JPS6054169B2 - Method for manufacturing vinyl chloride resin film or sheet with wood grain pattern - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a vinyl chloride resin film or sheet having a wood grain pattern. The present invention relates to a method for producing a vinyl chloride resin film or sheet having a wood grain pattern similar to natural wood grain, which cannot be obtained by conventional methods, and in which countless colored streaks of different sizes appear.

Conventionally, a method known to obtain a synthetic resin molded article with a flowing pattern is to mix a thermosetting resin, glass powder, metal powder, fiber, etc. with a thermoplastic resin, but the affinity between the base resin and the mixed substance is However, the molded product had defects such as unevenness on the surface and weakened strength.

In addition, a method using uniquely colored fibers or thermoplastic resin flakes with a slightly higher softening point than the base resin is disclosed in Japanese Patent Application Laid-Open No. 46-80.
684, disclosed in Japanese Patent Application Laid-Open No. 48-32151,
All of them are characterized by a spotted pattern.

Furthermore, Japanese Patent Publication No. 10379/1979 discloses a method of injection molding by mixing different colored resins that are compatible and have different fluidity, but the pattern is either a simple suminagashi pattern or a marble pattern. Ta.

Furthermore, Japanese Patent Publication No. 17177 discloses a method of adding a powder pigment based on vinyl chloride resin to vinyl chloride resin pellets and extrusion molding, but in this case, since the pigment is fine, the entire base resin is likely to be colored. It was hot.

The present invention has a suitable affinity with the base vinyl chloride resin within the temperature range of processing the vinyl chloride resin film or sheet by the calendaring method to the base vinyl chloride resin powder,
In addition, a film or sheet is produced by mixing granular colored thermoplastic resins with different fluidity and performing a normal calendering process, that is, blending → kneading → melt rolling, and the color changes along the machine direction of the film or sheet. This method is used to obtain a film or sheet in which countless streaks of various thickness and length appear.

Each of these color stripes is rod-shaped or needle-shaped, and is not only dispersed within a plane, but also has a pattern that overlaps in the thickness direction, and the color and shade of each color stripe are subtle. This difference results in a film or sheet with a wood grain pattern that closely resembles natural wood grain. The present invention will be explained in detail below.
The characteristics of the present invention are that the degree of kneading is relatively shallow and the melt-rolling mechanism is used as the main mechanism in order to avoid excessive dispersion of pigment in the base vinyl chloride resin, resulting in a suminagashi pattern. The purpose of the present invention is to use the powder method and mix a granular colored thermoplastic resin that has an appropriate affinity with the powdered base vinyl chloride resin and has a different fluidity.

In the T-die extrusion method, which is another typical film or sheet manufacturing method, the degree of kneading is too deep and pigments are excessively dispersed, resulting in a suminagashi pattern instead of the desired clear color streaks. Here, the base vinyl chloride resin includes not only vinyl chloride homopolymers but also vinyl chloride copolymers such as vinyl chloride-vinyl acetate, vinyl chloride-ethylene, vinyl chloride-propylene, vinyl chloride-ethylene-vinyl acetate, etc. Additives such as stabilizers, lubricants, plasticizers, reinforcing agents, and colorants are also included as appropriate. The granular colored thermoplastic resin (hereinafter abbreviated as colored granular resin) to be mixed with the base vinyl chloride resin is heated at a normal calendering temperature of 140°C to 23°C.
It is a resin that has a moderate affinity with vinyl chloride resin and has different fluidity, and the number of colors is one or more, and a plurality of colored granular resins are used in combination depending on the purpose.

When the base vinyl chloride resin and the colored thermoplastic resin are both in powder form, the dispersibility is improved, so the color streaks become weak and unclear, and in the extreme, a single color results.

If the base vinyl chloride resin is granular, excessive shearing stress is applied during the kneading process, which also causes the color streaks to become unclear.

In the present invention, the colored granular resin has a 10 mesh bath ~
By setting the particle size to 100 mesh, it is possible to suppress dispersion and to prevent the pigment from dissolving in the base vinyl chloride resin as much as possible. Of course, in order to make color streaks appear clearly, as mentioned above, not only the particle size limitation but also the compatibility and fluidity between the base vinyl chloride resin and the colored granular resin are important factors.

If the compatibility is too good, the pigment will be excessively dispersed and the color streaks will become unclear, and if the compatibility is too poor, the particulate resin will remain scattered and no color streaks will be formed, and the film or sheet will become brittle and cannot be used. Even when the fluidity is the same, color lines become unclear. Examples of thermoplastic resins that meet the above conditions include polymethyl methacrylate resin, AS resin, AB
SM resin etc. are suitable.

Colored granular resin can be produced by dispersing and mixing a thermoplastic resin, pigment, and dispersant and making it directly into pellets of the desired size using an extruder, or by crushing the sheet or coarse pellets and making them into the desired size. is prepared by a method such as sieving.

