JPH0118596Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention relates to a welding rod used for joint welding of synthetic resin floor finishing materials having a terrazzo-like pattern and inlaid type floor finishing materials.

Inlaid type floor finishing materials are made by embedding different colored pellets or chips in a transparent resin layer, or by pressing only these pellets or chips into a sheet shape. It has a terrazzo pattern, and even if it wears down over many years of use, the same pattern will always appear from below. Since the floor finishing material has such characteristics, the welding rod used for finishing the joints must also have this characteristic, that is, the welding rod itself must have a terrazzo pattern or a pattern similar to a terrazzo pattern, and A characteristic required is that even if the joints are worn out over many years of use, the same pattern must always appear from below.

<Prior Art and Problems> Conventionally, welding rods of this type have been monochromatic, solid-colored, colorless, and transparent. With a single-colored, plain welding rod, the welded area is clearly distinguished from the ground and stands out, and in the case of a colorless, transparent welding rod, the V-cut line or butt part of the joint remains behind, as if it were a wound. This also has the drawback of not being resolved forever.

<Means for Solving the Problems> The present invention has been made as a result of various researches to eliminate such drawbacks and to obtain a welding rod having the various features described above.
This is a welding rod that has a transparent thermoplastic synthetic resin composition as a sea component and colored synthetic resin composition strips as an island component. The terms "sea component" and "island component" in this case mean that when a plurality of different or dissimilar materials are mixed or combined in a complex manner, the part that forms a continuous layer or continuous phase is called the sea component, and the continuous layer or The portion that exists as a granular or independent phase in the continuous phase is called an island component. The synthetic resin in the colored synthetic resin composition strips is basically a single composition of thermoplastic synthetic resin, but it can also be a mixed composition with thermosetting synthetic resin, or a single composition of thermosetting synthetic resin. good. When the synthetic resin in this colored synthetic resin composition strip is a thermoplastic synthetic resin, the melting temperature becomes a softening temperature in comparison with a transparent thermoplastic synthetic composition. That is, the welding rod according to the present invention is characterized in that the melting temperature or softening temperature of the transparent thermoplastic synthetic resin composition is lower than the melting temperature or softening temperature of the colored thermoplastic synthetic resin composition.

<Example> The synthetic resin constituting the welding rod of the present invention differs depending on what kind of synthetic resin the inlaid type floor finishing material is made of, but generally this type of floor finishing material is used. The main component of the material is vinyl chloride resin. Therefore, the synthetic resin of the welding rod, particularly the transparent thermoplastic synthetic resin composition 1 serving as the sea component, is a synthetic resin that is the same or has an affinity for vinyl chloride resin. In this way, when the synthetic resin component of the floor finishing material is vinyl chloride resin, the best results can be obtained if the transparent thermoplastic synthetic resin composition 1 in the welding rod is also vinyl chloride resin. However, vinyl chloride-vinyl acetate copolymer resins also give very good results in terms of weldability, and a mixture of this copolymer and pure vinyl chloride resin is suitable. Therefore, it is important to select and use a synthetic resin that is effective for welding floor finishing materials.

Transparent thermoplastic synthetic resin composition 1 means a mixture of synthetic resin components and other necessary components such as plasticizers and stabilizers, and if necessary, it is dyed in the same color as the floor finishing material. Sometimes it is colored and transparent sea ingredients.

The colored synthetic resin composition strips 2 serve as island components and are important in producing a pattern that is the same as or similar to the terrazzo pattern in the floor finishing material. The choice of synthetic resin for the colored strip 2 is therefore considered in relation to the transparent thermoplastic synthetic resin composition 1. That is, the colored strips 2 must maintain the shape of the terrazzo pattern when they are extruded from the extruder into welding rods and when they are welded to the joints of the floor covering. The colored strips 2 must have a melting temperature or softening temperature higher than the melting temperature or softening temperature of the sea component transparent synthetic resin composition 1.
In other words, when a rod-shaped or tape-shaped welding rod is extruded using an extruder, the colored strips 2 are not softened or welded very much under the temperature conditions during extrusion, and the transparent synthetic resin plastic material of the sea component is It is preferable that only 1 is softened, melted, fluidized, and extruded to form a rod-shaped or tape-shaped welding rod. Therefore, in other words, it is important that the melting temperature or softening temperature of the transparent thermoplastic synthetic resin composition 1, which is the sea component, is also lower than that of the colored synthetic resin composition strips 2, which are the island component.

