JPS6073806A - Method of molding woody synthetic molded item - Google Patents

Abstract

PURPOSE:To make possible arbitrary shaping, by drying broken tip material or pulp material so the water content therein may be within a specified value, subjecting the material within a specified temperature range to heating and drying and to breaking and granulating operation, which renders the pH value neutral. CONSTITUTION:A cellulosic material such as broken tip material, pulp material, etc. is heated and dried so that the water content therein may be up to 15%. This drying process causes the texture of the fibers constituting the material to be broken thereby the cellulose is broken up. When an emulsion type urea resin adhesive liquid is added to the material, the material is well impregnated with the urea resin adhesive liquid. Then the material is heated and dried at a temperature in the range of 100-150 deg.C and is subjected to breaking and granulating operation to produce a fine powder having a particle diameter on the order of 100-150 mesh. In this course, the pH value of the material itself becomes in the range of 6-7. The molded item of said material is rich in woody feeling, excellent in water resistance, abrasion resistance and impact resistance, and high in surface hardness.

Description

Detailed Description of the Invention This invention involves mixing comparatively fine wood powder with an adjusted pH value into a synthetic resin material such as vinyl chloride resin as a molding aggregate, and press molding, extrusion, injection molding, etc. The aim is to provide a composite piece of wood that combines the features of wood and resin.

One of the main objectives expected in the present invention is to improve the molding properties by imparting characteristics to the mixed wood flour aggregate, and to reduce the wear and tear of a part of the extrusion or injection cylinder during molding. It eliminates inconveniences such as breakage of ties and roughness on the surface of the molded product, and improves the compatibility between the mixed aggregate and resin material to provide a composite molded product that does not generate cavities on the surrounding surface of the aggregate. is δ.

Next, one of the other objects expected in the present invention is to
By giving characteristics to the mixed wood powder aggregate, it is possible to mix it into the molding work surface as well as the molding resin material's conforming surface, which results in less distortion due to cooling shrinkage and less distortion.
The aim is to provide a synthetic molded product that is free from warping, cracking, etc., has an elastic modulus more than three times that of ordinary vinyl chloride molded products, and has a sufficiently hard surface.

Furthermore, one of the other main objectives anticipated in the present invention is to press, extrude, and
Alternatively, it can be easily mass-produced and provided by molding it into any shape by injection molding or the like.

Another main objective of the present invention is that it has superior abrasion resistance compared to the characteristics of the material to be molded, has no shrinkage due to molding shrinkage, and is more durable than wood in actual use. The aim is to provide a composite carving that has the same surface characteristics as the original, i.e., color tone, texture, and can be painted, bonded, laminated, etc.

The method of forming a composite piece carving according to the present invention is intended to achieve various effects for various purposes on the diagonal. The means are predetermined.

Next, a typical method for forming a composite piece for building materials or fittings according to the present invention will be explained in detail.

First, the materials to be prepared are vinyl chloride, ABS resin,
These are a thermoplastic resin material such as polystyrene, a mixed aggregate based on wood flour, and a calcium carbonate powder hardening agent, stabilizer, coloring agent, etc. that are added as necessary.

The thermoplastic resin material to be used is determined based on selection criterion A, satisfying the various needs required for molded articles.
Vinyl chloride resin is commonly used in building materials, fitting materials, etc. due to its molding properties, appropriate strength and hardness of molded products.

The aggregate used was then neutralized using the following procedure. That is, a cellulosic material such as crushed chip material, pulp material, or rice husk is prepared and subjected to a drying process, especially a heat drying process, to reduce the moisture content of the material to 15%.
It has been pre-processed so that it is within Along with the drying process, as the moisture content in the material decreases to less than 15, the fiber structure of the material is rapidly destroyed,
The composition of the cellulose in not only rough bundles or lumps of cellulose but also pulp material and rice husk is destroyed, and the cellulose is separated.

An emulsion type urea resin adhesive is applied to the material which has dried and the structure itself has collapsed,
By leaving it for 20 to 30 minutes, this urea-based resin adhesive liquid is sufficiently impregnated into the material, and its pH value is usually about 5.

Incidentally, attempts were made to separately add ammonia chloride or hydrochloric acid as a hardening agent to this resin adhesive liquid, depending on the material.

