JP2001009811A - Mixture of cellulose and flame retardant and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixture of highly flame retardant cellulose and a flame- retardant by mixing a cellulose material and the flame retardant. SOLUTION: First 95-50 wt.% cellulose material and 5-50 wt.% flame- retardant are charged into a grinding/blending mixer 1 to be ground and mixed and it is so arranged that the cellulose material won't be ignited by heat generated during grinding. Further, the flame-retardant is made to fixedly stick to the surface of the cellulose and thus a flame retardant mixture which is applicable to various kinds of use such as a building material, furniture and a container, is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a material containing cellulose components such as wood obtained by thinning and the like, waste wood for construction, plant waste such as bagasse (sugar cane marc) and rice husk, waste pulp such as waste paper, etc. In particular, the present invention relates to a "cellulose-based material"), and more particularly, to a flame-retardant mixed material obtained by mixing cellulose and a flame retardant, and a method for producing the same.

[0002]

2. Description of the Related Art In recent years, where deforestation and environmental pollution on a global scale have become problems, the effective use and reuse of resources has become an issue for humankind in terms of environmental conservation. As one of these measures, wood obtained from thinning, building waste wood,
There is an effective use of cellulosic materials such as plant waste such as bagasse and rice husk, and pulp waste such as waste paper.

More specifically, for example, Japanese Patent Application Laid-Open No. H11-584
No. 83 discloses, in a method for forming a woody synthetic sheet, a technique of pulverizing and drying a cellulosic crushed product by a stirring impact force, kneading with a thermoplastic resin, and forming a woody synthetic sheet agent. Japanese Patent Application Laid-Open No. 9-183121 discloses a cellulose powder pellet obtained by granulating cellulose-based waste such as waste wood or waste paper using a PET resin as a binder, and a granulating method thereof.

[0004]

DISCLOSURE OF THE INVENTION The present inventors intended to use cellulosic materials for building materials, furniture, containers, and other various uses, and to make effective use of cellulosic materials. There was a problem that it was easy to burn. Therefore, when a cellulosic material is used for building materials, furniture, containers, and the like, it is necessary to ensure flame resistance in order to ensure safety.

[0005] In addition, a cellulose-based material, which contains a relatively large amount of water, is mixed with a plastic material and used as a moldable material. Or pulverize the cellulosic material and plastic material with a pulverizer / mixer,
It is dried and mixed, but there is also a risk of ignition of the cellulosic material due to the heat generated during such pulverization. Therefore, even in such a pulverizing step, it is necessary to make the cellulosic material flame-retardant. For example, some flame-retardant wood flour is made by impregnating a liquid flame retardant into wood flour, but if you try to dry it, the flame-retardant plugs the wood flour conduit, causing It is difficult to remove water.

An object of the present invention is to solve such a problem that the cellulosic material is flammable. By adding a flame retardant to the cellulosic material, the cellulosic material can be crushed and dried. An object of the present invention is to provide a mixed material of a cellulosic material and a flame retardant which is excellent in flame retardancy while preventing the risk of ignition at the time.

The present invention contributes to the improvement of the global environment by realizing such a cell-based mixed material having excellent flame retardancy, thereby making effective use of cellulosic materials including new materials and wastes, and improving the global environment. , Providing a material with excellent moldability by adding a binder, and adding various additives to increase the added value applicable to various applications.
It is to provide low cost materials.

In the above-mentioned Japanese Patent Application Laid-Open No. 11-58483, a technique for pulverizing and drying a cellulosic crushed product by a stirring impact force in a method for forming a woody synthetic sheet is disclosed. It relates to pulverization and drying, and does not disclose or suggest a flame-retardant mixed material formed by mixing a cellulose with a flame retardant, mixing and stirring in a refractory state.

[0009]

According to the present invention, in order to solve the above-mentioned problems, a cellulose-based material (95 to 50% by weight) and a flame retardant (5 to 50% by weight) are charged into a pulverizing / mixing mixer, and pulverized. While drying the material, in a method of producing a mixed material of cellulose and a flame retardant by adhering and fixing a flame retardant on the surface of the cellulose, by adding the flame retardant, the heat generated at the time of the pulverization, Provided is a method for producing a mixed material of cellulose and a flame retardant, characterized in that the cellulosic material is pulverized and dried without firing.

[0010] In order to solve the above-mentioned problems, the present invention provides a cellulose-based material of 95 to 50 wt% and a flame retardant of 5 to 5 wt%.
0 wt% is a mixed material of cellulose and a flame retardant, which is formed by being crushed and mixed by a crushing / mixing mixer, and a flame retardant is adhered and fixed to the surface of cellulose, and is crushed by the flame retardant. A mixed material of cellulose and a flame retardant, characterized in that the cellulose material is pulverized and dried without being ignited by heat generated at the time.

