JP2000153511A - Plate-like molding containing recovered paper as main component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a molding utilizing recovered paper useful for a buffer material, a heat insulator, a soundproofing fire resistant material or the like obtained by molding a recovered paper molding material containing the recovered paper and a phenol resin as main components and containing phenol resin. SOLUTION: The plate-like molding comprises recovered paper and a phenol resin as main components and further recovered paper molding material containing a phenol resin including an inorganic filler as desired and molded under the conditions of a molding pressure of 20 kgf/cm2 or below, 160 to 170 deg.C and a molding time of 120 to 90 sec/mm and at least a bending strength of 30 kgf/cm2, a density of 0.3 to 0.8 g/cm3 and a thermal conductivity of 0.1 kcal/m.hr. deg.C or below.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article using waste paper, and more particularly, the present invention is obtained by molding waste paper molding material containing waste paper and a phenolic resin as main components and containing a phenolic resin. The present invention relates to a plate-like molded product containing waste paper as a main component.

[0002] The molded article according to the present invention has a good appearance and can be used as a cushioning material, a heat-insulating and fire-proofing material or a sound absorbing material in the field of building materials and the like. The used paper used in the production of the molded article of the present invention and the used paper molding material containing a phenolic resin as a main component and containing a phenolic resin (hereinafter sometimes referred to as a used phenolic resin-containing used paper molding material) have good moldability. And can be easily formed by hot pressing at a low pressure. Further, the present invention is inexpensive because the used paper can be used as it is without using an alkali treatment or deinking treatment when the used paper is used as a pulp raw material. Useful for resource utilization.

[0003]

2. Description of the Related Art Conventionally, a method for producing a wood-based board such as a fiberboard is a method in which a fiber is defibrated into a floc in water, dewatered, and treated with a resin.
Or, without performing the resin treatment, a method by the so-called wet method of forming into a board shape, and a dry method of heating the resin after mixing the resin with waste paper pulp or a mixture of waste paper pulp and fibers obtained by fibrillating waste paper. There is a way.

In recent years, it has become urgent to reuse and effectively use a large amount of used paper from the viewpoint of resource saving and environmental protection, and various methods of recycling used paper are being studied. As a method of reusing a large amount of waste paper, for example, there is a method of using as a raw material of a buffer material or a buffer board. In this case, there is a buffer molded article such as an egg pack case by a so-called wet method in which waste paper is defibrated with water by a refiner to form waste paper pulp, which is formed and dried with a mold.

[0005] A used paper board is known which is used as a buffer material or the like obtained by mixing a used paper pulp obtained by disintegrating used paper with a refiner with a thermoplastic resin fiber such as a polyolefin resin fiber, forming a web, and then heating and press-molding the web. (For example, Japanese Patent Application Laid-Open Nos. 9-1513, 9-19907, 9-22070
9). Also, a method of adding synthetic pulp to waste paper, mixing and defibrating with a refiner or the like, forming a sheet, and pressing the sheet by hot pressing to form a sheet-shaped molded product (for example, Japanese Patent Publication No. 52-20588). Is mixed with a thermosetting resin, and then heat-molded to form a molded product such as a pallet (see, for example,
6-41142).

[0006] As described above, various methods for recycling waste paper and products that have been recycled have been reported. However, a wet paper pulp that has been fibrillated with water by a so-called wet method is formed and dried in a mold or the like. This method is mainly used for cushioning materials, sound absorbing materials, heat insulating materials and the like. As methods for improving the disadvantages of the wet method, Japanese Patent Application Laid-Open Nos. 56-41142, 9-1513, 9-19907 and 9-220709 by the dry method have been reported. These are obtained by blending fibers of a thermoplastic resin, a thermoplastic resin, or the like with waste paper pulp to improve the buffering defect and mechanical strength when only waste paper is used.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a low-density waste paper having mechanical strength and heat insulation performance comparable to those of a conventional buffer material such as styrene foam, a heat insulating material, and a fire-resistant material. This is to provide a molded article that has been used.

[0008]

According to the present invention, waste paper such as newsprint is cut into a predetermined size, and the waste paper is defibrated and pulverized by a high-speed rotary stirring mixer while adding water or a solvent thereto. A phenolic resin and other additive components are added to this, and a wastepaper molding material containing a phenolic resin containing a wastepaper obtained by chipping while maintaining a specific temperature and a phenolic resin as main components, The present invention relates to a plate-like molded product that is compression molded under low pressure.

