JPS6359345A - Granulation of organic fibrous substance - Google Patents

Abstract

PURPOSE:To efficiently prepare a granule easy to handle and having uniform density, by granulating a mixture of an org. fiber substance and a water-soluble polymer powder into the granule with density of 0.5-1.8g/cm<3> using a roll type extrusion granulator. CONSTITUTION:An org. fiber substance and a water-soluble polymer powder are mixed in a mechanical mixer such as a conical blender or a mortar mixer. The resulting mixture is granulated into a granule with a density of 0.5-1.8g/cm<3> using a roll type extrusion granulator of a type continuously extruding a substance to be granulated from a die under pressure by a roll. The org. fiber substances, are exemplified by mechanical pulp, chemical pulp, regenerated pulp, cotton, sawdust, etc. As the polymer powder, a nonionic polymer such as polyacrylamide and an anionic polymer such as sodium polyacrylate are used.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is directed to an organic fibrous material having a size of usually 0.1 to 10 mm and a water-soluble material useful as a water treatment agent, sludge treatment agent, soil improvement agent, etc. The present invention relates to a method for granulating a mixture of polymer powders.

[Conventional technology]

Conventionally, as a technique for increasing the density of a mixture of an organic fibrous material and a water-soluble polymer powder, there is a technique of molding using a pressure molding machine such as a flat plate press, roll press, or screw press, which is described in JP-A-60-197284. There is.

[Problem that the invention seeks to solve]

With the above technology, since the organic fibrous material is bulky, it is difficult to supply it uniformly and quantitatively to the machine.As a result, the density of the finished product varies widely, the shape is unstable, and the speed at which it disintegrates when it is poured into water is slow. There were problems in that it was slow and production efficiency was poor.

[Means to solve the problem]

The present inventors have conducted extensive studies on a method for efficiently granulating granules that are easy to handle and have a uniform density and shape, and as a result, they have arrived at the present invention.

That is, in the present invention, an organic fibrous material and a water-soluble polymer powder are mixed, and the mixture is made to a density of 0.6 to 1.
J3 This is a method for granulating an organic fibrous material, which is characterized by granulating it to g/ad (hereinafter referred to as "organic fibrous material").
Water-soluble polymer powder is called polymer powder).

As the fibrous material in the present invention, known fibers can be used. Examples include mechanical pulp (groundwood pulp from logs, Amefriend method groundwood pulp, etc.) described in JP-A-59-87097, chemical pulp ( sulfite pulp, soda pulp, sulfate pulp, nitrate pulp, chlorine pulp, etc.), semi-chemical pulp (bleached sulfite pulp, unbleached sulfite pulp, etc.), recycled pulp (for example, paper made by once making paper from pulp containing these) or recycled waste paper pulp, which is a mechanically crushed or crushed product of waste paper (newspaper, gunboard, etc.)], cotton, sawdust, grass charcoal, etc. described in JP-A-59-87098. Examples include fibrous materials such as

Among these, regeneration valves are preferred. Among recycled valves, waste paper is the most preferred because it is inexpensive.

The form of the fibrous material is preferably fibrous, but it may also contain small pieces of paper (for example, about 1 to 50 m long).

The size of the fibrous material is usually 0.1 to 1Qmi+, preferably 0.1 to 5 g.

Known polymer powders can be used as the polymer powder in the present invention, such as nonionic polymers such as polyacrylamide and polyethylene oxide, polyacrylamide partial hydrolysates, acrylamide-acrylic acid copolymers or salts thereof,
Anionic polymers such as polysodium acrylate and sodium alginate, polymethacryloyloxyethyltrimethylammonium chloride, acrylamide-methacryloyloxyethyltrimethylammonium salt copolymer,
Cationic polymers such as polyvinylimidacillin, chitosanbori vinylpyridine, and cationically modified products of boriacrylamide and the like can be used.

Cationic polymers are preferred from the viewpoint of the use of granules obtained in these polymer powders.

The size of the polymer powder is not particularly limited as long as it can be applied to a granulator, but is, for example, 10 mesh or less.

The mixing ratio of the fibrous material and the polymer powder is not particularly limited and can be arbitrarily selected depending on the purpose.

The method of mixing the fibrous material and the polymer powder is not limited and can be carried out by any known method. For example, the fibrous material and the polymer powder can be mixed using a mechanical mixing device (conical container rotating type conical blender, mortar mixer, ribbon type ribbon mixer, screw type ribbon mixer, etc.). Nauta mixer 1 High-speed flow type Henschel mixer, flash mixer, paddle type Vorhang mixer, etc. Method of mixing, method of laminating fibers and polymer powder appropriately, JP-A-56-8981 and JP-A-56-8981 Kaisho 5
Examples include the method shown in each publication of No. 8-8175 (however, a polymer powder is used instead of a polymeric resin for suction 2).