The first means to meet this requirement is to use a resin with a low polymerization degree for the synthetic resin that will be the sea component, and a resin with a higher polymerization degree for the colored strips that will be the island component, in the case of the same type of thermoplastic rigid resin. It is better to use Also the second
As a means for this, it is preferable to use a copolymer resin such as a vinyl chloride-vinyl acetate copolymer resin, and use a homopolymer such as a pure vinyl chloride resin for the colored strips as the island component. This is based on the principle that vinyl chloride copolymer resins have significantly lower softening and melting temperatures than homopolymers at the same degree of polymerization. A third means to meet these requirements is to use a large amount of plasticizer in the composition of the sea component so that it flows at low processing temperatures, and to use a small amount of plasticizer in the composition of the colored strips of the island component. Therefore, it is also effective to harden the pieces to such an extent that the shape of the pieces does not change significantly at the flow temperature of the sea component. These first ~
Which of the third means to use should be arbitrarily selected and is not particularly limited.

A fourth and more effective method is to use a normal thermoplastic synthetic resin composition for the sea component, and to use a thermosetting synthetic resin alone composition or a thermosetting synthetic resin and a thermoplastic synthetic resin for the colored strips of the island component. There is a method using a mixed composition of A single composition of thermosetting synthetic resin is a colored and cured product of unsaturated polyester, epoxy resin, diallyl phthalate resin, etc., which is pulverized to a predetermined particle size, and a welding rod using this colored fine piece. forms an extremely fine terrazzo pattern. This is because the transparent thermoplastic synthetic resin composition 1 of the sea component softens, melts, and becomes fluidized by heating, but the colored strips 2 made of the thermosetting synthetic resin composition hardly soften or melt; A welding rod with an excellent terrazzo pattern can be obtained with no change in shape and the strip shape maintained.

This effect can also be obtained in a mixed composition of thermosetting synthetic resin and thermoplastic synthetic resin.

In this mixed composition system, combinations of vinyl chloride resin and diallyl phthalate, and combinations of vinyl chloride resin and NBR are particularly effective, and a welding rod with an excellent terrazzo pattern can be obtained.

In the production of the welding rod in the present invention, the transparent thermoplastic synthetic resin composition 1, which will be the sea component, is fed from the usual hopper section of an extruder, and the colored synthetic resin composition strips 2, which will be the island component, are fed through the vent of the extruder. This method involves supplying the mixture through a hole or a supply hole provided in the body of the extruder, mixing the two, and extruding the mixture into a rod or tape shape. Although this extruder is not particularly limited, adding the colored strips 2 midway through the extruder to avoid excessive kneading of the colored strips gives the welding rod an excellent terrazzo pattern. Because of this requirement, a vent-type extruder is most suitable.
However, even a normal extruder is not limited to the vent type, as long as a feeding hole for colored strips is provided in the body and the colored strips are pushed through there.

For extruders other than the vent type, the setting position of the strip supply section is a problem, but approximately one-third of the extruder's die position on the body is suitable. This position will vary depending on the type of synthetic resin used, but since it is difficult to make the supply hole variable,
It is suitable to control the deformation imparted to the colored strip by varying the screw rotation speed and heating temperature.

Generally, round welding rods with a diameter of 3 mm or 5 mm are used, but tape-shaped welding rods with a thickness of 2 mm and a width of 10 mm to 20 mm are also used when floor finishing requires water resistance and watertightness. In the case of tape-shaped welding rods, the requirements for the terrazzo pattern are stricter than those for round-bar-shaped welding rods.

The mixing ratio of the transparent thermoplastic synthetic resin composition 1 as the sea component and the colored strips 2 as the island component is also important. Basically, the mixing ratio differs depending on the pattern of the flooring material, but it is mostly sea component 1.
On the other hand, if the ratio of the island component is 0.3 to 0.7, the deformation and fluidization of the pieces will be small. When this ratio becomes 1:1, the sea component and the island component mix or phase inversion occurs, causing the terrazzo pattern to collapse and become a marble-like flowing pattern.

