JPH0571019B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention efficiently and inexpensively produces a coextrusion molded laminate of vinyl chloride resin and expandable styrene resin that is firmly and uniformly integrated. The present invention relates to a method for manufacturing a coextrusion laminate that can be manufactured.

(Prior Art and Problems to be Solved by the Invention) For example, if we take a synthetic resin laminated heat insulating board used as a ceiling material, the laminated heat insulating board has conventionally
After a resin substrate is once formed, a foamed resin plate is adhesively fixed to the resin substrate using an adhesive or double-sided adhesive tape. As the material for the laminate, in order to make the laminate excellent in economy, rigidity, heat insulation, etc., vinyl chloride resin is used as the material for the resin substrate, and foaming resin is used as the material for the foamed resin board. It was common to use styrene resin.

By the way, in the conventional method of manufacturing a laminate by integrating a resin substrate and a foamed resin board by fixing them using an adhesive, it is difficult to apply the adhesive uniformly, and there are areas with poor adhesion. It is easy to occur,
Over the years, there has been a problem in that the resin substrate and the foamed resin board partially peel off and the desired heat insulation effect is no longer achieved. In addition, when it comes to adhesive integration, it is difficult to apply the adhesive, so
There is a limit to the width of laminates that can be manufactured, and it has been extremely difficult to manufacture laminates that are too wide. Furthermore, the process of applying the adhesive was labor-intensive, resulting in poor productivity, and the adhesive was also expensive.
Another problem was that the manufacturing cost of the laminate increased. In addition, the conventional method of manufacturing a laminate by integrating a resin substrate and a foamed resin board by fixing them using double-sided adhesive tape has poor production efficiency and is difficult to manufacture due to the high cost of double-sided adhesive tape. There was a problem that led to an increase in costs.

Since the above-mentioned problems existed in bonding and integrating separate parts, we decided to co-extrude vinyl chloride resin and expandable styrene resin to achieve the desired goal. Some attempts have also been made to manufacture laminates. In addition, in the coextrusion molding, since the adhesiveness between the vinyl chloride resin and the expandable styrene resin is poor, it is essential to interpose an adhesive at the interface between the resins during coextrusion. However, such coextrusion using an adhesive has the advantage of being able to continuously manufacture laminates and improving productivity, but it also has the following unavoidable problems: , it is considered to be quite difficult to put it into practical use.

First of all, there was a problem in that it was difficult to stably produce a laminate having uniform quality (particularly, no variation in adhesive strength).

In other words, it is necessary to combine three types of resins, vinyl chloride resin, expandable styrene resin, and adhesive, in the mold, which makes the structure of the mold complicated, and as a result, resin stagnation occurs. Resin seizure is likely to occur; in addition, in addition to two extrusion molding machines for resin extrusion, an additional extrusion molding machine for adhesive is required, so two extrusion molding machines are targeted. In addition, the difficulty in controlling the flow rate balance is doubled compared to the case where the flow balance is It has been difficult to stably produce laminates with uniform quality due to the many constraints on extrusion molding, such as the fact that .

Second, there was the problem that manufacturing costs were extremely high.

That is, since three extrusion molding machines are required, the equipment cost is high compared to the added value of the product;
A fairly large space is required to install the three extrusion molding machines; a control device is also required to properly control the three extrusion molding machines (controlling the flow rate balance, controlling the appropriate temperature conditions, etc.) Moreover, the manufacturing cost was high because the mold was complicated, and the adhesive was expensive, which caused the problem of extremely high manufacturing costs.

As a result of a detailed study of the above-mentioned problems, the inventor of the present invention found that these problems can be solved by ``attempting to integrate both resins by interposing an adhesive at the interface between the two resins.''
This is due to the fact that if one of the resins is modified to be highly compatible with the other resin, the aforementioned problems associated with coextrusion of both resins can be solved at once. We have obtained knowledge that this may be the case.

The present invention was completed by further developing this knowledge.

(Means for Solving the Problems) A method for manufacturing a coextrusion laminate according to the present invention (hereinafter referred to as a manufacturing method) comprises: a vinyl chloride resin;
A modified foamable styrenic resin whose compatibility with the vinyl chloride resin has been improved by blending a modifier with an acrylic resin and/or a vinyl acetate resin; and a lamination of both resins. This method is characterized by manufacturing bodies (laminates having various forms such as plate-like laminates and channel-like laminates).

(Example) Examples of the present invention will be described below.

