustainability of the effect even when the aqueous binder liquid had a low concentration by using an amide compound aqueous dispersion.

As described above, the present invention prevents stickiness between resin films when the resin film is rolled up or down for expansion work or ventilation, without harming the transparency of the film. An anti-sticking solution comprising an amide compound aqueous dispersion and an inorganic particle aqueous dispersion. The anti-sticking liquid of the present invention does not require processing of the film itself as a special film, and can be applied to (spray) the part to be ventilated to effectively prevent sticking between films. It also has excellent sustainability.
Therefore, the workability is very good, the film can be rolled up and lowered for ventilation and ventilation, and the work can be easily reduced. Is.

Claims (3)

  It consists of an amide compound aqueous dispersion and an inorganic particle aqueous dispersion, and the concentration after dilution is 0.0001 to 0.02% for the amide compound and 0.06 to 0.40% for the inorganic particles. An anti-sticking solution for agricultural vinyl chloride resin films.   The amide compound aqueous dispersion and the inorganic particle aqueous dispersion are mixed so that the solid content ratio is 0.1: 99.9 to 4.5 to 95.5. Anti-sticking solution for agricultural PVC film. The anti-sticking solution for agricultural vinyl chloride resin films according to claim 1 or 2, wherein the aqueous dispersion of inorganic particles is colloidal silica.