JPS63249605A - Manufacture of inorganic extrusion molded form - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a method for producing an inorganic extrusion molded article, and more specifically, it relates to a method for producing an inorganic extrusion molded article, and more specifically, to obtain good surface properties when extruding an inorganic material mixed with synthetic resin particles and curing and curing the inorganic material. The present invention relates to a novel method by which a molded article having the following properties can be obtained.

<Prior art> A kneaded product made of an inorganic material such as cement or gypsum as the main component and mixed with lightweight synthetic resin particles such as fine styrofoam particles is extruded and then cured in an autoclave to obtain a hardened molded product. The weight of the molded body can be reduced by mixing synthetic resin particles, which are known to cause molding, and the synthetic resin particles melt due to the high heat during autoclave curing, making the inside of the molded body porous. Therefore, heat insulation and sound insulation properties are improved. Furthermore, since the molten synthetic resin adheres and impregnates the inner surface of the closed cells inside the molded body, the adhesion with the base material is improved, the strength is increased, and the waterproof property is improved.

<Problems to be Solved by the Invention> Although the extrusion molded product obtained by mixing lightweight synthetic resin particles as described above exhibits generally satisfactory characteristics, it also has some troublesome problems in practice. there were. That is, generally, the molded product immediately after being discharged from the extrusion molding machine is released from the molding pressure and expands, but especially when it contains synthetic resin particles with high compressive deformability such as foam,
During molding, the molded product, which was compressed into a flat shape, returns to its original shape as a result of being released from the molding pressure, causing the surface of the molded product to bulge and form an irregularly uneven surface. Furthermore, even when synthetic resin particles such as solid beads that are relatively difficult to compress and deform are used, a so-called springback phenomenon occurs greatly around the beads immediately after being discharged from the molding machine, causing beads existing near the surface to bulge on the surface. Similarly, an irregular uneven surface is formed.

As a result, as shown in the reference figure, the surface of the molded body A has an irregular uneven shape, and although the synthetic resin particles B are scattered inside the molded body, the base material surface layer C1 is extremely thin near the surface.
They are mixed together in a state where they are covered with a relatively thick surface layer C3. If the molded body is placed in an autoclave in this state, the synthetic resin particles will be melted by high heat and become porous, but in the process, the thin surface layer C1 that is scratched as the synthetic resin particles shrink will be destroyed and a crater will form. --shaped concave portions are formed, while the relatively thick surface layer C2 is cured as it is to form convex portions E, resulting in a molded product with extremely poor surface smoothness. Surface treatment after obtaining such a molded body not only complicates and complicates the process, but also requires applying a large amount of mortar to a thickness greater than necessary in order to smooth the uneven surface. It had the disadvantage that it required a lot of work. Furthermore, when applying a resin paint, it is difficult to eliminate irregularly uneven surfaces, and the design cannot be improved. Furthermore, the adhesion with these coating materials was not very promising.

Means for Solving the Problems The present invention was created to solve the above problems by extrusion molding a kneaded material made of an inorganic material as a main component and mixed with synthetic resin particles. An inorganic extrusion molded article, characterized in that the obtained molded article is placed in an autoclave to cure and harden the inorganic material, and at the same time, the synthetic resin particles are melted, and the surface of the thus obtained cured article is ground to a predetermined thickness. This is a manufacturing method.

<Detailed Description of the Invention> A kneaded product is prepared by mixing an inorganic material with synthetic resin particles as a main component.

Inorganic materials include hydraulic materials such as cement and gypsum, silicic raw materials and calcareous raw materials that react to produce calcium silicate hydrate, and are cured by autoclave curing to form the base material of the final product, the extrusion molded product. It is the raw material for eggplant.

The synthetic resin particles can be appropriately selected from foamed, unfoamed, solid beads, etc. of synthetic resin such as polyethylene, polystyrene, polypropylene, acrylic, and vinyl, but from the viewpoint of depollution, industrial It is preferable to use finely ground particles of Styrofoam waste.

If necessary, asbestos, synthetic fibers, carbon fibers, wood fibers, reinforcing fiber materials such as alkali-resistant glass fibers, forming aids such as methyl cellulose, air entrainment agents, etc. can be added to the mixed MTh. .

A kneaded product obtained by adding an appropriate amount of water to the above-mentioned raw materials is put into an extrusion molding machine and molded. When the molded product is discharged from the extrusion molding machine, as a result of being released from the molding pressure, the synthetic resin particles irregularly bulge the surface of the molded product, resulting in a non-uniform uneven surface.

Such a molded body is then placed in an autoclave. At this time, the inorganic material is hardened and becomes the molded body base material, and the synthetic resin particles dispersed inside the base material are melted by the high heat, forming many roughly spherical cavities and making the molded body porous. do.

