JPH0562571B2 - - Google Patents

Description

[Detailed description of the invention]

"Industrial Application Field" The present invention relates to a method for producing a soft vinyl chloride film with improved adhesiveness and surface appearance. In more detail, conventional anti-adhesive powders are sprinkled on the film surface to improve adhesion, which causes the anti-adhesive powder to sink into the film surface, reduce transparency, create avatar-like shapes, and roll-like objects. The present invention relates to a method for producing a soft vinyl chloride resin film with improved adhesion and surface appearance, with improved wrinkles and edges. ``Prior art'' Soft vinyl chloride resin films, which are made by blending a large amount of plasticizer with vinyl chloride resin, are generally produced continuously by calendar molding or extrusion molding, and the film is wound into a roll. It will be done. Soft vinyl chloride resin film is used for daily miscellaneous goods,
It has a wide range of uses, including packaging for clothing and covering agricultural greenhouses. In general, the rolled material is subjected to so-called secondary processing such as unwinding, cutting, welding, and printing, depending on the intended use. Add plasticizer to 100 parts by weight of vinyl chloride resin.
A soft vinyl chloride resin film made by blending 25 parts by weight or more has a high surface smoothness and good transparency, but the film surface is sticky and the film surfaces do not stick together when rolled. are attached to each other. Rolled films whose surfaces adhere to each other in this way are difficult to unwind during secondary processing, resulting in extremely poor workability and, in some cases, resulting in poor product quality. The surfaces of the products may adhere to each other, resulting in defective products. As a method to eliminate such problems, a soft vinyl chloride resin film is continuously produced by a calendar molding method or an extrusion molding method, and immediately before being wound into a roll, starch,
A method of dispersing anti-adhesion fine powder such as talc has been proposed and put into practical use. "Problems to be Solved by the Invention" Generally, a soft vinyl chloride resin film is manufactured continuously by a calendar molding method or an extrusion molding method, and an anti-adhesion fine powder is sprinkled just before it is wound into a roll. In this method, the film temperature is not sufficiently cooled, so the dispersed anti-adhesive powder such as starch and talc sinks into the film surface, resulting in a satin-like film surface that does not lose its smoothness and deteriorates transparency. There was a trend. In order to solve the above problem, we lowered the temperature of the film during winding. As a result, wrinkles appeared on the wound film, and the rolled film had undulations (unevenness) called wrinkles. )
There was a tendency for this to occur. In addition, if the film is produced continuously using a calendar molding method or an extrusion molding method, and an anti-adhesion fine powder is sprinkled just before winding it into a roll, the surface of the film becomes slippery, so air is drawn in. There was a tendency for the rolled film to become avatar-like, resulting in poor appearance, and for the rolled film to become loose, causing dents to occur when the rolled film was transported or stored. "Means for Solving the Problems" The inventors of the present invention have found that in such a situation, the anti-blocking agent sinks into the film surface and air gets entangled without losing the smoothness and transparency of the surface of the soft vinyl chloride resin film. Soft vinyl chloride that does not cause avatar-like formations, does not cause creases, wrinkles, or wrinkles on rolls, is hard to roll, does not leave dents, and has good adhesiveness and surface appearance. The present invention has been completed as a result of extensive research aimed at providing a method for producing a resin film. Therefore, the gist of the present invention is to form a resin composition containing 100 parts by weight of a vinyl chloride resin and 25 to 100 parts by weight of a plasticizer into a film by a calendar molding method or an extrusion molding method, and then wind it into a roll. , cool and later unwind this roll spool;
The present invention provides a method for producing a soft vinyl chloride resin film with good tack and surface appearance, which comprises scattering anti-adhesion fine powder on at least one side of the film and then winding the film. The present invention will be explained in detail below. In the present invention, the vinyl chloride resin refers to polyvinyl chloride and a copolymer mainly composed of vinyl chloride. Monomers copolymerizable with vinyl chloride include vinyl esters, vinyl ethers, acrylic acid or methacrylic acid and their esters, maleic acid or fumaric acid and their esters, maleic anhydride, aromatic acid vinyl compounds, Vinylidene halide compounds, acrylonitrile, methachronitrile,
Examples include ethylene and propylene. To soften the above vinyl chloride resin, resin
