JPS6239237A - Dust-proof vinyl chloride resin film - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a dust-proof vinyl chloride resin film (hereinafter abbreviated as dust-proof vinyl chloride film), and more specifically, the present invention relates to a dust-proof vinyl chloride resin film (hereinafter abbreviated as dust-proof vinyl chloride film). When ventilating to prevent temperature rise.

This invention relates to a dust-proof PVC film in which the overlapping films do not cause blocking due to temperature rise.

[Conventional technology]

The dust-proof PVC film has an acrylic resin composition film on the surface of the soft PVC resin film, which reduces the adhesion of dust when expanded outdoors and maintains transparency and anti-fog properties for a long period of time, making it even more durable. Demand for agricultural use has increased rapidly in recent years.

However, in greenhouses for greenhouse horticulture, in recent years, during high temperatures during the day, a film stretched around the greenhouse is used as a ventilation section by winding up a pipe around the winter part or side of the greenhouse, and during rainy or cold nights. A simple ventilation method in which the film is rolled up and then rewound to seal the cage has become commonplace.

If a dust-proof PVC film is used in a ventilation method where the films overlap in this way, the film tends to cause blocking and make it difficult to unwind the film (particularly when the temperature is high in the summer, the pipes (mostly made of iron) are heated to 70°C. Temperatures have risen to near (2000), and if the winding contains condensed water or water from rain, the blocking becomes even more severe and it becomes difficult to unwind, creating a problem.

As a countermeasure against blocking of such films, there is a method of sandwiching a nonwoven fabric between the films and rolling them up to avoid pronking, but this method has the disadvantage that the amount of light transmitted when the house is sealed is reduced and the cost increases.

Therefore, there is a method of adding an antiblocking agent to the soft vinyl chloride resin film that is the base material.

In addition, attempts have been made to change the composition ratio of acrylic monomers in the acrylic resin composition or introduce crosslinking monomers, but no significant improvement in pronking has been observed.

Attempts have been made to incorporate a specific fluorine-based surfactant to prevent blocking of soft vinyl chloride resin films (Japanese Patent Laid-Open No. 80468/1983).

Although this method is good for soft PVC resin films, it still has the problem that it does not have sufficient performance as a base material for dustproof PVC films, and it also requires a large amount of addition. .

[Problem that the invention seeks to solve]

An object of the present invention is to provide a dustproof PVC film that solves the above problems and prevents blocking.

[Failure to solve the problem]

As a result of intensive studies to achieve the above object, the present inventors found that the anti-blocking effect was improved by using an acrylic resin composition to which a fluorine surfactant was added.1 The present invention has now been completed.

That is, 1 the present invention provides a dust-proof PVC film comprising a base soft vinyl chloride resin layer and an acrylic resin composition layer, in which the acrylic resin composition has at least 100% of the acrylic resin.
This is a dustproof vinyl chloride film having anti-blocking ability, characterized by comprising parts by weight of the present invention and 0.02 to 5 parts by weight of a fluorine-based surfactant.

As the soft vinyl chloride resin and acrylic resin constituting the present invention, known ones that are used for manufacturing ordinary dustproof vinyl chloride films can be used.

That is, the soft vinyl chloride resin used in the present invention is:
It is obtained by blending plasticizers, stabilizers, metal soap ultraviolet absorbers, antioxidants, etc. with vinyl chloride resin and forming it into a film, but in addition to the above additives, lubricants, pigments, or surfactants etc. may also be included. Further, a fluorine-based surfactant, which will be described later and is used in combination with the acrylic resin, may be included.

The acrylic resin in the present invention is a polymer obtained by polymerizing mainly acrylates and methacrylates, and when providing the acrylic resin composition on the soft vinyl chloride resin layer, it is used as a solution or dispersion. It will be done. This solution or dispersion may be either an aqueous dispersion or an organic solvent solution, and more preferably an aqueous dispersion that is unlikely to dissolve the plasticizer or vinyl chloride resin.

In order to achieve the object of the present invention, it is necessary that a fluorine-based surfactant be added to the above-mentioned acrylic resin composition.