In this way, the material impregnated with the urea-based resin liquid and cured is subjected to heat drying at a temperature of 100 to 150°C and crushing into powder in the next step. The water content is within 3 to 5%, as close to 0% as possible, and the particle size is about 100 to 150 mesh.

During such heat drying and crushing, the pH value of the material itself is within the range of 6 to 7, and is generally adjusted to be neutral.

The neutralization treatment of the acidic material at the starting point depends largely on the action of the urea-based resin adhesive that is interposed during the process, and the addition of the urea-based resin adhesive is necessary. In unplanned simple heating and drying treatment of cellulose-based materials, the pH of the starting point material becomes 2 to 3, compared to the pH of the starting point material, which is 2 to 3, and conversely, the P)I value increases. It tends to be acidic. On the other hand, by interposing a urea-based resin adhesive, the material with a pH of 5 is neutralized while gradually releasing the acetic acid contained in the material as wood acid scum as it is heated and dried. The P)I of the material is adjusted to within the neutralization range of 6 to 7.

The aggregate thus provided is heat-treated during processing to reduce the water content in the aggregate to a maximum of 13%, ideally 3 to 5%, and even as much as possible to 0%.
In the subsequent resin molding with aggregate mixed in, there is no room for water vapor to be generated, and the wood acid contained is prevented from disassociating and volatilizing, eliminating any room for acidic scum to be generated, and is sufficiently neutralized. Its pH value is 6-7.

In addition, the aggregate used is the shape of aggregate tnj, that is, the form of wood chips or pure wood powder, as well as the heating drying in the molding process of pulverization of the aggregate. Appropriate drying means were studied to reach the degree of drying that is separately required in the form of aggregates or formed granular aggregate.

In the aggregate provided by calyx, the above-mentioned urea-based resin is used as the upper body, and wood acid contained in the wood flour, especially acetic acid gas, is /'A' Therefore, it is neutralized and effectively reduces the possibility of acidic scum forming in the aggregate used in the subsequent processing of molding the aggregate into a resin material.

In addition, most of the moisture contained in the aggregate is evaporated due to the excessive heating and drying applied during molding of the material, and the formation of water vapor, which is a problem in resin molding using molding materials. This eliminates the possibility of foaming, cavities, rough skin, etc. occurring in the J-molded product. In addition, the removal of this water content can have a significant effect on the amount of wood acid contained in wood flour, and the wood acid contained in wood flour is usually converted into H2O.
Since it dissociates and dissipates only after reacting with the group, this can be effectively suppressed. Therefore, in addition to erasing the wood acid produced in the heat crushing-hardening process by impregnating the thermosetting resin material and adjusting the pH to 6 to 7 by neutralization, it is possible to suppress the generation of residual wood acid gas from the aggregate. This makes it even more effective.

The effective elimination and prevention of wood acid gas generation in such aggregates has an extremely important meaning in subsequent resin molding. In other words, if wood acid gas is generated during resin molding, the inner wall surface of the cylinder screw, molding guide, or metal hole (1) of the injection machine, extruder, or injection machine used for resin molding may The oxidized layer f+! extremely reduces its service life and also reduces its molding efficiency, causing the problem of molding defects especially due to extrusion and injection pressure.

In addition, unlike ordinary pure wood flour, the surface resistance value of the aggregate is extremely reduced due to the impregnation or 1j4 of a chromatinized resin in the aggregate. As a result, the extrusion and injection pressure in the case of adult molding in a resin material is almost close to that of a general resin. On the other hand, in the past, the mixing of wood flour caused friction resistance when the wood flour came into contact with the inner peripheral surface of the shilling and the Gui hat. In some cases, the inner circumferential surfaces of the cylinder and die cap are scratched, worn, or damaged.

Furthermore, the use of such aggregates ensures good compatibility with the flt resin material, ensures uniformity of the aggregate, and prevents the aggregate from occurring on the same surface in the molded product. Eliminate as much of the void as possible,
This makes it possible to provide molded products with the desired quality.

TiRM Calcium J1 Powder, which is then used and removed, prevents deformation of the molded product during extrusion processing and the like. C1(;4
Since calcium itself is particularly cheap, it was used whenever necessary to set the Qj value of molded products to a low value.