25 to 100 parts by weight of plasticizer is added to 100 parts by weight. Examples of plasticizers that can be used include phthalate esters such as dioctyl phthalate, dibutyl phthalate, butylbenzyl phthalate, dibenzyl phthalate, diisodecyl phthalate, didodecyl phthalate, and diudecyl phthalate; dioctyl adipate, n-butyl adipate, Aliphatic dibasic acid esters such as dibutyl sebacate; glycol esters such as pentaerythritol ester and diethylene glycol benzoate; fatty acid esters such as methyl acetyl ricinoleate; phosphate esters such as tricresyl phosphate and tricylenyl phosphate Class; epoxidized soybean oil,
Epoxy compounds such as epoxidized linseed oil and diglycidyl bisphenol A; citric acid esters such as acetyl tributyl citrate, acetyl trioctyl citrate, tri-n-butyl citrate, trialkyl trimellitate, tetra-n-
Examples include plasticizers with various structures such as octyl pyromellitate, polypropylene adipate, and other polyester-based plasticizers. In addition to the above-mentioned plasticizers, the vinyl chloride resin may contain various usual resin additives as necessary, such as stabilizers, lubricants, antifogging agents, antistatic agents, antioxidants, ultraviolet absorbers, light stabilizers, Dyes, pigments, fillers, flame retardants, etc. can be blended. These resin additives can be selected in the usual amount, for example, within the range of 10 parts by weight or less per 100 parts by weight of the base vinyl chloride resin. To blend the vinyl chloride resin plasticizer and various resin additives, use conventional mixing and blending techniques such as a ribbon blender, Banbury mixer, super mixer, and other conventionally known blenders and mixers. good. In the method of the present invention, the vinyl chloride resin composition containing the plasticizer is formed into a film. To form a film from the vinyl chloride resin composition,
Extrusion molding methods such as T-die method and inflation method,
and calendar molding techniques are adopted. The film is formed into a film having a desired width and a desired thickness in the range of 0.03 mm to 1 mm, and is then wound up into a roll. The winding method may be any conventionally known method;
For example, it is wound up using a center winder, a surf-swinder, etc. to form a roll-shaped product. The winding temperature at this time may be a temperature that does not cause wrinkles, but preferably 20°C to 60°C. If the winding temperature is lower than 20°C, wrinkles tend to occur during winding, which is not preferable. Further, it is not preferable to set the winding temperature higher than 60°C because the film becomes difficult to unwind. In the method of the present invention, each portion of the film wound into a roll is uniformly cooled and solidified, and then unwound, an anti-adhesive fine powder is sprinkled on at least one side of the film, and the film is wound again into a roll. The anti-adhesive fine powder used in the method of the present invention may be any of those conventionally used as anti-adhesive powders, such as starch fine powder obtained from plants such as potatoes, corn, and wheat, talc, tetrasilicon mica, etc. The fine starch powder, talc, and tetrasilicon mica mentioned above are hygroscopic, so if a film with these sprinkled on the surface is stored for a long time, the particles will absorb moisture and coagulate, preventing the films from sticking together. function may deteriorate. In order to prevent or suppress the deterioration of the anti-adhesive function due to changes over time, it is preferable to use fine starch powder whose surface is coated with another substance in advance. Preferred substances for coating the particle surfaces of fine starch powder, talc, and tetrasilicon mica include silicone oil and fluorine compounds. A specific example of silicone oil is a silicone oil with a skeleton of siloxane bonds and a silicon atom containing a methyl group, phenyl group, hydroxyl group, etc.
Examples include dimethylpolysiloxane, diphenylpolysiloxane, methylphenylpolysiloxane, dimethyl-methylphenylpolysiloxane, dimethyl-diphenylpolysiloxane, and methylhydrogenpolysiloxane. Examples of fluorine-based compounds include tetrafluoroethylene resin oligomers,
Examples include fluorine-based compounds containing a perfluoroalkyl group having a functional group such as acrylate or methacrylate at the end. In order to coat the surface of particles such as fine starch powder, talc, tetrasilicon mica, etc. with the above substance, the silicone oil, fluorine-based compound, etc. mentioned above is dispersed or dissolved in a solvent, and the fine starch powder is added and mixed. ,
All you have to do is volatilize the solvent. According to the present invention, the anti-adhesive fine powder such as starch fine powder, talc, tetrasilicon mica, etc. is sprinkled on at least one side of the film surface, and once a vinyl chloride resin film formed by a calender series or an extrusion series is made into a long film. The film is wound into a wide roll, cooled and solidified so that the temperature of each part of the film is uniform, and then the roll-shaped film is rewound and the static electricity on the film surface is removed by a static electricity removal device. The temperature of the film when unwinding the roll-shaped film is determined by the fact that fine anti-adhesive powders such as fine starch powder, talc, and tetrasilicon mica sink into the surface of the film.