Commercially available fluorine-based surfactants are used.

in particular.

1) CnF2n+10ONH100NH(C2I-(4
0)~12. Preferably 6-10 m=1-30. Preferably 2-20 For example, C, F, C0NH(C2H40)3 HR is a hydrogen atom or a lower alkyl group n=5-12. Preferably 9 m=2-30. Preferably 3-20 eg it ) Cn F2. +1SO2N(CzHs)
(C2I(40)mHn=5-12. Preferably 6-1
0 m=1~30. Preferably 2-20 For example, CaF+tSO2N(C2)(,)(C2H40),
.
No. 4) can be exemplified.

The amount of the fluorine-based surfactant added is 0.02 to 5 parts by weight, preferably 0.1 to 2 parts by weight, per 100 parts by weight of the acrylic resin.

If the amount of the fluorine-based surfactant added is less than 0.02 parts by weight, the desired effect of suppressing blocking will be small, and it will be difficult to obtain a uniform coating surface when coating a vinyl chloride resin film with an acrylic resin. If the amount of the fluorine-containing surfactant added is more than 5 parts by weight, no significant improvement is observed in the blocking reduction effect, which is not economical.

It is an essential condition that the acrylic resin composition in the present invention contains the above-mentioned fluorine-based surfactant.

If necessary, a film forming aid, a surfactant, an ultraviolet absorber, an antioxidant, a coloring agent, a stabilizer, etc. are added to prepare a coating solution with a desired concentration.

To apply the acrylic resin coating liquid onto the vinyl chloride resin layer, a conventionally known coater can be used as is without any special equipment. That is, the head of the coater is a roll coater.

knife coater, rod coater, spray coater,
Any gravure coater, kiss coater, etc. can be used.

There are various drying devices such as a flash drying method, a heat transfer drying method, an infrared heating method, etc., and one suitable for the coating liquid of the acrylic resin composition is selected. In addition, when using a coating liquid using an organic solvent, it is necessary to take various measures against the organic solvent. The drying temperature varies depending on conditions such as the acrylic resin, the solvent used, and the thickness of the coating film, but an aqueous dispersion is used.

If the temperature is higher than the temperature at which the coating film is formed, preferably 100
℃ or higher. The thickness of the acrylic resin coating after drying is preferably 0.1 to 20 μm, preferably 0.3 to 10 μm.

It is determined as appropriate, taking into consideration weather resistance, dust resistance, etc.

〔Example〕

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

Reference Example 1 Creation of soft vinyl chloride resin film A vinyl chloride resin composition having the basic composition shown in Table 1 was mixed for 10 minutes in a Henschel mixer, then kneaded with rolls at 165°C, and then kneaded with an L-type calender to a thickness of 0. .075m
I got a film of.

This film will be referred to as film 1.

Table-1 Basic formulation *1: Methylene bisstearamide *2: Ciba-Geigy 9 Tinuvin P" (m) Reference example 2 The fluorine-based surfactant "Surflon S" was added to the basic formulation of Table-1.
-381'' (trademark manufactured by Asahi Glass Co., Ltd.) in an amount of 0.3 parts by weight, and a film was formed in the same manner as in Reference Example 1.

This film will be referred to as film 2.

Examples 1-7. Comparative Examples 1 to 2 An acrylic resin composition having the formulation shown in Table 2 was coated on one side of the film 10 obtained in Reference Example 1 to a thickness of 5.0 μm.
It was coated using a rod coater method so that the dust-proof PVC film was formed by drying for 50 seconds in an open air at 130°C.

The blocking properties, weather resistance, and coating properties (uniformity of the coating film) of the obtained film were evaluated.

The results are shown in Table-2. ' The acrylic resin mixture was manufactured as follows.

59 parts by weight of methyl methacrylate, 33 parts by weight of n-butyl methacrylate, 6 parts by weight of hydroxyethyl methacrylate
A mixture of 1 part by weight and 2 parts by weight of methacrylic acid was added to 12 parts by weight of water.
0.5 parts by weight of potassium persulfate and 1.0 parts by weight of polyethylene oxide alkyl phenyl ether derivative in 5 parts by weight
While stirring a solution of 3 parts by weight at 70°C,
The resin was added dropwise over a period of time and reacted for an additional 3 hours to achieve a resin concentration of approximately 4.
A 5% by weight aqueous dispersion was obtained.