An additive may be added to the cellulosic material and the flame retardant to produce a mixed material of the cellulose and the flame retardant containing the additive. In this case, the additives are 0.1 to 30% by weight of an inorganic material, 0.1 to 30% by weight of an organic material, and 0.1 to 3% by weight of an ultraviolet absorber based on the entire mixed material of cellulose and a flame retardant containing the additive. And charcoal 0.1-30wt%
And one or more selected from the group consisting of: and the total amount of the additives and the flame retardant is not more than 50 wt%.

The above-mentioned mixed material of cellulose and flame retardant
99% by weight and 70 to 1% by weight of a binder or 70 to 1% by weight of a binder and 0.1 to 1% by weight of a compatibilizer are mixed to form a mixed material of the cellulose and the flame retardant into a fluid state capable of being molded. A mixed material of a flame retardant may be manufactured. In this case, the binder is at least one selected from the group consisting of a thermoplastic resin, a thermosetting resin, a protein, and a carbohydrate.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a mixed material of cellulose and a flame retardant according to the present invention and a method for producing the same will be described with reference to the drawings. Cellulosic material used in the present invention,
Various shapes are conceivable, for example, a shape obtained by cutting or crushing a raw material such as wood into chips to obtain a crushed product, or a raw material raw material such as rice husk.

A technique for drying a cellulosic material with the heat generated while pulverizing a cellulosic material with a mixer is already known. However, since cellulosic materials are flammable, care must be taken not to ignite.

The present invention relates to a mixed material of cellulose and a flame retardant obtained by mixing a cellulose-based material with a flame retardant, pulverizing and drying, and adhering and fixing the flame retardant to the surface of the cellulose. By adding, it is possible to prevent the problem of ignition due to heat during the pulverization and stirring, and it is possible to obtain a mixed material having a flame-retardant effect against heat generated when mixing the mixed material with a resin or the like. Further, a mixed material of cellulose and a flame retardant has a high flame retardancy because it contains a flame retardant and can be used for various applications.

FIG. 1A is a diagram showing an example of a pulverizing / mixing mixer used for producing a mixed material according to the present invention. The crushing / mixing mixer 1 has a crushing blade 3 mounted on a rotary drive shaft 4 in a mixer vessel 2, and the rotary drive shaft 4 is rotated by a motor such as an electric motor or a hydraulic motor. Then, the crushing blade 3 is rotated. In the mixer container 2, 95-50 wt% of the cellulosic material is contained.
And 5 to 50 wt% of the flame retardant, and the pulverizing / mixing mixer 1 is operated to pulverize, dry and mix. Then, the mixed material of the produced cellulose and the flame retardant is taken out from the outlet 5. The drying is performed when the moisture content of the cellulosic material is 5
It is desirable that the treatment be performed up to wt% or less. When using a thermoplastic resin as a binder, the water content is preferably 1% or less.

In the present invention, since the pulverization and drying of the cellulosic material and the mixing with the flame retardant are carried out simultaneously by the pulverization / mixing mixer 1, the pulverization of the cellulosic material by heat generated by shearing, friction and the like during the pulverization of the cellulosic material. The base material is dried, but does not ignite even if the cellulosic material is overheated. Then, the flame retardant is adhered and fixed to the surface of the cellulose, and a mixed material of the cellulose and the flame retardant is manufactured.

As the flame retardant, magnesium hydroxide, aluminum hydroxide, antimony trioxide, zircon oxide,
Materials include barium metaborate, zinc borate, phosphate esters, tricresyl phosphate, and the like.

Further, in addition to the cellulosic material and the flame retardant, an inorganic agent (titanium oxide, iron oxide, calcium carbonate, etc.)
0.1-30 wt%, organic material (organic pigment etc.) 0.1-3
0 wt%, UV absorber (2-hydroxybenzophenone, triazole, salicylic acid derivative, acrylonitrile derivative, etc.) 0.1-3 wt% and charcoal 0.1-
If one or more kinds selected from the group consisting of 30 wt% are added up to 50 wt% in total with the flame retardant,
The functions of the respective additives are imparted to form a further highly functional material. For example, when titanium oxide is added, an antibacterial function is exhibited by a photocatalytic action.

The mixed material of the cellulose and the flame retardant can be used as it is in a bag or a case and appropriately used for building materials and other purposes. Thereby, it can be formed into a plate, a bar or the like, and when the cellulosic material is pulp, papermaking becomes possible. As for the cellulosic material, it is easy to allow air to pass through by adding a protein and having a foamy shape and having pores, which is suitable for a filter or the like.