Prepare stabilizers such as lead separately for each material and mold)
``This is a separate attempt to prevent deterioration in a single product and to reduce as much as possible the frictional resistance that occurs during extrusion processing.

Furthermore, for molded products? If the color is to be colored, a corresponding coloring agent should be prepared. For example, if the color is to be white, 4F of titanium chloride should be prepared.

The materials described in detail above can be mixed in advance with a resin material such as vinyl chloride resin and provided in the form of pellets, or mixed into powdered resin such as vinyl chloride resin. It may be provided as
It is selectively supplied and used depending on the type of resin molding machine used.

Therefore, when making pellets, first, mix the above-mentioned aggregate within 50 wt% with powdered resin, add J&M calcium as necessary within 10 wt%, and then add The required stabilizers, lubricants and colorants are mixed and kneaded and heated to obtain pellets for molding.

Using the molding pellet thus obtained, the desired composite carving was obtained using the same method as in ordinary resin molding.

Other methods that will be planned next include a method similar to pellet production, in which various materials are put into a molding machine to directly obtain a molded product, kneaded, and molded by heating. Since the above-mentioned aggregate mixing is planned, the main molding methods for the resin molded products are generally press molding, extrusion molding, or injection molding, and extrusion foam molding is partially planned. It is.

In addition, the amount of aggregate to be added was determined according to the R method of resin molding and the characteristics of the molded product, and the amount of aggregate to be added was 20%.
This was determined within the range of about 50%.

In addition, depending on the resin material used, the aggregate size, the molding method, etc., the processing temperature is within the range of 110°C to 170°CJ'r'', in order to achieve specific effects on the various properties listed in i]j. It was possible to provide a composite piece that combines the advantages of wood and brass tink.

In particular, we aim to provide molding of various molded products, which in the past have been considered almost impossible to mold due to the fact that the wood powder mixed in with the wood powder produces wood acid scum, or that the slip resistance of the wood powder is particularly high. It could have been done easily.

In addition, due to the characteristics of the Majin aggregate, the molded product is compatible with the resin material used, and the resin molded product with good quality characteristics can be provided using normal molding methods and normal molding efficiency. It could have been done.

In addition, due to the characteristics of the aggregate, it does not induce excessive frictional resistance, cylinder damage, etc. in the molding machine itself;
Roughness of the inner circumferential surface of the inner circumferential surface is also prevented, and the wear rate of the equipment used is particularly reduced.

As mentioned above, the molded product thus provided is said to have a woody feel, water resistance, abrasion resistance, shock viscosity, and surface hardness.

It also reliably prevents molding distortion due to sink marks and the like during the process of growing cedar, as well as post-molding distortion, warping, cracking, etc., and has a particularly good elastic modulus.

It also has a low thermal deformation rate, and has good machinability, paintability, adhesiveness, nailing properties, etc., and is said to have particularly good construction properties.

In addition, the wood used is 31 leaves and 1 broad leaf, as the cellulose fibers are made into fine short fibers, that is, fine powder, without crushing the wood. 1)
It is something.

The molding method of the wood-like annual shape according to the present invention consists of a diagonal assembling method, and the actual molded products are used as architectural members, such as door frames, window frames, surrounding edging materials, skirting boards, and curtains. Box, edge, angle, tenure, flooring, walling, sill, 1
1!1 houses, doorstops, etc., as well as fittings such as shoji frames, doors, doorways, louvers, etc. for other houses, p rivers, automatic streams, etc.
It is planned to be used in a wide range of applications, including ships, home appliances, various cabinets, sinks, and more.

Claims (2)

[Claims] (1) Dry crushed chips, pulp, rice husks, and other appropriate cellulose-based materials so that the moisture content of the materials is within 15% to induce collapse of the fibrous structure, and The processed material is impregnated with a urea-based resin liquid, and then the processed material is heated at 100°C to 150°C.
A process of drying and crushing in a temperature range of C and molding neutralized fine aggregate with a pH of 6 to 7; mixing this neutral fine aggregate with vinyl chloride or other thermoplastic resin; and molding the neutralized fine aggregate with an appropriate molding method. A method for forming wood-like composite pieces, which is characterized by a forming process. (2) A method for forming special carvings, characterized in that the aggregate particle size is 100 mesh or more and the water content is 5% or less.