This was adjusted to PI (7.0) with aqueous ammonia.

Next, 1 part by weight of trimethylolpropane polyglycidyl ether, 5 parts by weight of butylnarbitol and 3 parts by weight of alkylphenyl ether were added to 100 parts by weight of this aqueous dispersion, and the resin concentration was adjusted to 20% by weight with water. As a result, an acrylic resin compounded liquid was obtained.

A predetermined amount of fluorine-based surfactant was added to this to prepare a coating liquid.

The evaluation methods for blocking properties, weather resistance, and coating properties are as follows.

(,1) Blocking properties Films prepared using the following sample preparation methods, Method A, Method B, and Method C were tested using a tensile tester "UTM-111" manufactured by Toyo Baldwin Co., Ltd.
-500'', and was measured by stress when peeling at a speed of 300 m/min at 20° C. in an atmosphere of 50% relative humidity.

Method A: Cut a sample film into a 5x20C11 size, immerse it in water for 5 minutes, take it out, overlap the two films (however, in the case of an acrylic resin coated film, the acrylic resin and vinyl chloride resin layers are overlapped).Load Q ,1
kg/cd and left standing in an atmosphere of 70° C. and 10% relative humidity for 20 hours to obtain a test film.

Method B: Two sample films of 5 x 20 cm are stacked with an acrylic resin layer and a vinyl chloride resin layer, and a load of 0.1 k is applied.
A test film was prepared by leaving the film still under an atmosphere of 60° C. and 95% relative humidity for 17 hours while applying g/d.

Method C: A test film was prepared in the same manner as Method B except that the relative humidity was 10%.

(It) Weather resistance: The test film was placed on a window frame-shaped exposure test stand facing south and tilted at 15 degrees (installation location 1, Nagoya City), and the appearance of the film was visually judged after 24 months. Note that the acrylic resin coated side was placed as the top surface.

◎: No change, O: Slight brown spots, Δ: Brown spots observed. ×: browning on the entire surface (4) Coating property determined by second visual inspection ◎: good, O: fair, △: uneven coating, ×: uneven coating Examples 8 to 9. Comparative Example 3 Dust-proof PVC films were produced in the same manner as in Example 3.5 and Comparative Example 1, respectively, except that Film 2 produced in Reference Example 2 was used.

The results are shown in Table-2.

〔Effect of the invention〕

As is clear from the above examples, the film of the present invention has good blocking properties when a fluorine surfactant is added to the acrylic resin composition.

The effect is observed when the amount added is 0.02 parts by weight or more.

If the amount added is small, that is, less than 0.02 part by weight, no blocking improvement effect will be observed.

Moreover, the coating properties deteriorate, and the weather resistance also deteriorates accordingly.

On the other hand, in the dust-proof PVC film obtained by coating a base vinyl chloride resin film with a fluorine-based surfactant added and an acrylic resin composition that does not contain a fluorine-based surfactant, No blocking-reducing effect was observed in the dustproof PVC film obtained by adding a fluorine-based surfactant to the resin composition.

The dustproof PVC film according to the present invention has the following effects and greatly contributes to greenhouse horticulture.

■Excellent for opening and closing work under house or tunnel cover.

Labor saving becomes possible.

■It is economical as it has improved weather resistance and can be used for a long time.

(2) It is more economical than the conventional method of adding a fluorine-based surfactant to the base vinyl chloride resin film because the anti-blocking effect is achieved with an amount of about 172°.

Claims (1)

[Claims] 1. In a dust-proof vinyl chloride resin film consisting of a base soft vinyl chloride resin layer and an acrylic resin composition layer, the acrylic resin composition contains at least 100% of the acrylic resin.
1. A dust-proof vinyl chloride resin film having anti-blocking ability, characterized by comprising parts by weight of a fluorine-based surfactant and 0.02 to 5 parts by weight of a fluorine-based surfactant.