JPS58189231A - Reinforced resin molding - Google Patents

Abstract

PURPOSE:The titled molding low in coefficient of thermal expansion and deformation during and after molding and excellent in abrasion and flexural strength, prepared by adding an aggregate prepared by curing a thermosetting resin solution containing wood flour into powder or particles to a thermoplastic resin and molding the mixture. CONSTITUTION:An aggregate, water content of 1-5%, is obtained by blowing wood flour into a cylinder while spraying a thermosetting resin solution on this wood flour and heat-curing the sprayed resin to vaporize wood vinegar and the contained water. Then, 3-50% this aggregate and, if necessary, a blowing agent (e.g., azodicarbonamide) are added to a thermoplastic resin material (e.g., PVC), and the mixture is molded.

Description

[Detailed description of the invention] This invention has a low coefficient of thermal expansion, and may be used during or after molding.
This invention relates to the provision of reinforced resin molded products with little distortion and excellent wear and bending strength properties.

The conventional method of strengthening resin molded products was to mix inorganic materials such as glass fiber and rock fiber, but it is now possible to give resin molded products a feel that is more similar to natural materials. For the purpose of keeping molding costs low, recent attempts have been made to incorporate wood flour or similar cellulose materials into materials such as polyvinyl chloride, polyethylene, acrylonitrile-butadiene-styrene, etc. It is.

Mixing the required amount of wood powder into the molding resin increases the strength and bending strength of the resin molded product by approximately twice that of the non-mixed resin molded product (7. (This product has extremely low strain rate after molding and has improved abrasion resistance, and is meaningful in terms of providing an ideal and inexpensive reinforced resin molded product.) .

However, despite the excellent properties of the molded product, the unique properties of the wood flour material contained in the product significantly reduced the molding properties of the resin, resulting in a relatively expensive product. .

That is, when wood powder is mixed in, the mixed wood powder itself or the fluidity of the molding resin material is extremely inhibited, and the frictional resistance against the inner wall surface of the molding machine cylinder or the sliding surface of the screw etc. is significantly increased. If a molding machine of d# is used, the moldability per unit time is reduced by %I.

This also causes wear and tear on the inside surface of the molding machine, reducing the useful life of the molding machine (this also causes excessive internal pressure on the die or mold surface, which can lead to breakage or wear of the die or damage or wear of the inside surface of the mold). Induction 1. At the same time, surface roughness of the molded product itself was induced.

In addition, in the conventional example, mixed wood powder generates a large amount of wood acid, acetic acid, etc. during heat molding, and this wood acid causes the molding machine cylinder, screw, die, inner surface of the mold, etc. In addition, in the previous method, contamination caused corrosion, which significantly reduced the frequency of use of molding machines, molds, etc., and also caused roughness on the surface of molded products. A large amount of steam was induced from the wood powder, etc., which adhered to the mold surface, causing problems with the surface roughness of the molded product and deterioration of the strength of the molded product.

In addition, the conventional method (in this case, the mixed wood powder and resin paulownia were completely integrated)
Forming voids, air bubbles, etc. on the peripheral surface of the powder A, causing stiffness in the molded product.
This significantly reduces the degree of

The reinforcing rod 1 resin molded product of the present invention was not devised in view of the inconveniences in the prior art, and it has the desired shape and dimensions, and is basically powder-like. Cutting or crushing a9. After adding a thermosetting resin liquid to the wood powder by spraying, impregnating or other methods, it is heated and cured.
It is produced from powdered or granular aggregate.

When using the aggregate produced in this way, the wood acid and moisture contained in the wood powder are gasified and evaporated during heat treatment, resulting in a neutral and extremely dry aggregate. In addition, since the frictional resistance of the aggregate itself has been extremely reduced, all the disadvantages of the previous examples mentioned above have been avoided, and the desired wood-like appearance has been achieved without molding distortion, and the appearance characteristics have been improved. It is intended to provide molded products with good bending strength properties [
7 things.

