JPS58225193A - Carbon powder for chemical body warmer - Google Patents

Abstract

PURPOSE:To obtain titled carbon powder of low cost, with excellent heat-generating characteristics, by the pyrolysis, in a reducing atmosphere at a specific temperature, of a phnolic resin, followed by carrying out a granulation or grinding operation into a powder of a specific size. CONSTITUTION:The objective carbon powder can be obtained by the decomposition, in a reducing atmosphere at 400-900 deg.C, of a phenolic resin, followed by granulating or grinding the resultant carbonized material into a 5-100 mesh powder. When using, as a feedstock, a phenolic resin containing a halogen-based flame-retardant, incorporation of an alkaline material is preferable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbon powder for use in chemical heating, which has an excellent heat generating function and is obtained by thermally decomposing and carbonizing a phenolic resin.

Recently, heating element compositions that utilize the heat of chemical reactions of inorganic compounds as a heat source, so-called chemical heaters, have been used. This chemical heater is made of iron powder, activated carbon, salts, water, etc., and is used by generating heat when it comes into contact with air. However, the current commercially available products have a maximum temperature of 60 to 70° C., and the higher the maximum temperature, the shorter the duration. In addition, in order to maintain heat generation, high-grade raw materials have to be used even though they are disposable, which is not desirable as it causes an increase in costs. In particular, for activated carbon, which does not have a significant effect on the heat-generating properties of the composition, it is necessary to use a product that has gone through a complicated process to impart activation, the so-called activation process, which is a major factor in increasing costs. was.

In view of these technical and economical drawbacks, the present invention has been made to provide carbon powder for chemical heating with excellent heat generation properties at a low cost.

That is, in the present invention, a phenolic resin is placed in a thermal decomposition furnace and heated to a temperature of 400 to 900°C without or with addition of an alkaline substance.
The carbonized material obtained is crushed or ground into 5 to 100 meshes and used as carbon powder for chemical heating. When alkaline substances are thermally decomposed and charcoal and effluent do not become acidic, d1 can be used as a raw material, mainly phenolic resin without flame retardant. It is preferable to add it when a flame retardant-containing phenolic resin is used as a raw material. By adding an alkaline substance, the charred substances generated during thermal decomposition and the acidic substances in the effluent are neutralized and rendered harmless, thereby exhibiting the effect of preventing corrosion damage to the thermal decomposition equipment. Examples of alkaline substances include hydroxides, oxides, carbonates, etc. of alkali metals or alkaline earth metals, i.e., NaOH1KOH, MP +0H)2, Ca(O
H)2, BFI(OH)2, MfOlCaO, Na2C
One or more types of O3, K2CO3, etc. can be added.

The carbon powder obtained under the above conditions has excellent surface activity and water retention properties that contribute to the oxidation reaction of iron in chemical carbon compositions due to the use of phenolic resin. A step corresponding to the step can be omitted. Furthermore, carbon powder obtained by adding an alkaline substance has a greater surface activity than that obtained without the addition of alkaline substances, and at the same time, salts are formed and remain in the carbide, so it is usually added as a chemical carbon composition. The salt used can be reduced or not added.

As the raw material used for thermal decomposition, by-products generated from the manufacturing process of phenolic resins can be used.

These by-products, which were previously treated as waste and disposed of by incineration, etc., can now be used effectively.
1. Providing carbon powder at low cost. Yo...9. )1 When the thus obtained carbon powder is used as a chemical composition with iron powder, diatomaceous earth powder, water, etc., it is possible to economically obtain a composition that has better exothermic properties than those using ordinary activated carbon. be able to.

Examples will be described below, but the present invention is not limited thereto in any way.

Example 1 100 parts by weight of cut scraps of phenolic resin coffin metal plate containing flame retardant were placed in a thermal decomposition furnace and 10% by weight of hydroxide was added. 30 parts by weight of IJum solution was added (~ ,400
Thermal decomposition was carried out at 800°C for 5 hours. The obtained carbide was crushed and passed through a 30 ml filter, which was then used as carbon powder for the next chemical filter.

