JPH05345842A - Compound resin composition for bent sheet - Google Patents

Abstract

PURPOSE:To provide the non-toxic compound resin composition having high rigidity and high heat resistance, having an easy combustion characteristic due to its low calorie, and excellent in a shape-retaining characteristic after subjected to a bending processing. CONSTITUTION:This resin composition comprises 100 pts.wt. of polypropylene and/or high density polyethylene and 25-300 pts.wt. of an inorganic filler and/or an organic filler. The inorganic filler is preferably calcium carbonate, talc, coal ash, furnace slag, etc. The organic filler is e.g. wood meal, rice hull or pulp. The composition is preferably produced by mixing the components generally with a tumbler mixer, a V blender, etc., and subsequently melt-kneading the mixture with a Bambury mixer, etc.

Description

Detailed Description of the Invention

[0001]

INDUSTRIAL APPLICABILITY The composite resin composition of the present invention has nontoxicity, low calorie, incineration characteristics, high rigidity and high heat resistance, and has excellent rebound elasticity after bending and excellent bending workability. It is suitable for molding a sheet.

[0002]

2. Description of the Related Art Conventionally, a sheet used for a desk calendar case or the like has been manufactured by punching a polyvinyl chloride sheet and then bending it. However,
Such products are inferior in heat resistance and easily deformed when kept at high temperature for a long period of time, and most of them are discarded and incinerated at the end of the use period, at which time harmful gases such as chlorine gas are generated. I'm worried. Therefore, there is a use of polyolefin as a solution to this problem, and there is no concern about the generation of harmful gas during incineration, but it is known that the generation of high energy due to combustion shortens the life of the incinerator remarkably. Further, when polyvinyl chloride or polyolefin is used as a sheet, rigidity is insufficient unless it is made thick, and when bent legs are provided, bending of the legs occurs.

[0003]

SUMMARY OF THE INVENTION According to the present invention, no harmful gas is generated during incineration, the combustion energy is low, the life of the combustion furnace is not shortened, the rigidity is high and the thin wall does not bend, and the heat resistance is high. To provide a composite resin composition for sheet molding, which has good properties, does not deform at high temperature, has high rebound resilience after bending even with high rigidity, and has excellent shape retention after bending. Is.

[0004]

That is, the present invention can be bent by mixing 25 to 300 parts by weight of an inorganic and / or organic filler with 100 parts by weight of polypropylene or high density polyethylene or a mixed resin of both. It is a composite resin composition for sheet molding.

The polypropylene in the present invention may be either homopolypropylene or block polypropylene. Suitable inorganic fillers include calcium carbonate, talc, mica, barium sulfate, metal powder, metal oxide powder, whiskers, and industrial by-products such as coal ash and blast furnace slag. Examples of the organic filler include wood powder, chaff, pulp, cellulose-based powder such as waste paper, and fiber. It is necessary that any of the fillers contribute to improving the rigidity of the resin. If the amount of the filler added is less than 25 parts by weight, combustion calories become high and bending workability becomes poor. Thirty
If it exceeds 0 parts by weight, it becomes a brittle material, making it unsuitable for bending.

For mixing the raw materials of the composite resin composition, various commonly known methods such as a tumbler mixer, a V blender and a high speed mixer can be used. The resulting mixture is melt-kneaded with a generally known melt kneader such as a single-screw, twin-screw extruder, Banbury mixer, etc. to obtain a composition, and T-die extrusion molding, calendar molding, etc. are generally known. A sheet having a thickness of 200 to 1000 μm is formed by a molding method. If the thickness is 200 μm or less, the rigidity becomes insufficient, and it becomes difficult to maintain the shape of the molded product in a used state. If the thickness is 1000 μm or more, the rigidity becomes excessive and bending of the sheet becomes difficult. The sheet obtained by using the composite resin composition of the present invention is not limited in shape and can be bent arbitrarily.

[0007]

EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. (Examples 1 to 11) Each of the following raw materials was used as a tumbler mixer.
, And then kneaded with a twin-screw extruder at 200 ° C.
The composition thus obtained was made into a sheet having a thickness of 400 μm using a T-die extruder. The sheet obtained was punched by forming a bending portion 3 and a punching portion 4 in the shape shown in FIG.
A desktop calender case 1 having the bent legs 2 shown in Fig. 1 was obtained and subjected to a heat resistance test. For other evaluations, sheets were cut out to give test pieces. The sheet manufacturing conditions are shown in Table 1 below.
The evaluation results are shown in Table 1-2. Raw material polypropylene: E-100 manufactured by Idemitsu Petrochemical Co., Ltd.
G High-density polyethylene: 520 manufactured by Idemitsu Petrochemical Co., Ltd.
B Polyvinyl chloride: HE7001 CaCO ₃ manufactured by Zeon Kasei Co., Ltd .: Particle size 10 μm Waste paper: Newspaper waste paper talc: Particle size 10 μm Coal ash: Particle size 15 μm

(Comparative Examples 1 and 2) Each resin was made into a sheet of each thickness with a T-die extruder and evaluated in the same manner as in the examples. The sheet manufacturing conditions are shown in Table 1 and the evaluation results are shown in Table 1.
It shows in Table-2. (Comparative Examples 3 to 4) The composition was manufactured and evaluated in the same manner as in the examples. The sheet manufacturing conditions are shown in Table 1 and the evaluation results are shown in Table 1.

[0009]

[Table 1]

[0010]

[Table 2]

In Table 1-2, "Orsen rigidity" is based on JIS K7104. “Heat resistance” was evaluated by checking the presence or absence of deformation when a table-top calendar case was placed upright on a gear oven at 80 ° C. for 30 minutes, and ◯ indicates no deformation,
X indicates that there is deformation. "Bending repulsion" is 20 x 100
The test piece cut out in mm is folded in two at the central portion in the long axis direction and the restoration property is evaluated. ◯ indicates a restoration angle within 90 °, × indicates 90.
Above °, XX indicates breakage by bending.

As can be seen from Table 1-2, the examples have good rigidity and heat resistance, small bending rebound, no odor during incineration, and low calories during combustion. On the other hand, in the comparative example, polyvinyl chloride is inferior in heat resistance, has a large bending resilience, and has an irritating odor upon burning. If the high-density polyethylene alone and the amount of the filler are too small, the rigidity and heat resistance are inferior, the bending resilience is large, and the calorie at the time of combustion is large, which is not preferable. If there is too much filler, bending causes breakage.

[0013]

The sheet produced by using the composite resin composition of the present invention has high rigidity and can be thinned, and the amount used can be reduced. In addition, since it has low heat resistance and bending repulsion, it enables the production of various products such as desk calendar cases that require bending processing, and even when it is discarded, no toxic gas is generated during combustion, so the environment is maintained. Conservation and low combustion energy extend the life of the incinerator.

[Brief description of drawings]

FIG. 1 is a development view of a desk calendar case.

FIG. 2 is a perspective view of a desk calendar case obtained by bending.

[Explanation of symbols]

 1 Desktop calendar case 2 Bending leg 3 Bending part 4 Punching part

Claims (2)

[Claims] 1. A composite resin composition for bending sheet, comprising 25 to 300 parts by weight of an inorganic and / or organic filler with respect to 100 parts by weight of propylene or high density polyethylene or a mixed resin of both. 2. The inorganic filler is calcium carbonate, talc,
In addition to mica, barium sulfate, metal powder, metal oxide powder, whiskers, it is an industrial by-product such as coal ash and blast furnace slug, and organic filler is wood powder, rice husks, pulp, waste paper and other cellulosic powders. The composite resin composition for bending sheet according to claim 1, which is a fiber.