JPS60147445A - Manufacture of dustproof vinyl chloride resin film - Google Patents

Abstract

PURPOSE:To obtain the titled film free from repellency in the acrylic resin coating, whitening, static electricity generation in its rewinding and tackiness after spreading said resin, by coating the acrylic resin on a flexible vinyl chloride film incorporated with a compound derived from adding oxides to higher fatty acid sorbitan ester. CONSTITUTION:The objective film can be obtained by coating (A) an acrylic resin on the surface of (B) a flexible vinyl chloride resin film incorporated with (i) a compound prepared by adding a) 1-5(pref. 1-3)mol of ethylene oxide plus b) 0.1-3(pref. 0.5-2)mol of propylene oxide to (ii) 1mol of a higher fatty acid sorbitan ester. The amount of said compound to be incorporated is pref. 0.1-4 (pref. 0.5-3)pts.wt. per 100pts.wt. of the acrylic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a dustproof vinyl chloride resin film (hereinafter abbreviated as dustproof vinyl chloride). More specifically, the present invention relates to an extremely excellent method for producing dust-proof PVC that exhibits good coating properties when applying an acrylic resin, and that does not generate static electricity when unrolling a roll or cause stickiness after being rolled out.

Dust-proof PVC has an acrylic resin film on its surface, so it stays free of dust, has excellent transparency, has long-lasting droplet performance, and is highly durable. Because of these characteristics, the demand for agricultural use has increased rapidly in recent years.

However, when manufacturing dust-proof PVC, an acrylic resin is applied and dried, but there are problems with the coating liquid being repelled and whitening during drying, resulting in poor transparency. , which has the disadvantage of extremely low productivity.

In addition, when conventional dust-proof PVC is unwrapped from a roll, it is easy to generate static electricity due to the acrylic resin coating on its surface, and the level of static electricity is far greater than that of the original film before coating. It has the disadvantage of being large and subjecting workers to electrostatic shock and shock when bonding with a sewing machine.

Furthermore, in recent years, with conventional dust-proof PVC, the film has been stored on top of a pipe by being rolled up around a shaft, but when it is rewound several months later, the film tends to fuse. , there is also a drawback that sticky defects occur.

The inventors of the present invention made extensive studies to improve the above-mentioned drawbacks of dust-proof PVC, and as a result, developed a base material of soft vinyl chloride.

It has been discovered that by adding a specific compound to the resin film, the above-mentioned drawbacks can be solved and dust-proof PVC can be obtained, and the present invention has been completed.

□That is, the present invention provides a method for producing a dust-proof vinyl chloride resin film by coating the surface of a soft vinyl chloride resin film with an acrylic resin, in which 1 mole of sorbitan fatty acid ester is used as a base material of the soft vinyl chloride resin film. In contrast, a soft salt containing a compound to which 1 to 5 moles of ethylene oxide and 1 to 3 moles of propylene oxide are added: A dustproof method using a polyvinyl chloride resin film. Sex.

This is a method for producing vinyl chloride resin film.・□By the method of the present invention, the above-mentioned drawbacks are completely eliminated and good dust-proof PVC can be obtained.

The soft vinyl chloride resin film and surface treatment agent constituting the present invention are known ones used for producing ordinary dustproof vinyl chloride, except for the addition of specific compounds referred to in the present invention.

That is, the soft vinyl chloride resin film used in the present invention is a homopolymer or copolymer of vinyl chloride, and this vinyl chloride resin is blended with a plasticizer, a stabilizer, a metal soap, an ultraviolet absorber, an antioxidant, etc. The film may be obtained by preparing a film, and may further contain a lubricant, a pigment, or a surfactant.

Furthermore, in the invention ↑, it is necessary to add the specific compounds shown below in order to achieve the object of the invention.

Tree climbing! These specific compounds include sorbitol and
Alternatively, it is a seven diester, diester, triester, etc. of sorbitan and higher fatty acid, or a mixture thereof, to which specific amounts of ethylene oxide and propylene oxide are added. r Higher fatty acids that form esters with sorbitol and/or sorbitan generally have 12 carbon atoms.
~22 saturated or unsaturated fatty acids, and specific examples include lauric acid, myristic acid, palmitic acid, leicic acid, stearic acid, and behenic acid. However, it is not necessarily limited to these □. `` □'□ ``Specific chemical substances included in the present invention are ``higher fatty acids with divalent sorbitol and/or ``matsuru □ bitane.''
Eyute 7. □、7. Hit, Echire, Oyagaide is 1~
5 mol, preferably 1 to 3 mol, and 0.1 to 3 mol, preferably 0.5 to 2 mol, of propylene oxygenate 1 are added.

It is necessary that the number of moles added falls within the above range; if the number of moles added falls outside the range of I can't do it.

Soft vinyl chloride resin film of this particular compound
廝□、The amount of polyvinyl chloride resin to be added is 100 weight Ji.