Hereinafter, a typical embodiment of the reinforced resin molded article of the present invention will be described in detail. Wood powder or similar cellulose material provided by cutting or crushing into powder or granules will be described below. On the other hand, spray thermosetting resin liquid or
．． Then, each particle is separated (at this point, it is heated and hardened to obtain the desired powder or granular aggregate).

In the molding of such aggregates, it is of course possible to blow raw material wood powder etc. into a cylinder and at the same time spray resin liquid onto the wood powder while heating and curing it. A method of blowing raw material wood powder impregnated with a fat solution into a heating furnace and heating it to harden it, a method of crushing the thus formed lump-like cured product with a roll, etc., or other appropriate methods are planned. It is what was done.

Kari 1. The ψ material that is molded is heated and hardened f3J!
At this point, the wood acid and moisture contained in the wood flour are gasified, and during the molding process (at this point, they are evaporated into the furnace).
11. Aggregates with a neutral moisture content of about 1 to 5% and particularly low surface friction resistance can be obtained. It is something that

This makes it possible to provide molded products of almost the same size using a normal molding machine without requiring excessive extrusion or injection pressure during molding, and This eliminates the risk of wear and tear on the molding machine cylinder, screw, die, mold, etc. caused by the generation of internal pressure in the molding machine.

That is, the aggregate provided on the slope is heated and hardened with a thermosetting resin material in the previous pretreatment, and the wood acid is removed in advance, and at the same time, the wood powder is This reduces the water content to about 1 to 5 grams, corrects moisture absorption after formation, and at the same time ensures a smooth surface and reduces frictional resistance, making it comparable to general aggregates. Similar molding properties are promised and are comparable.

The stone aggregate thus provided ranges from 3 to 50 cm, % to 30
This is a book in which a certain amount of wood powder is mixed into a PA plastic resin material such as vinyl chloride, polystyrene, ABSa resin, etc. and molded by injection or extrusion. The desire was for a molded product that would fit well and have the desired strength.

Similarly, when molding lightweight materials or moldings that require particular thickness, the thermoplastic resin may contain azodicarbonamide, azobisphonotomamide, azobisisobutyronitrile, barium azobifuformate, N, N' dinitroso N
, N' dimethyl terephthalamide and the like were planned to be mixed with a suitable blowing agent in accordance with the embodiment of the desired blowing 111M.

In addition, the aggregate used in the above process is a series of pretreatment processes such as heating, crimping, and curing of wood grains, wood powder, etc. to reduce the moisture content of the aggregate to about 1 to 5%. The inclusion of aggregate with such a low moisture content minimizes the generation of water vapor during molding, prevents roughening of the molding surface, and also prevents the formation of air bubbles. This is what I did.

The reinforced resin molded product according to the present invention has a unique configuration with an upward slope, and it is possible to provide a molded product having the above characteristics using the same molding method as in normal dark resin molding. %l, it is possible to provide a good molded product with a low coefficient of thermal expansion (fx) and less distortion due to changes in composition during and after molding.

In addition, its mechanical properties include strong bending strength, sufficient hardness, and excellent surface abrasion characteristics. <It was encouraged.

Furthermore, by incorporating wood-based materials into the material, it is possible to perform processing using ordinary woodworking machines and tools, and surface treatment with lacquer, paint, etc. This guarantees the unique color tone and feel of wood in molded products.

In particular, as a woodworking material, the entire cut surface exhibits wood-like properties, and unlike the conventional wood-like materials made by spraying, molding, or pasting of decorative sheets, it is a synthetic resin material. It has an effect that is not as noticeable.

l Samurai cup/offer person Ain Engineering Co., Ltd. Agent patent attorney Mulberry Hara, Minoru

Claims (3)

[Claims] (1) Add a thermosetting resin liquid to wood powder or similar cellulose material, heat it and harden it into a powder or particulate form, and mix in aggregate equivalent to 3 to 50 pieces of thermoplastic resin material. A reinforced resin molded product characterized by: (2) The addition is carried out by spraying a thermosetting resin liquid onto a blown wood powder or similar cellulose material (I). Molding. (3) The reinforced resin molded article according to claim 1, characterized in that the moisture content in the aggregate is 1 to 5%.