JPS5860054A - Production of fibrous molded body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] The present invention is applicable to insulation materials, sound absorbing materials, cushioning materials, base materials, construction materials such as tatami floors, packing plates, cushioning materials, and lining materials for automobile doors, walls, ceilings, etc. The present invention relates to a method for producing a fibrous molded product that has excellent properties such as elasticity, compression resistance, dimensional stability, water resistance, lightness, and workability, and is useful as interior material for vehicles, as well as insoles for shoes, etc. It is something.

Conventionally, fibrous molded products made by dehydrating plant fiber slurries made of wood fibers, waste paper pulp, hemp fibers, cotton fibers, etc. or a mixture of these fibers and molding them into board shapes or desired cube shapes have been used for eaves. Gutters are widely used as construction materials and various other industrial materials due to their excellent workability, heat insulation, sound absorption, and cushioning properties. This has the drawback of poor water resistance and dimensional stability due to significant strength reduction and dimensional changes such as elongation.

On the other hand, in order to overcome these drawbacks, these plant fiber slurries are mixed with fibrous materials of thermoplastic synthetic resin such as polyolefinic synthetic fibers, dehydrated and molded, and this is heated and pressed to form the above-mentioned A method has been used to improve the water resistance, dimensional stability, moldability, etc. of a molded product by bath-melting fibrous materials and bonding the fibers to each other. According to this method,
Synthetic fibers have less hydrophilicity than plant fibers, are weakly entangled with plant fibers, and cannot be expected to have bonding forces such as hydrogen bonds that bind the fibers together, so synthetic fibers must be melted to obtain the desired strength. Synthetic fibers or synthetic fibers and plant fibers are completely fused together and the entire molded body is cured, resulting in improved elasticity, combability, and breathability. However, there was a problem that workability etc. deteriorated.

The present invention has been made in view of the above-mentioned drawbacks and problems of the conventional art, and provides a fiber made by treating a fibrous material of thermoplastic synthetic resin with an elastic polymeric binder such as Uretasie 5 Stoma or SDR. The lump is subjected to a pulverization treatment such as buffing treatment or cardigator treatment to obtain a flocculent body of short fibers, and a composition is formed by mixing the flocculent body with wood fibers or vegetable fibers such as cotton & fiber. The object of the present invention is to provide a method for producing a string fibrous molded body having excellent elasticity as well as water resistance and dimensional stability by heating or heat pressing.

Next, the method for manufacturing the hardened W quality molded body of the present invention will be described in detail.

The plant fibers used in the present invention include wood fibers,
Grain pulp, kraft pulp, taracito pulp, hemp fiber, cotton fiber, etc. may be used alone or in combination.

On the other hand, as a fibrous material of thermoplastic synthetic resin, T0'
J continuous powder, polyester fiber, volupo-pileshi edge fiber, polysinged woven fabric, polyester fiber, polyvinyl chloride fiber, polyvinyl alcohol fiber, echyleshi-polyshi copolymer fiber, echyleshi-vinyl acetate copolymer fiber These may be used alone or in combination. These ms-shaped thermoplastic synthetic resins have a cutting length of l to IOCIm,
Desirably, the synthetic fibers have a diameter of 2 to 51 mm and have a thickness of 5 deniers or less, preferably 1.5 deniers or less, because they can be easily obtained by crushing into a floc-like body of short synthetic fibers, and the floc-like body and vegetable fibers can be easily obtained by crushing. This is preferable because it allows uniform mixing.

Before mixing the thermoplastic synthetic resin fibrous material with plant fibers, it is treated in advance with an elastic polymeric binder such as uretaceastomer or SDR to form a fiber mass, and then the fiber mass is pulverized. For example, a web is formed from the above-mentioned fibrous material, the web is impregnated with a urethane polyurea solution, and an elastomer is formed in the presence of moisture. The fibers are mutually bonded by coagulation, and then the waste is a mixture of synthetic short fibers and uretashi 5 stoma obtained by subjecting the fibers to a pulverization process such as WedzuV (ζ-Sashizuishiji treatment, Batsufuishig treatment, Cardigita treatment, etc.) A flocculent body is used.