Alternatively, a method may be adopted in which both are not mixed in advance and are simultaneously supplied to the granulator at the granulation stage.

In the present invention, granulation can be performed using only the fibrous material and polymer powder, but an auxiliary agent may be added for the purpose of reducing variation in the density of the granulated product and improving productivity.

The auxiliary agent is not particularly limited, but it is solid at room temperature and has a melting point of 16
Organic substances (hereinafter referred to as solid organic substances) and inorganic salts having a temperature of 0° C. or lower are preferable.

Examples of solid organic substances include surfactants such as nonionic polyoxyethylene (7) nonyl 7 enyl ether polyoxyethylene (1) stearyl ether #, (0
The numbers inside indicate the number of moles of oxyethylene group. ]Cationic stearyldimethylbenzylammonium chloride/dinuthearyldimethylammonium chloride,
Anionic nutearic acid monoethanolamine salt, polyoxyalkylene compounds (polyethylene glycol with a polymerization degree of 75, polypropylene glycol with a polymerization degree of 100, etc.), polyolefin derivatives (polyethylene with a polymerization degree of 75, polypropylene with a polymerization degree of 95, melting point 155) ℃
puffin wax, etc.), urea, and ethylene carbonate. Among these, polyolefin derivatives are preferred because of their small variation in density and high productivity.

Examples of inorganic salts include slaked lime, quicklime, calcium carbonate, potassium carbonate, potassium sulfate, potassium carbonate, potassium sulfate, sodium carbonate, sodium sulfate, magnesium hydroxide, aluminum chloride, aluminum sulfate,
Examples include ferrous sulfate and ferric sulfate. Among these, neutral or acidic groups are preferred, and sodium chloride and sodium sulfate are more preferred from the viewpoint of cost.

Although these auxiliary agents are sufficiently effective when used alone, they can also be used in combination of two or more types.

The form of the auxiliary agent is not particularly limited, but may be in the form of granules, powder, granules or flakes.

The amount of the auxiliary agent added is preferably 0.1 to 2 to the fiber material.
0% by weight, particularly preferably 0.1 to 10% by weight. Addition amount of about 0.05% by weight contributes to productivity improvement.
．． When it reaches about 1% by weight, productivity increases significantly.

Moreover, if it exceeds 20% by weight, problems such as die clogging during granulation may occur.

The method of mixing the auxiliary agent is not particularly limited, but it can be carried out in the same manner as the method of mixing the fibrous material and polymer powder described above.

The moisture content of the mixture during granulation is usually 20% by weight or less, preferably 15% by weight or less, based on the mixture of fibers and polymer powder. If the water content exceeds 20% by weight, a portion of the Telimer powder will dissolve, resulting in poor handling and, furthermore, the disintegration speed of the granulated product when added to water becomes extremely slow.

The roll-type extrusion granulator of the present invention is of a type that continuously pressurizes and extrudes the material to be granulated from a die using a roll.
There are the cylindrical die horizontal type, the cylindrical die vertical type, the disk type die horizontal type, etc., which are described in 187-142 (published by Ohmsha Shoten, 1999), and can be used without particular limitation.

The shape of the granulated product depends on the diameter and effective thickness of the die, and can be selected by appropriately selecting an arbitrary die.

The diameter and effective thickness of the die of the granulator are not particularly limited, but from the viewpoint of stability of product shape, the diameter is preferably 2 to 10", and the effective thickness is preferably 6 to 80".

Granulation is usually carried out at room temperature, but depending on the shape of the fibrous material and the physical properties of the polymer powder, granulation may be performed by cooling or heating.

The density of the granules obtained by the method of the present invention is 0.5 to 1.
8 g/crt! It is. If the density is less than 0.517 Cdt, the shape of the granulated product will be unstable and it cannot be said to be very useful. If the density exceeds 1.8 g/7, the shape of the granulated product will be stable, but problems such as slow disintegration speed when added to water and blockage of the die during granulation are likely to occur.

The size of the granules is usually 2 to 4Ql+1lK-,
The shape of the granules is cylindrical, prismatic, etc.

〔Example〕

The present invention will be further explained below with reference to Examples, but the present invention is not limited thereto.

