JPH0727151Y2 - Blow molded hollow body - Google Patents

Description

[Detailed description of the device] [Industrial application] Blow molding made of highly rigid synthetic resin for furniture such as desks and drawers, various cases or automobile parts such as bumpers, dashboards, instrument panels, etc. The present invention relates to a hollow body, and more particularly to a blow-molded hollow body whose surface is hard to slip and has a soft feeling.

[Prior Art] Plastics are now widely used because of their excellent molding and chemical and physical properties such as rust resistance. In particular, as a substitute for metal, in addition to resins such as highly rigid polypropylene and high-density polyethylene among general-purpose resins, polycarbonate called engineering plastics, modified polyphenylene oxide, polybutylene terephthalate, blow molding hollow bodies of polyacetal are also available. It is being used.

[Problems to be solved by the invention] However, the blow-molded hollow body is required not only to have strength and rigidity that should be substituted for the metal in recent years, but also has a soft appearance and is hard to slip when placed, and Good wear resistance is required. This is because these products are touched by human eyes and touched by human hands, and therefore, a warm texture and a touch feeling are required.

Therefore, the present invention retains sufficient strength and rigidity as the whole hollow body, and has a warm rubber-like appearance and touch, and is soft, non-slip, and wear resistant. It is intended to obtain a blow-molded hollow body having good properties.

[Means for Solving the Problems] In order to solve the above problems, the present invention is configured as follows, which is formed by blow molding and is made of synthetic resin having a flexural modulus of 10000 kg / cm ² or more. In a molded hollow body, 3-10 with a modifier made of polyurethane containing a filler
This is a blow-molded hollow body characterized in that the surface of the hollow body is coated and molded with rubber diluted 0 times.

In the present invention, the synthetic resin having a flexural modulus of 10000 kg / cm ² or more is polypropylene, high-density polyethylene, polyamide resin, ABS resin, polyacetal, polycarbonate,
Blow-moldable resins such as modified polyphenylene oxide and polybutylene terephthalate can be preferably used.

The modifier is a mixture of two-component polyurethane having isocyanate as a reactant with respect to the filler in a ratio of 1: 2 to 1:30, preferably 1: 3 to 1:20. . As the filler, known fillers used as fillers for synthetic resins such as calcium carbonate, calcium silicate and clay can be used. This modifier is 3 to 100 times the rubber,
It is preferably used after being diluted 5 to 50 times.

In addition, before coating the surface of the hollow body with the above-mentioned rubber, it is possible to perform a primer treatment in order to modify the state of the surface of the hollow body.

[Operation] In the present invention, the hollow body is coated with a rubber diluted 3 to 100 times with a modifier made of polyurethane containing a filler, so that the hollow body has a rubber-like warmth. It has a soft texture and feel, and is soft and non-slip,
In addition, it is possible to obtain a blow-molded hollow body with good abrasion resistance, and since it is made of synthetic resin with a bending elastic modulus of 10,000 kg / cm ² or more, the rigidity of the hollow body is large and impact from the outside In contrast, a high-pitched sound can be absorbed and the tapping sound can be made into a high-quality sound with only a low tone. In addition, the reactivity of the polyurethane mixed in the modifier not only provides good adhesion of the hollow body to the synthetic resin, but also the addition of the filler makes it possible to obtain more appropriate tackiness and good feel. .

[Embodiment] An embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 is a desk which is an embodiment of the present invention, and comprises a top plate 2 and legs 3. The top plate 2 is formed by blow molding modified polyphenylene oxide into a hollow structure. The top plate 2 is composed of a structural member layer 4 and a rubber coating layer 5 covering the surface thereof,
The top plate 2 has a thickness of 30 mm, and the structural member layer 4 has a thickness of about 2.5 mm.
Is. The modified polyphenylene oxide used here is Noryl EBN9001 from GE Plastics,
Flexural modulus (ASTM, D790) is 21000kg / cm ² . The coating layer 5 reacts on the surface of the structure 4 formed by blow molding so that a diluent in which calcium carbonate and polyurethane are blended in a ratio of 1: 5 to 100 parts by weight of acrylic rubber can be applied. It is formed by spray coating a mixture of a water-soluble polymer and a solvent such as toluene. The wall thickness of the coating layer 5 is 0.1 mm to 1.0 mm, more preferably 0.3 mm to 0.6 mm.

