JPH0113729B2 - - Google Patents

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 dustproof PVC that exhibits good coating properties when applying an acrylic resin, does not generate static electricity when the roll is unrolled, and does not become sticky after being rolled out. Dust-proof PVC has features such as being coated with an acrylic resin film on its surface, which means that dust will never stick to it, excellent transparency, long-lasting droplet performance, and excellent durability. Therefore, demand for agricultural use has increased rapidly in recent years. However, when manufacturing dust-proof PVC, acrylic resin is applied and dried.
At that time, there are problems such as the coating liquid being repelled and whitening during drying, which tends to cause poor transparency, and has the disadvantage of extremely poor productivity. In addition, when conventional dustproof 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 giving an electrostatic shock to the worker during the sewing machine bonding process. Furthermore, in recent years, with conventional dust-proof PVC, the film has been stored in the summer by being rolled up on a pipe on the shaft, but when it is unwound several months later, the film fuses and becomes sticky. It also has the disadvantage that it occurs. As a result of intensive studies to improve the above-mentioned drawbacks of dust-proof PVC, the present inventors found that the above-mentioned drawbacks were solved by adding a specific compound to the soft vinyl chloride resin film that is the base material, and the dust-proof PVC was improved. The present inventors have discovered that the following can be obtained, and have completed the present invention. 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. 1 to 5 moles of ethylene oxide and 0.1 to 3 moles of propylene oxide
This is a method for producing a dust-proof vinyl chloride resin film, which is characterized by using a soft vinyl chloride resin film containing a compound to which moles have been added. By the method of the present invention, the above-mentioned drawbacks are completely eliminated and a 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 in the production of ordinary dust-proof PVC, except for the addition of the specific compound referred to in the present invention. That is, in the soft vinyl chloride resin film used in the present invention, the vinyl chloride resin is a vinyl chloride homopolymer or copolymer, and the vinyl chloride resin is mixed with a plasticizer, a stabilizer, a metal soap, an ultraviolet absorber,
It is obtained by blending an antioxidant and the like into a film, and may further contain a lubricant, pigment, or surfactant. Furthermore, in the present invention, it is necessary to add the specific compounds shown below in order to achieve the object of the present invention. The specific compounds referred to in the present invention are monoesters, diesters, triesters, etc. of sorbitol and/or sorbitan with higher fatty acids, or mixtures thereof, to which specific amounts of ethylene oxide and propylene oxide are added, respectively. Higher fatty acids that form esters with sorbitol and/or sorbitan are generally saturated or unsaturated fatty acids having 12 to 22 carbon atoms, and specific examples include lauric acid, myristic acid, and palmitic acid. Preferred examples include oleic acid, stearic acid, behenic acid, etc., but are not necessarily limited to these. The specific compound used in the present invention contains 1 to 1 ethylene oxide per mole of the above-mentioned higher fatty acid ester with sorbitol and/or sorbitan.
5 moles, preferably 1 to 3 moles, and 0.1 to 3 moles, preferably 0.5 to 2 moles of propylene oxide added thereto. It is necessary that the number of added moles of ethylene oxide and propylene oxide is within the above range,
If it is outside this range, the above three effects are not necessarily sufficient, and good dust-proof PVC cannot be obtained. The appropriate amount of this specific compound to be added to the soft vinyl chloride resin film is 0.1 to 4 parts by weight, preferably 0.5 to 3 parts by weight, per 100 parts by weight of the vinyl chloride resin, and if it is less than this range, the effect of addition is poor. If the amount is increased beyond this range, the effect will hardly change, and the surface will become sticky due to bleeding, which will impair the dustproof properties. The compound of the present invention can be blended at the same time as the constituent components of the soft vinyl chloride resin film shown above. It is made into a film by a method such as a method, an inflation method, or a T-die method. The surface treatment agent used to impart dustproof properties in the present invention is a solvent solution or aqueous emulsion of an acrylic resin, and is mainly composed of an acrylic copolymer mainly composed of monomers such as methyl methacrylate and butyl methacrylate. , a monomer having a crosslinkable functional group may be copolymerized, or a crosslinking agent may be added. To apply the surface treatment agent, add a film-forming agent, a surfactant, etc. as necessary to the above-mentioned solution to form a mixed coating solution, and use a coater to coat the surface of the soft vinyl chloride resin film as a base material with solid particles. Approximately 1~