Mixed material of cellulose and flame retardant 30 to 99
wt%, and a total of 70 to 1 wt% of one or more selected from the group consisting of a thermoplastic resin, a thermosetting resin, a protein, and a carbohydrate as a binder. 0.1-1 wt% of maleic acid, carboxylic acid, etc.) is stirred and melted and mixed by a pulverizing / mixing mixer 1 to obtain a mixed material of cellulose and a flame retardant in a fluid state that can be injected, extruded, etc. The material containing is manufactured. Addition of a compatibilizer together with a binder promotes dispersion, and particularly in the case of a thermoplastic resin, increases the bending strength and decreases the linear expansion coefficient.

The mixing ratio of the binder to be added to the mixed material of cellulose and the flame retardant is appropriately selected according to the type and combination of the cellulose and the binder. For example, 99 wt% of a mixed material of a pulp-based material and a flame retardant and 1 wt% of a carbohydrate, or 50 wt% of a mixed material of a wood flour and a 50 wt% of a polypropylene.

The mixed material of the cellulose and the flame retardant to which the thermoplastic resin has been added is stirred and cooled by a cooling mixer and granulated. An example of this cooling mixer is shown in FIG. The cooling mixer 6 is configured such that stirring blades 9 are attached to a rotary drive shaft 8 that is selected and driven to rotate at a low speed or a high speed by an electric motor or a hydraulic motor in a mixer container 7.

The mixed material of cellulose and the flame retardant to which the thermoplastic resin has been added is put into a mixer vessel 7 and slowly stirred at low speed by a stirring blade 9 and cooled, whereby the mixed material is granulated. You. The mixture is milled by rotating the stirring blade at a high speed to obtain a mixed material of cellulose and a flame retardant having a uniform particle diameter. In the case of molding into a fixed shape by using the granular mixed material, it is sufficient to appropriately heat and melt and then perform injection and extrusion molding.

In general, a flame retardant is mixed with a resin in order to make the resin material flame-retardant, but rather than directly mixing the flame retardant into the resin, the resin is adhered and fixed to the surface of cellulose as in the present invention. Mixing with a resin as a mixed material of cellulose and a flame retardant formed as described above forms a homogeneous mixed material having excellent dispersibility of the flame retardant.

[0026]

EXAMPLES Examples of a mixed material of cellulose and a flame retardant and a method for producing the same according to the present invention will be described below. 10 kg of wood flour (100 mesh pass, water content of 10 wt%) and 2.5 kg of magnesium hydroxide as a flame retardant, a multi-stage vane Henschel type mixer having an internal volume of 20 liters (specifically, "Super mixer manufactured by Kawada Industries Co., Ltd.") ), Pulverized and mixed. When grinding and mixing are performed for about 30 minutes,
The temperature became 158 ° C., and the water content became 0.4 wt%. Observing the state of the mixture at this time, the flame retardant was adhered and fixed to the surface of the wood flour, and a mixed material of cellulose and the flame retardant was produced.

On the other hand, as a comparative example, wood powder was subjected to the same treatment without mixing with a flame retardant. That is, 10 kg of the same wood flour
Put into a 20 liter Henschel type mixer,
Crushed. As a result, the wood flour reached 154 ° C. after 30 minutes, and the water content became 0.5 wt%.

(Ignition and Combustion Test) Each of the thus obtained mixed material of cellulose and flame retardant according to the example of the present invention and wood powder according to the comparative example was 10 cm in length.
A flame of the same intensity was radiated for 1 minute from a distance to observe the state. Then, the surface of the mixed material of cellulose and the flame retardant according to the example was burnt black, but the ignition of the mixed material itself was not visible. On the other hand, the wood flour of the comparative example ignited and burned out.

Next, the mixed material of cellulose and a flame retardant according to the example and the wood flour according to the comparative example were respectively added to the following:
Epoxy 2 solution was mixed at a weight ratio of 1 and UL94 (abbreviation of Underwriters Lavoratories, a standard for the safety of electrical appliances in the United States) was 94HB (indicating the practical flammability of plastics; The unit when the is horizontal.) Make a test piece to match the horizontal combustion test of
The test was performed according to the above standard. As a result, the test piece according to the example passed 94HB, and the test piece according to the comparative example did not pass 94HB.

From the above test results, it was confirmed that when a flame retardant such as magnesium hydroxide was adhered and fixed on the surface of cellulose, a flame retardant effect was obtained. When an inorganic compound such as titanium oxide or iron oxide is added, the flame retardant effect increases, and when charcoal is added, the flame retardant effect slightly decreases.

Although the embodiments and examples of the present invention have been described above, the present invention is not particularly limited to the configurations of the embodiments and examples, and the technical features described in the claims are not limited. Various embodiments within the scope of the matter,
It goes without saying that embodiments are possible.