The manufacturing method of the present invention is to co-extrude a vinyl chloride resin and a modified expandable styrene resin to manufacture a desired laminate.

Examples of the modifier include acrylic resins and vinyl acetate resins, which have the above-mentioned compatibility-improving effect and are available at relatively low cost. The acrylic resin modifier includes methyl methacrylate resin, methyl methacrylate-butadiene-styrene terpolymer, acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene terpolymer, chlorinated polyethylene or NBR, Synthetic rubber such as SBR can be suitably employed, and ethylene-vinyl acetate copolymer can be suitably employed as the vinyl acetate resin modifier.

Next, a blending example of a vinyl chloride resin extruded material (mainly composed of vinyl chloride resin) and a foamable styrene resin extruded material (mainly composed of styrene resin) will be shown. In addition, in the following formulation examples, "parts" refer to parts by weight.

Blend example of vinyl chloride resin extrusion material (1) Vinyl chloride resin: 100 parts Stabilizer: 3 to 5 parts Lubricant: 0.5 to 3 parts Filler: 5 to 20 parts Colorant: 0.5 to 2.0 parts Vinyl chloride resin extrusion material Blend example (2) Vinyl chloride resin: 100 parts Organic blowing agent: 0.3 to 0.5 parts Stabilizer: 3 to 5 parts Lubricant: 0.5 to 3 parts Filler: 5 to 20 parts Colorant: 0.5 to 2.0 parts Foaming Compounding example of extruded styrenic resin material (1) Expandable polystyrene: 90 parts Acrylonitrile-styrene copolymer (modifier): 10 parts Talc: 0.5 part Inorganic blowing agent: 0.5 part Expandable styrenic resin extruded material Blend example (2) Expandable polystyrene: 100 parts polymethyl methacrylate (modifier):
3 to 5 parts Talc: 0.5 parts Inorganic blowing agent: 0.5 parts Formulation example of expandable styrenic resin extrusion material (3) Expandable polystyrene: 100 parts Ethylene-vinyl acetate copolymer (modifier):
3 to 5 parts Talc: 0.5 parts Inorganic blowing agent: 0.5 parts Compounding example of expandable styrenic resin extrusion material (4) Expandable polystyrene: 90 parts Acrylonitrile-styrene copolymer (modifier): 10 parts Ethylene acetic acid Vinyl copolymer (modifier): 5 parts Polymethyl methacrylate (modifier): 1 part Talc: 0.5 part Inorganic blowing agent: 0.5 part The two types of extrusion materials blended as above,
When fed to each of two extrusion molding machines and coextruded, the foamable styrene resin has been modified to be highly compatible with the vinyl chloride resin, so for example, as shown in Figure 1, A laminate 1 with excellent heat insulation and rigidity, in which a resin substrate 2 made of vinyl chloride resin and a foamed resin board 3 made of foamed styrene resin (expansion ratio is, for example, about 5 to 15 times) are firmly and uniformly integrated. will be manufactured continuously.

Note that the extruded vinyl chloride resin material may or may not contain an organic blowing agent, but as shown in the formulation example (2) of the extruded vinyl chloride resin material, it may contain about 0.3 to 0.5 parts of an organic blowing agent. In the case where the vinyl chloride resin is made into a foam of about twice the size, the foaming pressure during molding of the resin substrate causes the resin substrate and the foamed resin plate to be strongly pressed together at the contact surfaces, and furthermore, Since the contact surface of the resin substrate becomes rough due to the foaming, this also exerts an anchoring effect, resulting in a laminated structure in which the resin substrate and the foamed resin board are integrated more firmly and uniformly. The body will be obtained.

(Effect of the invention) The manufacturing method according to the present invention includes a vinyl chloride resin,
In order to coextrude a modified expandable styrene resin that has excellent compatibility with the resin, we can efficiently produce a coextrusion molded laminate in which vinyl chloride resin and expandable styrenic resin are firmly and uniformly integrated. It can be manufactured at low cost.

[Brief explanation of drawings]

FIG. 1 is a perspective view illustrating a laminate manufactured by the manufacturing method of the present invention. 1... Laminated body, 2... Resin substrate, 3... Foamed resin board.

Claims (1)

[Claims] 1. Coextrusion of a vinyl chloride resin and a modified expandable styrenic resin whose compatibility with the vinyl chloride resin has been improved by blending a modifier with an acrylic resin and/or a vinyl acetate resin. A method for producing a coextrusion-molded laminate, comprising: producing a laminate of both resins.