The amount of the colored granular resin added can be changed depending on the desired pattern and the pigment concentration of the colored granular resin, but it is preferably about 0.1 to 10 parts by weight from the viewpoint of appearance of color streaks, color tone, strength, etc. Although only one color of colored granular resin may be added, the effect is further enhanced by mixing several colored granular resins to bring out the natural woody feel.

Individual thin color streaks of each color are formed, and the overall color tone is synthesized, creating a deep woody texture. In particular, when a resin with good transparency is used for the base PVC resin and the colored granular resin, overlapping color streaks appear in the thickness direction of the film or sheet, resulting in a deep and voluminous wood grain pattern that cannot be produced by printing. A film or sheet is obtained.

In addition, when a non-colored transparent granular thermoplastic resin that has a moderate affinity with the base vinyl chloride resin is mixed with the base vinyl chloride resin and colored granular resin, subtle shades of color can be created in areas other than color streaks. In some cases, it is even more effective. This will be explained below using examples.

Example 1 (Price was mixed with a Henschel mixer to obtain a base vinyl chloride resin powder.

The mixture was dispersed and mixed into approximately 3TnIn square pellets using an extruder, and the pellets were further crushed using a crusher.
Only the particles of 0 mesh ◆ bath to 100 mesh on were sieved and made into colored granular resin.

In this way, colored granular resins in four colors of red, yellow, brown, and black were prepared.

Next, 0.5 parts by weight of colored granular resin for each color was added to 10 parts by weight of the base vinyl chloride resin, and the mixture was dispersed and mixed using a Henschel mixer. Thickness 0.1 with this roll calender
A sheet of 5TnIn was produced.

The resulting sheet has a length of 0.5 along the sheet machine direction.
~3077!77! , width 0.03Tnm ~ 1.077!
77! Fine color streaks appeared, and the individual colors were separated, closely resembling natural wood grain. Comparative Example 1 When the same base vinyl chloride resin powder and colored granular resin as in Example 1 were dispersed and mixed using a Henschel mixer and an extruded sheet was produced using the T-die extrusion method, a sheet in which the pigment was excessively dispersed in the base resin was obtained. Therefore, a sheet having the desired wood grain pattern could not be obtained.

Example 2 Using the same basic vinyl chloride resin powder as in Example 1, colored granular resin was produced in the same manner as Todoroki Ii♀. Particle size 2
0 mesh●Bass~60 mesh●On red, yellow, brown,
Example 1 Using four colors of black, 0.5 parts by weight of each color of colored granular resin was added to 10 parts by weight of the base vinyl chloride resin.
A sheet with a thickness of 0.15w1 was produced in the same manner as above.

The resulting sheet has a length of 0.5 along the sheet machine direction.
TsfL ~ 20Wr1n1 There are countless fine color streaks in the order of 0.03 to 10 in width, and because the sheet has good transparency, the color streaks overlap many times in the thickness direction of the sheet, resulting in a very deep color. A material with a certain wood grain pattern was obtained.

Example 3 A base vinyl chloride resin was mixed in a shell mixer to obtain a base vinyl chloride resin powder.

To 100 parts by weight of the base vinyl chloride resin, 0.5 parts by weight of each color of red, yellow, brown, and black colored granular resin used in Example 2 and 5 parts by weight of non-colored granular PMMA were added,
A sheet having a thickness of 0.15 gourd was produced in the same manner as in Example 2.

In addition to the color stripes, the sheet obtained had color shading in areas other than the color stripes, and had an excellent design effect that was closer to a natural wood grain pattern than the sheet obtained in Example 2. .

Claims (1)

[Claims] 1. Based on 100 parts by weight of powdered base vinyl chloride resin,
One or more colored granular thermoplastic resins having a moderate affinity with the vinyl chloride resin, having different fluidity, and having a particle size of 10 mesh pass to 100 mesh on, 0.1 to 10 A method for producing a vinyl chloride resin film or sheet having a wood grain pattern, which comprises mixing parts by weight and calendering. 2. The method according to claim 1, wherein both the base vinyl chloride resin and the granular thermoplastic resin are transparent. 3. The method according to claim 1 or 2, wherein the particulate thermoplastic resin is polymethyl methacrylate. 4 For 100 parts by weight of powdered base vinyl chloride resin,
A granular thermoplastic resin having a moderate affinity with the vinyl chloride resin, having different fluidity, and having a particle size of 10 mesh pass to 100 mesh on, which is colored among the granular thermoplastic resins. A polyvinyl chloride resin film having a wood grain pattern, which is prepared by calendering 0.5 to 15 parts by weight of a polyvinyl chloride resin film and 0.1 to 10 parts by weight of an uncolored material, and calendering the mixture of one type or two or more types of each. Or the manufacturing method of the sheet. 5. The method according to claim 4, wherein both the base vinyl chloride resin and the granular thermoplastic resin are transparent. 6. The method according to claim 4 or 5, wherein the particulate thermoplastic resin is polymethyl methacrylate.