[0009]

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to 90 to 51 parts by weight of waste paper,
A phenolic resin-containing waste paper molding material containing 10 to 40 parts by weight of a phenolic resin as a main component and further containing 0 to 39 parts by weight of an inorganic filler is molded at a molding pressure of 20 kgf / cm ^2.
It is a plate-like molded product obtained by molding under the following low pressure at a temperature of 160 ° C. to 170 ° C. and a molding time of 120 seconds / mm to 90 seconds / mm, and has a bending strength of at least 30 kgf / cm ^2. The present invention relates to a plate-shaped molded article mainly composed of waste paper having a density of 0.3 to 0.8 g / cm ³ and a thermal conductivity of 0.1 kcal / m · hr · ° C. or less.

[0010] The waste paper molding material containing a phenolic resin used in the production of a molded article based on waste paper of the present invention is produced as follows.

That is, to 90 to 51 parts by weight of waste paper cut into a size of 3 mm × 3 mm or less, the waste paper is defibrated and pulverized by a high-speed rotary stirring mixer while adding at least the same amount of water or solvent as the waste paper weight. Then, 10 to 40 parts by weight of a phenolic resin, a pigment, a release agent and an inorganic filler 0 to 10 parts by weight.
While adding 39 parts by weight and, if necessary, a curing agent, a flame retardant, and the like, with stirring, the mixture is maintained at a temperature of 40 ° C. or lower to form chips, and the obtained chips are dried at a temperature of 80 to 100 ° C.

The amount of waste paper in the phenolic resin-containing waste paper molding material used in the present invention is generally 90.
５１51 parts by weight, preferably 85-55 parts by weight. If the amount of used paper is too large to exceed 90 parts by weight, good moldability cannot be obtained due to poor moldability, and a molded article having insufficient strength and good appearance can be obtained. I can't. On the other hand, if the amount of waste paper is less than 50 parts by weight, the density of the molded article increases, and the cushioning property decreases.

The phenolic resin is used in an amount of 10 to 40 parts by weight, preferably 15 to 35 parts by weight. When the use ratio of the phenolic resin is less than the above range, the resin is poorly dispersed, so that it is difficult to produce a material, and a good molding material cannot be obtained. When the proportion of the resin is large, it is difficult to obtain a molding material having a uniform shape, which is not preferable. Therefore, it is preferable that the use ratio of the phenolic resin is within the above range.

In the present invention, an inorganic filler is further added to the above-mentioned phenolic resin-containing waste paper molding material, if desired, and the addition of the inorganic filler can impart flame retardancy to the molded article. If the amount of the inorganic filler is too large, not only is the moldability deteriorated, but also the strength of the molded product is reduced and the density is increased, which is not preferable. Therefore, the amount of the inorganic filler is at most 39 parts by weight or less, generally about 20 parts by weight, usually 15 to 2 parts by weight.
Used in the range of 5 parts by weight.

[0015] The production of plate-like molded products mainly composed of waste paper is as follows.
The above-mentioned chip-shaped or flake-shaped phenolic resin-containing waste paper molding material is molded at a molding pressure of 20 kgf / cm ² or less.
Usually 20 to 5 kgf / cm ² , preferably 15 to 5 kg
It can be obtained by compression molding at a low pressure of f / cm ² at a molding temperature of 160 ° C. to 170 ° C. and a molding time of 120 seconds / mm to 90 seconds / mm.

The plate-like molded product thus obtained is
Exhibit a bending strength of at least 30 kgf / cm ² or more,
When the thermal conductivity is 0.1 kcal / cm ² or less and the density is 0.1 kcal / cm ² .
It is ³ to 0.8 g / cm ³ , and has performance comparable to buffer materials such as styrene foam and heat insulating materials.

The used paper used in the production of the plate-shaped molded article of the present invention is not particularly limited as long as it is a pulp fiber. Newspaper, magazine, book, envelope, wrapping paper, copy paper, computer, etc. High-quality paper, such as embossed paper, and cardboard paper.

In preparing the phenolic resin-containing used paper molding material of the present invention, the used paper is cut into a size of 3 cm × 3 cm or less in advance by a cutter or the like before use. When the size of the waste paper is large, the waste paper is difficult to be defibrated in the high-speed rotary stirring mixer, and the mixing with the resin is uneven and the impregnation of the resin is insufficient. It is difficult to obtain a good material, the moldability is poor, and a molded article having a good appearance cannot be obtained.

When the used paper is defibrated and pulverized by a high-speed rotary stirring mixer, water or a low-boiling-point solvent such as methanol or ethanol, which is commonly used for phenolic resins, is used. And has the effect of assisting the defibration of waste paper. However, when an excessive amount is added, waste paper is in a dango state, the dispersion and mixing of the resin are not uniform, the resin impregnation is insufficient, and a long time is required for drying, and a good molding material cannot be obtained. .