Do this so that the thickness is approximately 5 μm. It is then dried to obtain dustproof PVC. The method of the present invention does not cause the coating liquid to be repelled during the surface treatment process or whiten due to drying, and dust-proof PVC with good transparency can be obtained.
Moreover, 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 is no fusion phenomenon that occurs when a hot product is unrolled in the summer, and the electrostatic property is extremely low, so it can be used particularly effectively as an agricultural covering material. The present invention will be explained below with reference to Examples. Examples 1 to 7 and Comparative Examples 1 to 7 100 parts by weight of vinyl chloride resin (manufactured by Mitsui Toatsu Chemical Co., Ltd., Vinicron 4000M (trademark)), 45 parts by weight of dioctyl phthalate, 5 parts by weight of tricresyl phosphate, epoxy resin (manufactured by Ciel Chemical Co., Ltd., Epicoat 828 (trademark)) 2.0 parts by weight, zinc stearate and barium stearate each 1 part by weight, and the compounds shown in Table 1
2.0 parts by weight was added, mixed uniformly using a Henschel mixer, then kneaded for 10 minutes using an open mill roll set at 180°C, and then rolled into a 0.10 mm thick film using a 30-inch Z-type calender set at 180°C. Created. On the other hand, 0.5 parts by weight of potassium persulfate and 1.0 parts by weight of a polyoxyethylene oxide alkyl phenol ether derivative were dissolved in 125 parts by weight of water, and the solution was charged into a reactor and heated to 70°C. A mixture of 59 parts by weight of methyl methacrylate, 33 parts by weight of n-butyl methacrylate, 6 parts by weight of hydroxyethyl methacrylate, and 2 parts by weight of methacrylic acid was added dropwise to this mixture over 3 hours to effect emulsion polymerization, and the reaction was continued for another 3 hours after the addition was completed. An aqueous dispersion with a resin concentration of 45% was obtained. PH this aqueous dispersion with ammonia water.
Neutralized to 7.0. Add 5 parts by weight of butyl carbitol and 3 parts by weight of alkyl phenol ether as film forming aids to 100 parts by weight of this neutralized aqueous dispersion, and finally dilute with water so that the resin concentration is 20% by weight and apply. 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 method so that the thickness of the coating after drying was 2.0 μm, and then
The dust-proof PVC was obtained by drying in an oven at ℃ for 30 seconds. These films were evaluated as follows. The results are shown in Table 1. Coating property The degree of repellency when the coating solution was applied to a soft vinyl chloride resin film and the degree of whitening observed when drying after application were visually judged. These evaluations are based on the following. ○: Good with no repellency (whitening) observed. △: Repellency (whitening) is observed in some parts. ×: Repellency (whitening) was observed over the entire surface, and the degree of repellency was extremely poor. Generation of static electricity A roll of coated film was rewound 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). Stickiness after spreading A coated film was cut into 30 cm widths, both sides thoroughly wetted with water, wrapped around a 2.54 cm diameter iron pipe, and the unwrapping strength was measured after being left outdoors for about a month. did. The higher the intensity, the higher the stickiness.

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Claims (1)

[Claims] 1. In 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, 1 to 1 mol of ethylene oxide is added to 1 mole of sorbitan higher fatty acid ester as the base material, the soft vinyl chloride resin film. 5
A method for producing a dust-proof vinyl chloride resin film, which comprises using a soft vinyl chloride resin film containing a compound to which 0.1 to 3 moles of propylene oxide and 0.1 to 3 moles of propylene oxide are added.