The welding rods obtained in this way are applied to the floor covering joints with a conventional hot-air welding machine, but they can also be used with an automatic welding machine, for example a Leister Varius automatic welding machine. This automatic welding machine can also automatically weld tape-shaped welding rods by replacing the adapter.

The terrazzo-patterned floor finishing material subjected to joint welding in this manner has excellent water resistance and watertightness, and provides a floor surface with no discomfort in the pattern.

Next, specific aspects of the present invention will be explained in more detail.

(1) Transparent thermoplastic synthetic resin composition (sea component) Vinyl chloride-vinyl acetate copolymer resin 100 parts by weight (vinyl acetate amount 5%, degree of polymerization = 800) D O P 55 parts by weight Epoxidized soybean oil 4 Parts by weight Stabilizer (liquid) 3.5 parts by weight The above mixture was stirred with a Henschel mixer to obtain a uniform dry blend, and when cooled with a cooler mixer, a smooth powdery compound was obtained. This powdered compound could be fed directly to the hopper of the extruder.

(2) Colored synthetic resin composition strips (island component) {vinyl chloride resin 100 parts by weight (=1000) DOP 45 parts by weight Epoxidized soybean oil 4 parts by weight Stabilizer (liquid) 4 parts by weight Heavy calcium carbonate 200 parts by weight Pigment} Appropriate amount In the above formulation, only the pigment components were changed as shown below to create four colors.

White Color {Titanium white, yellow lead} 1% added Yellow {Titanium white, chrome permillion, benzidine yellow} 0.5% added dark brown {Carbon black, valve handle, yellow, lead} 0.5% added, gray {Titanium white, carbon black, valve handle, yellow, lead} Addition of 1.5% After making the mixture of each color into a powdered compound using the same procedure as in (1) above, use an extruder to form a compound with a width of 30 cm and a thickness of 30 cm.
It was processed into a 0.8mm sheet. The sheet was then milled to obtain strips with a particle size of 0.5-1.5 mm. The four colors listed above were processed into strips using the same method.

(3) Forming of welding rod A welding rod was molded under the following conditions.

Extruder Screw diameter 50mm L/D 25:1 Type Bent type Screw rotation speed 40RPM Production method 5mmφ x 6 pieces Production speed 15m/min Discharge rate Approx. 40Kg/hour Heating temperature 130-150℃ Colored strips supplied from vent hole Quantitative Indentation method Colored strips mixing ratio (:::) 1:2:1 Sea component: Island component 1:0.45 to 1:0.65 The obtained welding rod with a diameter of 5 mm has an extremely beautiful terrazzo with little deformation of the colored strips. It had a pattern on it.

<Effect> Use this welding rod to add 1 strip of each color according to (2) above.
When welded the mixed strips to the joints of a terrazzo-patterned sheet made from raw materials at a ratio of 1:1:1, we obtained strength of 24.4 kg/3 cm width for V-cut joints and 27.4 kg/3 cm width for 1.5 mm open joints. Ta. This strength was almost a value close to the breaking strength of the sheet material. After cutting off the ridges of the welded part with a kawasaki, the surface had a terrazzo pattern so tight that it was almost indistinguishable from the terrazzo pattern on the sheet surface.

[Brief explanation of the drawing]

The drawings show an example of the implementation of the welding rod of the present invention. Fig. 1 is a perspective view, Fig. 2 is an enlarged sectional view taken along line 2-2, and 1 in the drawing shows the transparent heat of the sea component. The plastic synthetic resin composition 2 is a colored synthetic resin composition strip as an island component.

Claims (1)

[Claims for Utility Model Registration] (1) A transparent thermoplastic synthetic resin composition having a lower melting temperature or softening temperature than the colored synthetic resin composition of the island component is used as the sea component, and the sea component contains the transparent thermoplastic resin composition. A welding rod made by mixing colored synthetic resin composition strips, which have a higher melting temperature or softening temperature than a thermoplastic synthetic resin composition, as an island component. (2) The welding rod according to claim 1, wherein the colored synthetic resin composition strip is a thermosetting synthetic resin composition or a mixed composition of a thermosetting synthetic resin and a thermoplastic synthetic resin.