JPH01174758A - Manufacture of abrasion resistant sheet - Google Patents

Abstract

PURPOSE:To aim at the maintenance of good abrasion resistance over a long period of time by heating a laminated product made up of flowing down and osmosing a mixed sol, containing an inorganic solid portion, on the surface of a sintered body of synthetic resins, gelatinizing this mixed sol, and forming the surface so smoothly. CONSTITUTION:An aggregate 11 of each plastic pellet 10 being fed to a belt conveyor 1 passes through a front stage heating furnace 4, forming a sintered body 12. When a mixed sol 13 containing an inorganic solid portion is made to flow down on a surface of this sintered body 12, it is osmosed up to a clearance between plastic pellets 10 themselves, and in the case where the sintered body 12 is not fully cooled, the liquid portion is properly evaporated, and thereby viscosity of the mixed sol 13 is naturally adjusted. A laminated body 14 obtained passes through a rear stage heating furnace 6 and, after forming a gel layer 3, the surface is smoothly molded. With this constitution, the solid portion is hard to cause its surface separation, so that abrasion resistance is favorably maintainable over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for manufacturing a wear-resistant sheet whose surface is rich in inorganic solids.

[Conventional technology]

Conventionally, this type of wear-resistant sheet has been produced by heating an aggregate of synthetic resin pellets to obtain a sintered body made of a synthetic resin layer, and then coating the surface of the sintered body with inorganic solid matter, such as powder particles of aluminum oxide. It was manufactured by top coating the body.

[Problem that the invention seeks to solve]

In abrasion-resistant sheets manufactured by conventional methods, the inorganic solid content easily peels off from the surface, and in order to maintain good abrasion resistance over a long period of time, a large amount of inorganic solid content must be top coated. There wasn't. However, doing so not only leads to increased costs, but also makes it difficult to improve the surface smoothness by molding, and if the resin sheet itself is made transparent or colored, the transparency or coloring may affect the surface. There was a problem in that it was significantly damaged by the solid content.

The present invention has been made in view of the above problems, and provides a method for producing an abrasion-resistant sheet in which a gel layer containing inorganic solids is bitten into the surface of a synthetic resin layer. Even if the amount of solid content used is small, the solid content on the surface becomes rich, maintaining good wear resistance over a long period of time, and obtaining an inexpensive wear-resistant sheet with excellent surface smoothness. purpose.

[Means for solving problems]

The method for producing a wear-resistant sheet of the present invention includes heating an aggregate of synthetic resin pellets to obtain a sintered body comprising a synthetic resin layer;
By flowing a mixed sol containing inorganic solids onto the surface of the sintered body, the mixed sol penetrates into the voids on the surface of the sintered body, and the resulting laminate is heated to gel the mixed sol. It is used to form a smooth surface.

[For production]

According to the present invention, the mixed sol that has penetrated into the gaps between the synthetic resin pellets formed on the surface of the sintered body is gelled by the heat of the sintered body or by subsequent heating. Therefore, the gel containing the inorganic solid remains in the gap. Further, the gel that has bitten into the gap further bites into the gap during the process of smoothing the surface of the laminate.

[Example] Fig. 1 schematically shows an apparatus for continuously carrying out the present invention, in which 1 is a conveyor, 2 is a supply hopper for synthetic resin pellets, 3 is a spreading bar, and 4 is a Front stage heating furnace, 5
numeral 6 indicates a paste supply hopper, numeral 6 indicates a post-heating furnace, and numeral 7 indicates polygingerol.

The synthetic resin pellets 10 supplied from the supply hopper 2 to the conveyor 1 are made of soft polyvinyl chloride resin (PV
C'') fine granule pellets can be suitably used, but even if it is a tri-blend of PvC fine granule pellets and other types of fine granule pellets, or other thermoplastic synthetic resin pellets. Good. Conveyor 1
The synthetic resin pellets 10 supplied are made into an aggregate 11 and are sent to a uniform thickness by a spreading bar 3, after which they pass through a pre-heating furnace 4. In the preheating furnace 4, the aggregate 11 is heated and the individual synthetic resin pellets 10 are thermally fused to each other to form a sintered body 12. This sintered body 12
The gaps formed between the individual synthetic resin pellets 10 are exposed on the surface. Therefore, the heating temperature in the preheating furnace 4 must be set to such a temperature that such gaps remain, and the synthetic resin pellets 10 must be
160-200 in the case of vC fine granular pellets
Approximately ℃ is appropriate. If the heating temperature is lower than this, the heat fusion of the individual synthetic resin pellets 10 will be insufficient, and the strength such as tensile strength required for a wear-resistant sheet will not be obtained.If the heating temperature is higher than this, the synthetic resin There is a risk that the pellets 10 will be completely melted and the surface will become smooth and that sufficient gaps will not remain on the surface.