The temperature may be any temperature at which the anti-adhesive fine powder does not create dents in the film or adhere to the film, and although it varies depending on the amount of plasticizer contained in the film, it is preferably 10°C to 30°C. If the film temperature is lower than 10° C., the film loses its flexibility and tends to cause problems such as tearing when trimming both ends, which is not preferable. Further, if the film temperature is higher than 30°C, the film surface becomes soft, the anti-tack agent sinks into the film or adheres to the film, the film has a satin-like appearance, and the transparency deteriorates, which is undesirable. Further, the particle size of the fine starch powder, talc, tetrasilicon mica, etc. used in the present invention is preferably in the range of 1 to 30 microns. If the average particle diameter is less than 1 micron, the particles may aggregate and fall onto the film surface in large clumps called droplets, which is undesirable since the film surface may lose its smoothness. Also, if the average particle size is larger than 30 microns,
When the film is wound into a roll, a large amount of air is trapped between the films, making it difficult to form a tight roll, and problems such as dents may occur during transport or storage of the roll, which is undesirable. Spraying anti-blocking agents such as fine starch powder, talc, and tetrasilicon mica onto the film surface uses conventionally known equipment such as an electrostatic duster that uses static electricity to charge particles and a spray machine that uses a rotating drum. It depends on the method used. The amount of spraying on the film surface can be selected depending on the type of plasticizer mixed in the film, the amount of plasticizer mixed, the secondary processing method of the film, etc., and is in the range of 0.01 to 5 grams per square <sup>meter</sup> of film. It is preferable to do so. If the amount of spraying is less than 0.01g/ <sup>m2</sup> , the anti-adhesive effect on the film surface will be reduced,
If the amount is more than m <sup>2</sup> , the film may slip too much, making it impossible to form a sufficiently hard roll, or causing trouble during secondary processing, which is undesirable. "Effects of the Invention" A soft vinyl chloride resin film produced by the calendar molding method or extrusion molding method as described above is wound into a long and wide roll, uniformly cooled and solidified, and then unwound. This film is made by scattering anti-adhesive fine powder on at least one side of the film and rewinding it into a roll. In comparison with a film sprinkled with a fine powder to prevent film adhesion, the following effects are particularly remarkable, and its industrial value is extremely great. (1) The soft vinyl chloride resin film obtained by the present invention has good film smoothness because the anti-adhesion fine powder does not sink into the soft vinyl chloride resin film or stick to the film surface.
Transparency is also extremely good. (2) According to the method of the present invention, the anti-adhesive powder does not sink into the film and does not stick to the film surface, so compared to the conventional method, the anti-adhesive effect is produced by dispersing a small amount of the anti-adhesive powder, so it is economical. It is both practical and hygienic, and can prevent the negative effects of anti-adhesion fine powder on products after secondary processing. (3) According to the present invention, the anti-adhesive fine powder does not sink into the film or stick to the film surface, so even if a special anti-adhesive effect is required and a large amount of anti-adhesive fine powder is sprinkled, the film will remain intact. There is no adverse effect on the surface appearance. (4) According to the present invention, a film with good surface smoothness and transparency can be obtained without causing avatar-like appearance defects due to air being trapped between the rolled films. (5) According to the present invention, the film on which the anti-adhesion fine powder is sprinkled is uniformly cooled and solidified, so compared to the conventional method, the film is less likely to be distorted even when wound with a large tension, and the film is rolled with a hard roll. Since a roll is obtained, dents (dents) that occur during transport and storage of the roll are less likely to occur, and the surface appearance of the film is not impaired. (6) According to the present invention, since each part of the film is uniformly cooled and solidified, it is possible to obtain a film with a good surface appearance and no wrinkles (involvement wrinkles) compared to conventional methods. (7) According to the present invention, since the anti-adhesion fine powder is uniformly dispersed on the surface of the film that has been cooled and solidified and is then wound up into a roll, there is almost no shrinkage of the film after rolling, and the film rolls due to thick and thin parts. There is no formation of edges (unevenness) in the rolled material.
The uniform cylindrical shape of the rolled material is maintained, and the smoothness (lay flatness) when the film is unwound from the rolled material is good. Hereinafter, the present invention will be explained in detail based on Examples and Comparative Examples, but the present invention is not limited to the following examples unless it exceeds the gist thereof. Example 1 Polyvinyl chloride (=1100) 100 parts by weight dioctyl phthalate As shown in Table 1, raw materials and resin additives consisting of barium-zinc composite stabilizer 2 parts by weight epoxidized soybean oil 3 were weighed. After stirring and mixing these in a super mixer for 10 minutes,
The mixture was kneaded on rolls heated to 0.degree. C. and rolled into a transparent soft vinyl chloride film with a width of 1000 mm and a thickness of 0.1 m/m using an inverted L-shaped calender. This film is heated to 45℃ using a cooling device.