[0032]

As described above, the mixed material of cellulose and a flame retardant and the method for producing the same according to the present invention solve the problem that the cellulosic material is easily burned, and are used for building materials, furniture, containers, and other materials. It can be widely used for various applications. As a result, effective utilization of cellulosic materials including new materials and waste materials can be achieved, which can contribute to improvement of the global environment.

When a cellulosic material is mixed with a plastic material and used as a moldable material, only the cellulosic material is crushed and dried in advance by a crushing / mixing mixer, or the cellulosic material and the plastic material are crushed and dried.
The mixture is crushed and dried by a mixing mixer, and then mixed, but even if heat is generated during such crushing, since the flame retardant has been introduced, the mixing operation can be performed safely without danger of ignition or fire. I can do it.

[Brief description of the drawings]

FIG. 1A is a partially broken perspective view of a pulverizing / mixing mixer used in the present invention, and FIG. 1B is a partially broken perspective view of a cooling mixer.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Crushing and mixing mixer 2, 7 Mixer container 3 Crushing blade 4, 8 Rotary drive shaft 5, 10 Discharge port 6 Cooling mixer 9 Stirring blade

Continued on the front page (72) Inventor Yoichi Torimitsu 3-15-1-202 F-term (reference) 2B260 AA02 AA20 BA01 BA04 BA05 BA07 BA08 BA18 CD02 CD06 CD30 DA01 DA11 DA17 DA18 DB01 DB03 DC20 DD03 EB02 EB05 EB08 EB12 EB19 EB42 EC18

Claims (6)

[Claims] 1. A cellulosic material of 95 to 50 wt% and a flame retardant of 5 to 50 wt% are put into a pulverizing / mixing mixer and pulverized to dry the cellulosic material and adhere and fix the flame retardant on the surface of the cellulose. In the method for producing a mixed material of cellulose and a flame retardant, by adding the flame retardant, the cellulose-based material is crushed and dried in a state where the heat generated at the time of the crushing does not ignite. A method for producing a mixed material of cellulose and a flame retardant. 2. A method of adding an additive to the above-mentioned cellulose-based material and the above-mentioned flame retardant to produce a mixed material of the cellulose and the flame retardant containing the additive, wherein the additive comprises a cellulose containing the additive. Select from the group consisting of 0.1 to 30% by weight of inorganic material, 0.1 to 30% by weight of organic material, 0.1 to 3% of ultraviolet absorber, and 0.1 to 30% by weight of charcoal based on the whole mixed material of flame retardant. 2. The method for producing a mixed material of cellulose and a flame retardant according to claim 1, wherein one or more kinds of the additives are added, and the total amount of the additive and the flame retardant is added within 50 wt%. . 3. A mixed material 3 of said cellulose and a flame retardant.
0 to 99 wt%, and 70 to 1 wt% of a binder or 70 to 1 wt% of a binder and 0.1 to 1 wt% of a compatibilizer to make the mixed material of the cellulose and the flame retardant into a fluid state capable of being molded. And a method for producing a mixture of a flame retardant and a binder, wherein the binder is one or two selected from the group consisting of a thermoplastic resin, a thermosetting resin, a protein and a carbohydrate.
The method for producing a mixed material of cellulose and a flame retardant according to claim 1 or 2, wherein the mixed material is at least one kind. 4. A cellulose obtained by pulverizing and mixing 95 to 50% by weight of a cellulosic material and 5 to 50% by weight of a flame retardant with a pulverizing / mixing mixer and adhering and fixing the flame retardant to the surface of the cellulose. A mixture of a flame retardant and a mixture of a cellulose and a flame retardant, wherein the flame retardant causes the cellulose-based material to be crushed and dried without being ignited by heat generated during the crushing. material. 5. A mixed material of cellulose and a flame retardant, which is formed by adding an additive to the cellulosic material and the flame retardant, and then pulverizing and mixing the additive, wherein the additive comprises: 0.1-30 wt% of inorganic material, 0.1-30 wt% of organic material, 0.1-3 wt% of ultraviolet absorber, based on the whole mixed material of cellulose and flame retardant including additives
And 1 selected from the group consisting of 0.1-30 wt% charcoal.
5. The method for producing a mixed material of cellulose and a flame retardant according to claim 4, wherein two or more kinds of said additives are added in a total amount of not more than 50 wt% with a flame retardant. 6. A mixed material 3 of said cellulose and a flame retardant.
0 to 99 wt%, 70 to 1 wt% of a binder, or 70 to 1 wt% of a binder and 0.1 to 1 wt% of a compatibilizer are mixed, and the mixed material of the cellulose and the flame retardant is formed into a flowable state that can be molded. The binder is one or two selected from the group consisting of a thermoplastic resin, a thermosetting resin, a protein, and a carbohydrate.
The method for producing a mixed material of cellulose and a flame retardant according to claim 4 or 5, wherein the mixture is at least one kind.