The amount of water or solvent used is determined in relation to the amount of oil absorption (resin absorption) of the used paper. In practice, however, the disintegration of used paper should be at least approximately the same amount (parts by weight) of the used paper. The required amount is determined while observing the state of the condition. Therefore, the amount of water or solvent used (the amount added) is actually dependent on the amount of used paper and / or the quality of the used paper, particularly the amount of oil absorption. weight)
The same amount or more is used. If the amount of water or solvent used is less than the amount of used paper, the used paper is not sufficiently defibrated and a good molding material cannot be obtained.

The phenolic resin used in the present invention comprises:
As described above, in a high-speed rotary stirring mixer, after adding a required amount of water or a solvent to waste paper cut into a predetermined size and fibrillating and pulverizing the waste paper, then adding a required amount of a phenolic resin. Mixing is performed while maintaining the temperature at 40 ° C. or lower to form chips. In this case, a high temperature exceeding 40 ° C. is not preferable because the resin of the chip is easily formed and solidifies easily. Usually, 30 to 40 ° C. is applied. The chipped mixture is dried by a dryer such as a hot air circulation dryer at a temperature of about 90 ° C., usually 80 to 100 ° C., until a target flow value (60 mm to 80 mm by a parallel disk method) is reached. The time required for this drying is usually about 90 minutes. When the drying temperature is low, the time required for drying becomes long, which is not preferable in the work operation. On the other hand, when the drying temperature is high, the dispersion of the drying tends to occur, which results in poor appearance of the molded product, which is not preferable.

The phenolic resin used in the present invention comprises:
An aromatic compound having a phenolic hydroxyl group, specifically, a phenolic compound such as phenol, cresol, xylenol, alkylphenol, and resorcinol, and an aldehyde such as formaldehyde, acetaldehyde, paraformaldehyde, furfural, and cyclic formal. A phenolic resin obtained by a condensation reaction in the presence of a catalyst or an alkaline catalyst, or a modified resin of these resins, and further subjected to a co-condensation reaction with another thermosetting resin such as an epoxy resin or an amino resin. Examples of the resin include a resin, a thermoplastic resin, and a polymer alloy with another thermosetting resin. Generally, a phenolic resin such as a so-called phenolic resin is used.
These phenolic resins usually have a solid concentration of 60 to 80.
% (Weight) used in liquid form.

The inorganic filler used in the present invention comprises:
For example, clay, talc, calcium carbonate, calcium silicate, calcium hydroxide, mineral fibers (for example, NIX manufactured by Nitto Boseki Co., Ltd.) and the like are exemplified.

The high-speed rotary stirring mixer used for preparing the phenolic resin-containing waste paper molding material of the present invention is a mixer having a rotating blade inside and capable of controlling the temperature, for example, a Henschel mixer. , Super mixers and the like.

[0025]

Examples of the present invention will be described below. Unless otherwise specified in the examples, "parts" refers to parts by weight, and "%" refers to% by weight.

Example 1 Newspaper 8 cut into a size of 2 cm × 3 cm by a cutting machine
To 90 parts of water, 90 parts of water is added, and the newspaper is defibrated and pulverized with a Henschel mixer.
While adding 1 part (resin concentration 70%), 1 part of carbon black and 1 part of zinc stearate, a chip was formed at a temperature of 30 ° C. The obtained chip-shaped mixture is dried for 90 minutes with a hot air circulating drier at 90 ° C., and the flow value is 70c by a parallel disk method.
m of chip-shaped waste paper molding material containing phenolic resin was obtained. This molding material was molded at a molding pressure of 15 kgf / cm ² , a molding temperature of 160 ° C., and a molding time of 90 seconds / mm to a thickness of 6 m.
m were molded. Table 1 shows the physical properties of the molding material and the molded article.

Example 2 70 parts of corrugated cardboard, 70 parts of water instead of 80 parts of newspaper, 30 parts of novolak type phenolic resin instead of resol type phenolic resin (including a 70% resin concentration methanol solution and 3 parts of hexamine) ) Was used in the same manner as in Example 1 to obtain a chip-shaped waste paper molding material containing a phenolic resin having a flow value of 75 cm by a parallel disk method. This molding material is molded at a molding pressure of 7 kgf / cm ² and a molding temperature of 170.
A flat molded product having a thickness of 6 mm was molded at a temperature of 105 ° C. and a molding time of 105 seconds / mm. Table 1 shows the physical properties of the molding material and the molded article.