As shown in the figure, such a flocculent body consists of a fibrous material (1) of a thermoplastic synthetic resin that is crushed into an elastic polymer binder (2) such as uretaceastomer at its intertwined portions by crushing with a crusher or the like. It is an accumulation of fiber masses (4) that are partially bonded together to form a porous three-dimensional structure. A flocculent body made of an accumulation of fiber lumps with a porous three-dimensional structure is created by breaking the fibrous material (1) into short fibers with a length of about 0.5 to 15 m, and bonding the fibers together. Since the fibers are also weakened, the degree of freedom of each fibrous material is increased, and together with the elasticity of the binder, it has excellent resilience against compression, imparting elasticity to the molded product, and Plant fibers such as wood fibers are easily entangled in the three-dimensional entangled portion, increasing the binding force between the fibers and improving the bending strength of the molded product.

The above-mentioned floc-like material may be specially manufactured in a factory, but it may be made of synthetic leather puff powder whose base fabric is a thermoplastic synthetic fiber non-woven fabric formed using uretashierastomer, SBR, etc. as a vigitator. It is also possible to use industrial waste (particularly in view of the current situation where these synthetic leather puff waste and sash tar waste are inevitably incinerated as they are difficult to reuse).
By using these effectively, it is possible to save resources.

Next, the cotton-like material is mixed with plant fibers such as wood fibers or cotton fibers and formed into a board shape or a desired three-dimensional shape by a wet or dry method. In addition, when mixing the above-mentioned cotton-like material with plant fibers, depending on the size of the cotton-like material and the state of separation, it is also possible to beat the fiber mass with a Peter etc. to improve dispersibility before mixing. good.

When making paper, there is no particular limitation on the mixing ratio of the above-mentioned cotton-like material and plant fibers, but it is recommended that the cotton-like material be mixed at a small ratio (both 5% (parts by weight) or more) to the plant edge ##. It is desirable to improve stability and water resistance, and for materials that require elasticity as well as a certain degree of strength and compression resistance, such as building materials such as flooring materials and tatami floors, and automobile interior materials, cotton is used. Mixing ratio of green body and plant fiber is 5~50850~
It is preferable to have a weight ratio of 95% because sufficient strength can be maintained due to the binding force such as hydrogen bonding of plant fibers, and it is also suitable for use in shoe insoles and sheet-like 3-sheet materials. etc., the mixing ratio of cotton and vegetable fibers should be
It is preferable to form the resin at a weight ratio of 0 to 95:5 to 50 in order to impart flexibility, and
In this case, the flexibility can be further improved by using mainly cotton fibers with long fiber length (good intertwining) as the plant fibers.The papermaking method may be either wet or dry, but the wet method This is preferable because the entanglement between the flocculent material and the plant fibers is promoted when the slurry is made into a portion and stirred in water.

On the other hand, when making paper using the dry method, it is sufficient to mix and deposit flocculent material and vegetable fibers and press them as they are, but if a thick material is to be formed, it is necessary to perform a needle-forming process, etc. Good too.

The composition obtained by mixing the flocculent material and the plant fibers in this manner is molded into a desired shape such as a board shape or three-dimensional shape, and then hot-pressed.

The temperature conditions for hot pressing should be such that the polymer binder that binds the fibrous material of the thermoplastic synthetic resin melts or heat softens.
Hot pressure is applied at about 60°C, and in the case of 81R, about 120°C. Further, at this time, the fibrous material of the thermoplastic synthetic resin may undergo thermal contraction.