If the amount is less than this range, the effect of addition will not be sufficiently obtained, and if it is added more than this range, the effect will hardly change, but instead it will bleed, resulting in a sticky surface and impairing dustproof properties.

The present compound is blended at the same time as the components of the soft vinyl chloride resin film shown above, and is thoroughly mixed with a blender such as a blender or a Henschel mixer.
It is made into a film by a known film forming method, such as a calendar method, an inkjet method, or a T-die method.

In the present invention, the surface treatment agent used to impart dustproof properties may be a solvent solution or an aqueous emulsion of an acrylic resin, or an acrylic resin containing mainly methyl methacrylate, butyl methacrylate, etc. It may be composed of a copolymer, in which a monomer having a functional group having a crosslinking agent is copolymerized, or it may be a crosslinkable additive.

To apply the surface treatment agent, add film-forming agent, surfactant, etc. as necessary to the above-mentioned solution to make a mixed coating solution, and use a coater to coat the soft vinyl chloride resin film that is the base material. This is done so that the solid content on the surface becomes approximately 1 to 5 μm thick.

It is then dried to obtain dustproof PVC.

In the method of the present invention, there is no phenomenon of the coating liquid being repelled during the surface treatment process or whitening due to drying, dust-proof PVC having good transparency can be obtained, and the productivity is also extremely good.

In addition, the dust-proof PVC obtained by the method of the present invention not only has excellent transparency as described above, but also has good dust-proof properties. There was no fusion phenomenon that had occurred,
In addition, the electrostatic property is extremely low, and it can be particularly effectively used as an agricultural coating material.

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

Examples 1 to 7 and Comparative Examples 1 to 7 Vinyl chloride resin (manufactured by Mitsui Toatsu Chemical Co., Ltd., Pinikron 4000M (trademark)) 100 parts by weight, 45 parts by weight of phthalate dioctyl, 5 parts by weight of tricresyl phosphate Part, epoxy resin (manufactured by Shisei Kagaku Co., Ltd., Ebiko) 82
8 (trademark) ), 1 part each of zinc stearate and barium stearate, and 2.0 parts by weight of the compound shown in Table 1 were added and mixed uniformly using a Henschel mixer, and then 1. After kneading for 10 minutes with an open mill roll set at 80°C,
A film with a thickness of (1,10111 mm) was prepared using an inch Z-type calender.

On the other hand, 0.5 parts by weight of potassium persulfate and 1.0 parts by weight of a polyoxyethylene oxide alkylphenol ether derivative were dissolved in 125 parts by weight of water, and the solution was charged into a reactor and heated to 70°C. In this, 59 parts by weight of methyl methacrylate, 33 parts by weight of n-butyl methacrylate,
A mixture of 6 parts by weight of hydroxyethyl methacrylate and 2 parts by weight of methacrylic acid was added dropwise over 3 hours to cause emulsion polymerization, and after completion of the addition, the reaction was continued for another 3 hours to obtain an aqueous dispersion with a resin concentration of 45%. This aqueous dispersion was neutralized to pH 7.0 with aqueous ammonia.

To 100 parts by weight of this neutralized aqueous dispersion, 5 parts by weight of butylcarpitol and 3 parts by weight of alkylphenol ether were added as film-forming aids, and after returning home, the resin was diluted with water to a concentration of 20% and applied. I got the liquid.

This coating solution was applied to one side of the above-mentioned soft vinyl chloride resin film using a rod coater so that the thickness of the coating film after drying was 2.
．． It was coated to a thickness of 0μ, and then dried in an open air at 130°C for 30 seconds to obtain dustproof PVC.

These films were evaluated as follows. The results are shown in Table 1.

■Applicability The degree of whitening observed was determined visually.

These evaluations are based on the following.

O: Good with no repellency (whitening) observed.

△: 7 repellents (whitening) are applied to some parts.

×: Repellency (whitening) was observed over the entire surface, and the degree of repellency was extremely poor.

■Generation of Static Electricity The roll of coated film was unwound at a speed of 10 m/min, and the amount of static electricity generated at that time was measured using a static voltmeter (manufactured by Kasuga Denki).

■After stretching, the film treated with the sticky coating was cut into a 30 cIrL width, wrapped around a 2.54 cIrL diameter iron pipe with both sides sufficiently wet with water, and then left outdoors for about a month. was measured.

The higher the intensity, the higher the stickiness.

Claims (1)

[Claims] 1) In the method of manufacturing a dust-proof vinyl resin film by coating the surface of a soft vinyl chloride resin film with an acrylic resin, ethylene oxide is added per mole of sorbitan higher fatty acid ester as the base material soft vinyl chloride resin film. 1 to 5 mol and 0.0 mol of propylene oxide.
A method for producing a dust-proof vinyl chloride resin film, characterized in that a soft vinyl chloride resin film containing a compound added thereto in an amount of 1 to 3 moles is used.