Example 1 Average fiber length 5, moisture 1 made by crushing cardboard paper
1.2 kg of 2% fiber and polymethacryloyloxyethyltrimethylammonium chloride powder as polymer powder (particle size 10 mesh bath, moisture 8 g, [
η) = 5.0 dυj1 colloid equivalent value: 4.9
5meq/, 9) 4oog were mixed with a paddle mixer. The water content in the mixture was 10.7% by weight.

Next, this product was put into a roll-type extrusion granulator (disc pelletizer F-5 manufactured by Fuji Kudal) equipped with a die having a diameter of 8 mm and an effective thickness of 20 mm, and was granulated.

The results are shown in Table-1.

Example 2 In the same manner as in Example 1, only the polymer powder was prepared using polyacrylamide powder (particle size: 40 mesh pass, water content: 8.5 cm, (η
) = 1t, o 617g, coid equivalent value = -
0.01 meql &) and mixed. The water content in the mixture was 10.8%.Then, this was granulated.

The results are shown in Table-1.

Example 8 In Example 1, 0.5% by weight of sulfur salt was added as an auxiliary agent to the mixture of fibers and polymer powder and mixed. The water content in the mixture was 10.6% by weight.Then, this was granulated.

The results are shown in Table-1.

Example 4 In Example 2, a cationic surfactant (stearylbendichloride V dimethylammonium) was added as an auxiliary agent in an amount of 3.0% by weight based on the mixture of fibers and polymer powder. The water content in the mixture was 10.4% by weight.Then, this was granulated.

The results are shown in Table-1.

Comparative Example 1 As a comparative example, 2 kg of fiber used in Example 1 was removed?
- 400 g of powder were mixed in a paddle mixer.

Next, water was added by spray to the mixture so that the water content was 21% by weight.

Granulation was performed using the same granulator as in Example 1.

The results are shown in Table-1.

Comparative Example 2 Polymer powder ft200p was granulated under the same conditions as Comparative Example 1 except for the above. The results are shown in Table-1.

Comparative Example 8 2 kg of fibers with an average fiber length of 6 wings made by crushing cardboard paper and a water content of 11.2% by weight, and polymethacryloyloxyethyltrimethylammonium chloride powder (particle size: 10 methane, water: 8 t) as a polymer powder, [
η) = 5.0 de/y, colloid equivalent value = 4.9
5 meq/g) 40g were mixed using a paddle mixer.

The water content in the mixture was 10.7% by weight.

Next, this material was compressed using a flat plate press to obtain a molded plate with a thickness of 1α, a density of about 0.1 da, and a size of 8. Next, this was lightly broken with a crusher to make chips of about 6jII+ using a friceratomachine. Pressure molding was performed to obtain a go stone-like granulated product with a diameter of 1 crIL.

Table-1 *1 Supplyability ○: Raw materials can be uniformly and quantitatively supplied into the die holes or molds of the granulator. Mu: Raw materials can be supplied almost uniformly and quantitatively into the die holes or molds of the granulator. ×: Unable to uniformly and quantitatively supply the raw material into the die hole or mold of the granulator *2 Disintegration ○: The granulated material disintegrates quickly when put into water ×: The granulated material disintegrates when it is put into water Nupid slow *8 Productivity ◎: Production amount 25 #/h or more ○: I20~
25 kg/hr Δ: 1 15 to 20 1 Can be done. Moreover, this granulated material can quickly disintegrate when placed in water.

A mixture of fibrous material and polymer powder generally has a bulk specific gravity of about 0.01 to 1.5'/m because the fibrous material is bulky.
It is extremely small and difficult to handle practically.

To solve this problem, the mixture can be granulated to increase its bulk density. However, in conventional techniques, for example, techniques in which a mixture of fibers and polymer powder is molded using a pressure molding machine such as a flat plate pre-7, roll bleine, or nuclue prene (e.g., Japanese Patent Application Laid-open No. 197284/1984), the fibrous material is bulky. Therefore, it is difficult to supply a uniform amount to the machine. Therefore, there were problems in that the density of the finished product varied widely, the shape was unstable, the disintegration speed was slow when added to water, and the production efficiency was low. However, according to the present invention, a bulky fibrous material can be uniformly supplied in a fixed quantity, so that the density of the finished product has little variation and its shape is stable. Therefore, when it is put into water, it disintegrates quickly.

The production efficiency is also very high.

Claims (1)

[Claims] 1. A mixture of organic fibrous material and water-soluble polymer powder is processed using a roll-type extrusion granulator to a density of 0.5 to 1.3 g/cm^
3. A method for granulating an organic fibrous material, the method comprising: 2. The granulation method according to claim 1, wherein the water content of the mixture during granulation is 20% by weight or less based on the organic fibrous material and water-soluble polymer powder.