That is, specifically, the melting point of the thermoplastic synthetic resin fibrous material is 215°C for NiOshi fiber and 170°C for VOLIPON fiber.
, since the polyester fiber is 130°C and the polychlorinated Pinyliza fiber is 180°C, by performing the temperature condition during hot pressing at a temperature higher than the melting point of the binder such as Urethashielastomer,
The fibrous material of the thermoplastic synthetic resin is heated to a temperature around its melting point, so that it softens or melts, causing thermal contraction at the same time as the binder melts.

Due to the heat and pressure treatment described above, the thermoplastic synthetic resin fibers solidify in a state entangled with the plant fibers, and phenomena such as some of the elastic polymer binder flowing between the plant fibers occur, which causes the entire molded body to It provides bonding strength and elasticity to the material.

In other words, if only synthetic fibers are mixed with plant fibers and melted, bonding between the synthetic fibers and the plant fibers such as wood fibers and bonding force between the synthetic fibers will occur, but the fibers will not be uniformly dispersed. However, according to the present invention, the thermoplastic synthetic resin fibers are partially bonded together using an elastic polymeric binder. Since it is bonded to the plant fibers inside the molded body, it exhibits elasticity, giving the molded body cushioning properties, cushioning properties, elasticity, etc.

Several examples of the method for producing a fiber molded article according to the present invention will be shown below.

Example 1 A three-dimensional entangled mat made of a synthetic fiber web made of a mixed spun yarn of polyester fibers and polystyrene fibers, and dimethyl dimethyl polyurethane! After being impregnated with the uretashira 5 stoma, the uretashiera 5 stoma is immersed in water to coagulate in the unbounded mat, which is then subjected to cardigator treatment and pulverized to form a porous waste fiber bonded by the uretashier 5 stoma. A flocculent body is formed, and the flocculent body is beaten with a piter and mixed into a slurry of wood fibers so that the ratio of wood fibers and flocculent body is 60:40 parts by weight, and a mixed slurry is prepared. None, this is made into a paper, dehydrated with a dehydration press, and then placed in a dry oven at 140°C to 200°C.
A plate-shaped fibrous molded body having a thickness of 100 mm and a specific gravity of 0.28 was obtained by heating and drying the mixture through the inside.

As a result of measuring the coefficient of water absorption linear expansion of the fibrous molded product obtained in this way, 30°C, 50% volume, 48 hours → 30°C, 951
(2) Under the 48-hour condition, the specific gravity was 0.21, which was 40% smaller than the 0.39 for a fiberboard with the same specific gravity made only of wood fibers.

In addition, when the above molded body was left for 24 hours with a compressive force of 7 Y4/ear applied and the thickness recovery rate was measured 5 hours after unloading, 96% recovery was observed, and 99% in 24 hours. %
In the molded body made only of wood fibers, it was possible to reach 81% in 5 hours and 81% in 24 hours.
Although the recovery rate is only 5%, it has excellent elasticity. Furthermore, when the restoration rate was similarly measured under the humidity condition of 95% RJ, there was almost no decrease in the restoration rate with the production method of the present invention, whereas the wood fiber Approximately 1 for a molded body made of
There was a 0% reduction in recovery rate, and the product according to the present invention had significantly improved water resistance, and had excellent elasticity and compression resistance as a heat insulating base material for tatami floors or floor covering base materials. .

Example 2 A flocculent material (puff powder) obtained by buffing a synthetic leather made of composite spun yarn of polyester/styrene as a base fabric and bi-cedar made of silicate sierastomer as a bi-cedar was made into cotton fibers (dropped cotton).
The mixture was mixed at a weight ratio of 75:25, and this was simultaneously dispersed and beaten in water using a peter to prepare a mixed slurry. After drying, a plate-shaped molded product having a specific gravity of 0.3 and a thickness of 1 0cm was obtained.

The molded product thus obtained was excellent in flexibility as well as water resistance, elasticity, and dimensional stability, and had shock absorbing power as a board or cushioning material equivalent to packaging.