A mixed sol 13 containing inorganic solids is flowed down from the paste supply hopper 5 onto the sintered body 12 that has exited the preheating furnace 4 . It is not necessary for the sintered body 12 to be completely cooled down when the mixed sol 13 flows down, and the sintered body 12 is cooled to a temperature that does not immediately start gelling when the mixed sol 13 comes into contact with the sintered body 12. Sometimes the sol may be allowed to flow down, which has the advantage of not only improving productivity but also helping to adjust the viscosity of the mixed sol 13, which will be described later. The mixed sol 13 that has flowed down onto the upper layer of the sintered body 12 not only accumulates in layers on the surface of the sintered body 13 as illustrated in FIG. Synthetic resin pellets 1
If the sintered body 12 is not completely cooled, it will be heated by the sintered body 12 and the liquid component will evaporate appropriately, and the viscosity of the mixed sol 13 will decrease. is adjusted naturally. As the inorganic solid content which is one of the components of the mixed sol 13, it is possible to use fine powder of aluminum oxide or other fine powder of inorganic material.

Moreover, mineral spirit in which the sintered body 12 is insoluble can be suitably used as the liquid component of the mixed sol. When the synthetic resin pellets 10 are soft PvC fine-grained pellets and fine powders of aluminum oxide are used as the inorganic solid content of the mixed sol 13, the particle size of the powders is 5 to 5.
It is preferable to select a range of 100 μm and set the blending ratio in the mixed sol 13 to 5 to 30 parts per 100 parts of base resin. It is difficult to obtain aluminum oxide with a particle size smaller than 5 μm, and even if it is available, it is expensive and tends to increase the cost of the wear-resistant sheet. If the particle size is larger than 100 μm, there is a risk that the aluminum oxide will not sufficiently penetrate into the above-mentioned gaps, and in this case, it will be difficult to sufficiently prevent surface peeling due to the biting phenomenon described below. Further, if the blending ratio of aluminum oxide is less than 5 parts, the solid content on the surface of the wear-resistant sheet is difficult to become rich, and if it is more than 30 parts, the amount of solid content used becomes large, which causes an increase in cost. The composition example shown below is a preferred blending ratio of the mixed sol 13 and forms an organosol.

PVC base resin 100 parts DOP 35 parts Mineral spirit 10 parts Stabilizer (Ba-Zn type) 3 parts Aluminum oxide (α type), 10 parts In addition, instead of the PvC paste resin of the above organosol, for example, urethane resin or epoxy resin etc. sintered body 1
It is also possible to use a resin that is compatible with No. 2 and has high material strength and whose viscosity can be adjusted.

The laminate 14 formed by flowing the mixed sol 13 onto the sintered body 12 passes through the latter heating furnace 6, during which the mixed sol 13 is heated and gelled, forming a gel layer 13a. This laminate 14 is then molded with polygingerol 7 to have a smooth surface and rolled as a product. The surface of the abrasion-resistant sheet molded with polygingerol 7 is almost completely covered with the gel layer 13a, so it is rich in solids and is nevertheless relatively smooth as shown in FIG. Note that a part of the sintered body 12 may be exposed on the surface.

〔Effect of the invention〕

The wear-resistant sheet manufactured by the present invention has a gel layer containing inorganic solids formed on the surface, so the surface is rich in solids, and even if the amount of solids used is small, it has good wear resistance. sexuality is demonstrated.

In addition, since the gel layer digs into the surface of the sintered body of the synthetic resin layer, the solid content does not cause surface peeling.
<Abrasion resistance is maintained well over a long period of time. Furthermore, since the amount of inorganic solid content used can be kept low, it is easy to finish the surface smoothly, and even if the resin layer is transparent or colored, the solid content will reduce its transparency and coloring. It has the advantage of not being compromised and can be manufactured at low cost. Such a wear-resistant sheet can be used as a flooring material in places where walking is frequently performed.

[Brief explanation of the drawing]

Fig. 1 is a side view schematically showing an apparatus for continuously carrying out the present invention, Fig. 2 is a partially enlarged cross-sectional view of the mixed sol flowing down onto the surface of a sintered body, and Fig. 3 is a partially enlarged sectional view of the mixed sol in a gelled state. 10...Synthetic resin pellets, 11...Aggregation of synthetic resin pellets, 12...Sintered body, 13...Mixed sol. Patent applicant Takiron Co., Ltd.

Claims (1)

[Claims] (1) A sintered body consisting of a synthetic resin layer is obtained by heating an aggregate of synthetic resin pellets, and the mixed sol containing inorganic solids is allowed to flow down onto the surface of the sintered body, thereby sintering the mixed sol. A method for manufacturing an abrasion-resistant sheet, which comprises infiltrating the pores on the surface of a body, heating the laminate thus obtained, gelling the mixed sol, and shaping the surface into a smooth one.