Example 3 A mixed water / methanol mixture (water / methanol = 1/1 (weight ratio)) 80 was added to 60 parts of mixed waste paper such as magazines, wrapping paper, and copied paper cut into a size of 2 cm × 3 cm. The used paper was defibrated and pulverized with a super mixer while adding 20 parts by weight, and 20 parts of the same phenol resin as used in Example 1 was added thereto.
20 parts of NIX (inorganic fiber, manufactured by Nitto Boseki Co., Ltd.) and 3 parts of a phosphoric acid-based flame retardant were added, mixed at a temperature of 30 ° C., and formed into chips. The obtained chips were dried in a hot air circulating drier at 85 ° C. for 90 minutes to obtain a waste paper molding material containing a chip-shaped phenol resin having a flow value of 65 cm by a parallel disk method. This material was molded at a molding pressure of 10 kgf / cm ² , a molding temperature of 160 ° C., and a molding time of 90 seconds / mm to obtain a flat molded product having a thickness of 6 mm. Table 1 shows the physical properties of molding materials and molded products.
Shown in

Comparative Example 1 A molding material was obtained in the same manner as in Example 1, except that instead of 80 parts of newspaper and 80 parts of water, 92 parts of newspaper, 100 parts of water and 8 parts of phenol resin were used. . A chip-shaped molding material having a flow value of 50 cm by the parallel disk method was obtained. This was molded in the same manner as in Example 1 except that the molding pressure was changed to 30 kgf / cm ² to produce a plate-like molded product. Table 2 shows the physical properties of the molding material and the molded product.

COMPARATIVE EXAMPLE 2 A supermixer was used to mix and chip in the same manner as in Example 2 except that 40 parts of cardboard pieces, 52 parts of novolak resin and 50 parts of water were used, but the mixture was sticky in the mixer. And a good molding material could not be obtained.

Comparative Example 3 The molding material used in Example 3 was used, and the molding pressure was 50
A flat molded product having a thickness of 3 mm was produced in the same manner as in Example 3 except that the molded product was molded at kgf / cm ² . Table 2 shows the physical properties of the molding material and the molded product.

[0032]

[Table 1] (Note 1) Corresponds to the flame-retardant materials listed in the Ministry of Construction Notification No. 1231.

[0033]

[Table 2]

The physical properties were measured as follows.

Flow value: Based on the in-house parallel disk method. Using a test compression press (26 ton), 5 g of the sample was
The value of the diameter of the disc portion obtained by heating and pressing at 100 kgf / cm ² (G) for 60 seconds on a mold disc at 100 ° C.

Moldability and appearance: Mold (80 mm × 150 m)
mxtmm), 160 ° C-170 ° C, 50kgf
/ Cm ^{2 at} a pressure of 120 seconds / mm or less, and the appearance of the molded article was visually observed and judged.

Density, flexural strength, water absorption: JIS A-5
905 (1994).

Thermal conductivity: direct plate method, JIS A-14
12 was measured.

[0039]

Industrial Applicability The plate-shaped molded article mainly composed of waste paper according to the present invention has low density, and has properties such as cushioning, heat insulation, sound absorption and fire protection, and is useful for building materials and the like. In addition, the present invention is inexpensive because a large amount of used paper is used as it is without the need for alkali treatment or deinking treatment, so it is inexpensive, suitable for reuse of used paper, and useful as an environmental measure.
It is also beneficial from the viewpoint of resource conservation.

Continued on the front page F-term (reference) 2B260 AA02 AA09 BA04 BA15 CB01 CB03 CD02 DA04 DB01 DC05 DC10 DC14 DC15 DC20 EA05 EB02 EB05 EB06 EB08 EB12 EB13 EB19 EB21 EC18 4F204 AA37 AA50 AB03 AB05 AB07 AB11 AR03 AB06 FE30 FF01 FF06 FF21

Claims (3)

[Claims] 1. A waste paper and a waste paper molding material containing a phenolic resin as a main component and a phenolic resin are molded at a molding pressure of 20%.
kgf / cm ² or less, a temperature of 160 to 170 ° C., and a molding time of 120 seconds / mm to 90 seconds / mm, a bending strength of at least 30 kgf / cm ² and a density of 0.3 A plate-shaped molded product mainly composed of waste paper having a thermal conductivity of 0.1 kcal / m · hr · ° C. or less, which is 0.8 g / cm ³ or less. 2. A high-speed rotary stirring mixer disintegrates and pulverizes waste paper while adding at least the same amount of water or solvent as the waste paper weight to 90 to 51 parts by weight of waste paper cut into a size of 3 cm × 3 cm or less. And then phenolic resin 10-4
0 parts by weight, 0 to 39 parts by weight of a pigment, a mold release agent and an inorganic filler, and if necessary, while stirring and adding a curing agent and a flame retardant, are maintained at a temperature of 40 ° C. or less to form chips. A method for producing a waste paper molding material containing a phenolic resin, comprising drying the obtained chip at a temperature of 80 to 100C. 3. A distorted molded article mainly composed of waste paper according to claim 1, wherein the waste paper molding material containing a phenolic resin is a molding material obtained by the method according to claim 2.