After being cooled to a temperature of 1,000 m, it was wound into a roll with a length of 1000 m using a winder. The above roll was left to stand for 24 hours, the film was unwound from the roll at a film temperature of 20°C, and fine starch powder ( 0.1 g of AS-100 (manufactured by Nitsuka Corporation, average particle diameter 15 microns) per 1 square meter of film was applied, and after cutting both ends of the film, it was wound into a roll having a width of 970 mm and a winding length of 100 m. Examples 2 to 17 The type of anti-blocking agent in Example 1, the amount of spraying, the blending amount of plasticizer for the fabric, the temperature for winding the fabric, and the film temperature during spraying of the anti-blocking agent were changed as shown in Table 1. Other than that, 16 types of rolls were manufactured in the same manner as in Example 1. Comparative Examples 1 to 6 The same polyvinyl chloride resin composition as in Example 1 was mixed and kneaded in the same manner as in Example 1, and was heated to a width of 1000 m/m and a thickness of 0.1 using an inverted L calender.
It was rolled into a transparent soft vinyl chloride film of m/m. The film after it comes out of the calendar roll,
The film was brought into contact with a cooling roll to cool the film to the various temperatures shown in Table 1, and various fine powders shown in Table 1 were sprayed at the amounts shown in Table 1. Put this film in a winder
It was wound into a roll 100m long. Rolls of 23 types of soft vinyl chloride resin films produced in Examples and Comparative Examples were heated at a temperature of 25°C and a relative humidity of 90%.
After leaving the film for two weeks in an atmosphere of carried out. The evaluation results shown in Table 1 have the following meanings. "Film tackiness" ○... Almost no tackiness △... Slight tackiness ×... Significant tackiness "Surface smoothness" Observe with the naked eye the surface of the film that was evaluated for tackiness above. did. The evaluation results shown in Table 1 have the following meanings. ○...Surface is extremely smooth △...Slight unevenness is observed on the surface due to powder penetration ×..."Transparency" where considerable unevenness is observed on the surface due to powder penetration and adhesion Film cut from a roll-shaped material was held up to a light source and its transparency was judged visually. The evaluation results shown in Table 1 have the following meanings. ○...Good transparency △...Slightly poor transparency ×...Poor transparency "Avatar generation" The appearance of avatars on the surface of the film cut out from the roll was visually observed. The evaluation results shown in Table 1 have the following meanings. ○...Surface is extremely smooth △...Slight avatar-like appearance is observed on the surface ×...Significant avatar-like appearance is observed on the surface ``Wrinkle generation'' When the rolled material is rewound, wrinkles appear on the film surface. The presence or absence of was visually observed. ○...No wrinkles are observed △...Some wrinkles are observed ×...Severe wrinkles are observed "Furrying" Visually observe from the top of the roll to check the uniformity of the color. The occurrence or non-occurrence of snails was evaluated. The evaluation results shown in Table 1 have the following meanings. ○...The gloss and color tone of the surface are uniform, and there are no spots observed.△...There are some areas where the surface looks black and some areas where it looks white.×...There are some areas where the surface looks black and white. "Lay flat property" where there are white spots and formation of wrinkles is observed.The rolled material was rewound and the presence or absence of waviness on the film surface was visually observed. ○... No waving △... Slight waving ×... Quite a lot of waving ``Hatting occurred...Rolling hardness'' Rolls were left on two △-shaped pieces of wood for two weeks. The dents in the film at the parts that came into contact with the wood were visually observed. ○...Almost no dents are observed △...Some dents are observed ×...Significant dents are observed

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Claims (1)

[Claims] 1. 100 parts by weight of vinyl chloride resin and 25 to 25 parts by weight of plasticizer
A resin composition containing 100 parts by weight is formed into a film by calender molding or extrusion molding, wound into a roll, cooled, and then unwound and coated with anti-adhesion fine powder on at least one side of the film. A method for producing a soft vinyl chloride resin film with good adhesiveness and good surface appearance, which comprises spraying and winding. 2 The winding temperature when the resin composition is made into a film by calendar molding or extrusion molding is 20°C.
A method for producing a soft vinyl chloride resin film with good tackiness and good surface appearance according to claim 1, wherein the temperature is 60°C. 3. A soft vinyl chloride resin film with good adhesiveness and surface appearance according to claim 1, characterized in that the temperature of the film when unwinding the cooled roll is 10 to 30°C. manufacturing method. 4. Good adhesion and surface appearance as set forth in claim 1, wherein the anti-adhesion fine powder is silicone oil, starch fine powder surface-treated with a fluorine compound, or tetrasilicon mica. A method for producing a soft vinyl chloride resin film. 5. The average particle diameter of the anti-adhesion fine powder is 1 to 30 microns, and the amount of spraying per ¹ m2 of film is 0.01 to 5.
5. A method for producing a flexible vinyl chloride resin film with good adhesiveness and surface appearance according to claim 1 or 4, characterized in that: g.