Reduced iron powder 30 parts by weight The above carbon powder 15 parts by weight Sand and gravel powder 35 parts by weight Water 20 parts by weight The above composition 80F was placed in a bag to be described later and sealed.
() Shake for seconds Insert in the middle of 6 stacked towels l-7,20
Temperature was measured in a thermostatic chamber at ±2°C and 65±2% RH. The bag for enclosing the exothermic composition is made of non-woven fabric (100% rayon).
)! : 100/100 ventilation holes (area oo81wj) with a sheet-like material laminated with polyethylene film
Use a 100mm x 140cm bag with the nonwoven fabric on the outside using a tWM corner-opened sheet.

The results of evaluating the heat generation behavior under the above conditions are indicated by A in the drawings.

Example 2 100 parts by weight of broken debris from a phenolic resin molded product was placed in a pyrolysis furnace, and 30 parts by weight of a 1% by weight barium hydroxide solution was added thereto.
Carbon powder was prepared in the same manner as in Example 1 by adding a certain amount of
Using this, a chemical coating composition with the following composition was prepared. The temperature of this chemical bath was measured under the same conditions as in Example 1, and the results are shown in the graph A' in the figure.

Reduced iron powder 30 parts by weight The above carbon powder 15 parts by weight Salt 5 parts by weight Gravel soil powder 30 parts by weight Water 20 parts by weight Comparative Example All the carbon powder used was the same as in Example 2, except that activated carbon (commercially available) was used. A chemical cauldron was made using the same composition as in Example 1, and the temperature was measured, and the results are shown as B in the figure.

According to the results of this example, it is confirmed that the duration of heat generation is extended by using the present carbon powder.

[Brief explanation of drawings]

The drawings show the exothermic temperature and duration of the chemical composition according to the present invention. Applicant: Sumitomo Bakelite Co., Ltd. □e￥隨子shoulder (Hr) Procedural amendment (spontaneous) August 23, 1980 Commissioner of the Patent Office α Mr. 1, Indication of the case 1982 Patent Application No. 106245 2, Title of the invention Carbon powder for chemical carbon powder 5 Relationship with the person making the amendment Patent applicant address 1-2-2-4 Uchisaiwai-cho, Chiyoda-ku, Tokyo, Detailed description of the invention in the specification to be amended and Drawing 5, * The "Line (bottom line)" (bottom line) on page 46 of the detailed description of contents of E and the drawings shall be amended as shown in the attached appendix. Example 3 100 parts by weight of cut scraps of a phenolic resin steel clad laminate were placed in a pyrolysis furnace and pyrolyzed at 400°C to 800°C for 5 hours. After pyrolysis, the carbide from which the copper pieces were separated was pulverized, and the carbon powder that had passed through the mesh was used to make a chemical clay using the procedure of Example 1 with the coating composition of Example 2, and the temperature was measured [7, The results are shown as A' in the figure for a 3° comparative example.

Claims (1)

[Claims] (1) A phenolic resin is thermally decomposed at 400 to 900°C in an atmosphere that excludes air or other oxygen.
Carbon powder for chemical heating obtained by crushing or crushing into mesh. (2) A carbon powder for chemical heating obtained by thermally decomposing a phenolic resin together with an alkaline substance at 400 to 900°C in an atmosphere blocked from air and other oxygen, and crushing or crushing it into 5 to 100 mesh pieces. (3) The carbon powder for chemical heating according to claim 1 or 2, wherein the phenolic resin is a by-product. Raw powder. (5) The carbon powder for chemical heating according to claim (4), wherein the flame retardant is a halogen flame retardant. (6) The carbon powder for chemical heating according to claim <2), wherein the alkaline substance is one or more of an alkali metal compound or an alkaline earth metal compound.