Example 3 The molded body obtained by the method of Example 2 was further heated at 173°C and 17
Heating and pressing for 90 seconds under the conditions of 11/aJ until the specific gravity was 0.
A highly flexible, medium-density sheet material with a thickness of 5 m1 was obtained.

This sheet-like molded product had sufficient elasticity, flexibility, and water resistance to be used as a core material for covers, sagittals, slippers, and the like.

Example 4 The molded body obtained by the method of Example 2 was further heated at 190°C and 50°C.
The plate was heated and pressed for 120 seconds under the condition of 'l/crl to obtain a hard and flexible plate having a specific gravity of l, 0 and a thickness of 3 m.

This hard molded product can be used as an elastic core material for shoe insoles or mid-sized shoes, and can also be used as the back plate of speakers, +Sepinet, etc. because it has soundproofing and vibrationproofing effects. there were.

Example 5 According to Example 2: The board-like molded product obtained was hot-press molded between male and female molds heated to 170"C, and the drawing depth was 5 CIl.
When molded into a dish-shaped cubic molded body (specific gravity: 0.6, thickness: 5 ms), no cracks occurred, and it also had moderate elasticity, making it suitable for construction materials such as three-dimensional wall coverings, or for automobiles. It could be used for door trims, tray-shaped packaging boxes, etc.

As described above, in the present invention, a fiber mass obtained by treating a fibrous material of a thermoplastic synthetic resin with an elastic polymeric binder such as Uretashi 5 Stoma or 8BR is subjected to a pulverization treatment such as a buffing treatment or a carding treatment. A composition obtained by mixing the floc-like body with plant fibers such as wood fibers or cotton fibers in an appropriate ratio is formed into a desired shape by a wet or dry method, and then Heat or heat press to melt polymer bond +3 and make specific gravity 0.2-1.2
Since this method relates to a method for manufacturing a fibrous molded body characterized by forming a molded body, fibers and shaped objects of thermoplastic synthetic resin are scattered inside the molded body, and uretaceous material is formed inside the molded body. A large number of small elastic bodies made of polymer materials such as 5-stoma and 81R are formed, which gives it elasticity, dimensional stability, water resistance, and excellent elasticity.
It is possible to obtain a fibrous molded body that exhibits cushioning properties, compression resistance, and restorability.

Also, even when the molded body is compressed to a high density, wII#
Because the elastic polymer binder is present in the intertwined parts of the
Even if the synthetic resin fibers are melted and densified by heating, the elastic polymer binder prevents the synthetic resin fibers from completely slipping, preventing N-crossing and imparting flexibility. It does not have the rigidity of conventional products mixed with wA fibers,
It is possible to form a molded body having workability and cushioning properties.

[Brief explanation of the drawing]

The drawing is an explanatory view showing the intertwined state of the fiber mass T constituting the flocculent body according to the manufacturing method of the present invention. (1)... Fibrous material of thermoplastic synthetic resin, (2)...
- Elastic polymer binder, (4)... fiber mass. Patent applicant: Daiken Kogyo Co., Ltd.

Claims (1)

[Claims] ■ A fibrous mass obtained by treating a fibrous material of a thermoplastic synthetic resin with an elastic polymer binder such as uretacelastomer or SBR is subjected to a crushing treatment such as a buffing treatment or a carding treatment. A composition obtained by mixing the floc-like body and plant fibers such as wood fibers or cotton fibers in an appropriate ratio is molded into a desired shape by a wet or dry method (7). A method for producing a fibrous molded article, which comprises subsequently heating or hot pressing to melt the polymer binder to form a molded article having a specific gravity of 0.20 to 1.2. (1) The scope of claims characterized in that the fiber mass is made of powder of synthetic leather whose base fabric is a thermoplastic synthetic fiber nonwoven fabric formed using uretacelastomer, SDR, etc. as a binder! A method for producing a rod fibrous molded body according to Section J1.