When the top plate 2 was hit with a plastic hammer, high-pitched sounds were canceled by the covering layer 5, only low-pitched sounds remained, and a high-quality tapping sound was obtained. In addition, it feels tight when touched with your hand, especially when writing directly on a piece of paper and writing with a writing instrument, the tip of the writing instrument sinks due to its moderate elasticity, which puts a burden on the hand holding the writing instrument. It is possible to write beautiful characters because it has no resistance and has moderate resistance. In particular, when the writing instrument is a ball-point pen, the rotation of the ball is good and the way the ink is ejected is good.

In the above embodiment, the coating layer 5 was formed by coating after blow molding, but this coating layer may be formed by directly coating the parison during blow molding, or by forming a laminated parison by coextrusion, The surface of the hollow body may be coated by blow molding.

In addition, in the above-described embodiment, an example in which it is used for the top plate of a desk is shown, but when it is used for the case of an electronic device such as a word processor, by forming this coating layer on the contact surface with the device body, it becomes hollow. In addition to the double wall structure, it has the advantage of being formed into a shape according to the outer shape of the word processor to be housed, having a good appearance or feel, and preventing the rubber coating layer from peeling off. Third
The figure shows an example of use in the case of a word processor. In FIG. 3, 6 is a case for accommodating and holding the word processor 7. The case 6 is composed of a main body 8 and a lid body 9, and the main body 8 and the lid body 9 respectively have an outer wall 8a and an inner wall of the body.
8b and an outer wall 9a and an inner wall 9b of the lid. The rubber coating layer 11 is formed on the surface of the structural member layer 10 on the inner walls 8b and 9b,
It has a wall thickness of 0.5 mm to 2.0 mm. The case 6 is formed by blow molding, and in molding, the high-density polyethylene forming the structural member layer 10 is extruded into a tubular shape, and the semicircle of the circumferential shape of the surface forms the rubber coating layer 11. Acrylic rubber 100 parts by weight is coated with a diluent in which calcium carbonate and polyurethane are blended in a ratio of 1: 5 to form a parison, and this parison is sandwiched between split molds to apply pressure fluid to the parison. The case 6 is formed by press fitting. At this time, the rubber coating layer 11 is formed on the surface of the structural member layer 10 on the inner wall 8b and the lid 9b of the main body.
Set the position of the parison and the split mold. By integrally forming the structural member layer 10 and the rubber coating layer 11 as a Paris in this way, it is possible to provide a case that has a large adhesive force and is not peeled off by the contact of the stored items in the case. is there. Moreover, since the contact surface of the stored item has rubber elasticity, the cushioning property of the stored item is also good.

Further, in the above embodiment, the rubber coating layer 11 is formed on the surfaces of the inner wall 8b of the main body and the inner wall 9b of the lid, but the rubber coating layer may be formed by coating the outer wall 8a of the main body and the outer wall 9a of the lid. Is also possible. In this way, the case in which the rubber coating layer is formed on the surfaces of the outer walls 8a and 9a has a feature that it has a rubber-like feel and a touch feeling in appearance, and is soft and non-slip in use, and resistant to wear. It is characterized by good wear resistance.

Further, it is possible to form the coating on both the inner wall and the outer wall of the main body and the lid. With such a structure, a case having the above-mentioned effects can be obtained.

[Advantages of the Invention] Since the present invention is configured as described above, the hollow body has a high rigidity, and the blow-molded hollow body has a rubber-like warm feel and feel, and is soft and non-slip. In addition, it is possible to obtain a high-grade sound having good abrasion resistance, absorbing a high sound against an external impact, and making only a low hit sound. Further, the reactivity of the polyurethane mixed in the modifier not only provides good adhesion of the hollow body to the synthetic resin, but also the addition of the filler makes it possible to obtain more appropriate tackiness and good feel. .

[Brief description of drawings]

FIG. 1 is an overall perspective view of a desk which is an embodiment of the present invention, FIG. 2 is a sectional view of a main part of the same as above, and FIG. 3 is a sectional view of a case which is another embodiment. 1 ... Desk, 2 ... Top plate, 4 ... Structural member layer, 5 ... Rubber coating layer, 6 ... Case, 8 ... Main body, 8a ... External body wall, 8b ... Internal wall of main body, 9 Lid, 9a Lid outer wall, 9b Lid inner wall, 10 Structural member layer, 11 Rubber coating layer

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area B29K 105: 06 B29L 22:00

Claims (1)

[Scope of utility model registration request] 1. A flexural modulus (AS) formed by blow molding.
TM, D790) is a blow-molded hollow body made of a synthetic resin of 10,000 kg / cm ² or more, and a rubber diluted 3 to 100 times with a modifier made of polyurethane containing a filler is applied to the surface of the hollow body. A blow-molded hollow body characterized by being covered and molded.