Thereafter, the surface of the obtained cured molded product is ground to a predetermined thickness using an appropriate means such as a grinder, sander, sandblasting, etc. That is, as shown in Fig. 1, the molded body 1 cured and cured in an autoclave is similar to the one in the reference figure (right side) mentioned above, and its surface is unevenly roughened. By grinding to the imaginary line XX, an extrusion molded article according to the method of the present invention as shown in FIG. 2 can be obtained.

This body 1 has a base material 2 made of a hardened inorganic material.
A large number of closed cell pores 3, which are traces of melting of synthetic resin particles, are scattered inside. In addition, the surface of the base material 2 is made generally flat by the above-mentioned grinding process, and the recesses 4 are partially exposed on the surface. The recesses 4 are formed by grinding away a part of the roughly spherical synthetic resin melt trace, and can create a large number of recesses of various sizes on the surface of the base material, giving it an innovative design. At the same time, when applying mortar or paint to the surface of the molded article, it is possible to improve the anchoring effect for the coating material and increase the adhesion strength.

The molded body 1° shown in FIG. 3 is obtained by applying a surface layer composition mainly composed of cement slurry to the surface of the molded body 1 shown in FIG. In this way, a table N5 having a smooth surface without irregularities was formed.

In this case as well, the surface layer composition enters into the recesses 4 formed on the surface of the base material 2, increasing the adhesion strength.

A suitable resin such as urethane type, acrylic type, epoxy type, etc. can be added to the surface layer composition, and the surface layer 5 formed by adding the resin in this manner also functions as a waterproof layer.

In addition, by adding pigments, dyes, etc. to the surface layer composition and coloring it, it can be used as it is as a decorative board.
Alternatively, if the surface layer is colored white, the subsequent coloring can be carried out easily and easily.

In order to further increase the adhesion strength with the coating material such as mortar applied to the surface of the molded product or the surface composition, a large number of recesses 4 are formed by surface grinding of the cured molded product, especially only in the upper part of the spherical synthetic resin melt trace. It is preferable to form a large number of concave portions 4° in the shape shown in Fig. 4 on the surface by scraping off the surface.Such a surface shape cannot be formed by an embossing process, and it also provides an extremely innovative design. provide.

For this purpose, ultrafine vibrations are applied to the tapered tube section of the extrusion molding machine using ultrasonic waves or high frequency waves, thereby causing the kneaded material within the tube section to undergo ultrafine vibrations. As a result, the kneaded material becomes densified, and at the same time, the synthetic resin particles, which have a larger particle size and are lighter than inorganic materials such as cement, float upward inside the tapered tube and are extruded through a die to obtain any desired shape. The molded body is constructed so that the synthetic resin particles on the surface side thereof have a high density. By curing the thus obtained molded body in an autoclave and surface grinding in the same manner as described above, it is possible to uniformly form a large number of recesses 4 on the surface.
Moreover, by adjusting the amount of grinding, a 4° recess shaped as shown in FIG. 4 can be formed relatively easily and efficiently. As a result, design quality, yield rate, and productivity are improved.
Significantly improved.

<Effects of the Invention> According to the present invention, even when a kneaded product obtained by mixing synthetic resin particles into an inorganic material is extrusion molded, a molded product with excellent surface properties can be obtained, and it is possible to obtain a molded product with excellent design properties and coating materials. It is possible to manufacture interior and exterior building materials that have excellent adhesion to

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view schematically showing an extruded product obtained through an intermediate step of the method of the present invention, FIG. 2 is a cross-sectional view schematically showing a final product obtained by the method of the present invention, and FIG. FIG. 4 is a cross-sectional view schematically showing an extrusion molded product obtained by another embodiment of the method of the invention. FIG. Explanation of symbols 1... Molded object 2... Base material 3... Closed cell pores
4,4゜... Concavity 5... Cement surface helmet once, 2 m long, 3 days old. Child 4 Figure M'X

Claims (4)

[Claims] (1) A kneaded product containing an inorganic material as the main component and mixed with synthetic resin particles is put into an extrusion molding machine to be extruded, and the obtained molded product is put into an autoclave to cure the above-mentioned inorganic material. A method for producing an inorganic extrusion molded article, which comprises curing and melting the synthetic resin particles, and grinding the surface of the thus obtained cured article to a predetermined thickness. (2) A surface layer composition mainly composed of cement slurry is applied to the surface of the molded body obtained by the above grinding, and then cured and cured to further form a smooth surface layer. A method for producing an inorganic extrusion molded article according to claim 1. (3) The method for producing an inorganic extrusion molded article according to claim 2, characterized in that a synthetic resin is added and mixed into the surface layer composition. (4) The synthetic resin particles are floated above the kneaded material by applying vibrations to the kneaded material in the extrusion molding machine, thereby obtaining a molded body with a high density of synthetic resin particles on the surface side. , Claim 1 or 2
A method for producing an inorganic extrusion molded article as described in 2.