JPS5997510A - Carbonaceous molded body - Google Patents

Abstract

PURPOSE:To obtain an inexpensive carbonaceous molded body of high quality by using carbonaceous powder produced by heat treating chaff, a binder selected from synthetic resin, tar and pitch, and additives selected from graphite, mica and coke as starting materials. CONSTITUTION:Chaff is charged into a vessel and heated at 900-1,200 deg.C in an atmosphere of a reducing gas for about 30min to produce carbonaceous powder. To 38wt% of the powder are added 48wt% synthetic resin, 10wt% graphite and 7wt% mica, and they are kneaded with a kneader. The kneaded material is granulated with an extruder, dried, and crushed with a crusher. The resulting fine powder is charged into a metallic mold heated to about 110 deg.C, and it is molded by holding under about 200kg/cm<2> molding pressure for 10-20min.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a carbonaceous molded body, and more particularly to a molded body manufactured using carbonaceous powder obtained from rice husk as a raw material.

Conventional carbonaceous molded bodies are usually manufactured by using carbon fiber as a raw material, adding synthetic resin, tar or pitch as a binder, and further adding graphite or mica. Carbonaceous molded bodies are required to have a certain level of mechanical strength and abrasion resistance, and the carbon fibers are essential for increasing the strength, and are usually blended in an amount of approximately 10% of the weight.

However, when carbon fiber is used as a raw material, various manufacturing steps such as drying, crushing, molding, and curing are complicated, and it is difficult to control the working conditions. −
For example, during drying, if the material is overdried, it may adversely affect the strength after molding, so it is necessary to maintain an appropriate amount of moisture before proceeding to the next step. Therefore, sufficient consideration must be given to drying time, temperature, etc.
Furthermore, other processing conditions require precision, resulting in increased costs and product prices. Furthermore, from a performance standpoint, in addition to some drawbacks in wear resistance, there is also a drawback in that the temperature on the sliding surface increases significantly during operation.

The present invention aims to solve various difficulties in obtaining conventional carbonaceous molded bodies as described above, and uses rice hus as a raw material and carbon produced by heat treatment of the rice husk to produce a carbonaceous molded body. carbonaceous powder, any binder selected from synthetic resin, tar or pitch mixed in the carbonaceous powder, and any additive selected from graphite, mica or coke. It is something to do.

The rice husk used as a raw material in the present invention is a waste product after removing a large number of rice grains during the rice production process, and is available at a low cost.Table 1 shows the main components of the rice husk.

[Table 1] Components of rice husk The method for manufacturing the carbonaceous molded body according to the present invention is detailed below for the convenience of explanation. Rice husks were placed in a suitable container and heated for 900 min in an atmosphere of a suitable reducing gas such as hydrogen gas. Carbonaceous powder is obtained by heating within a temperature range of 1200°C to 1200°C, preferably 1050°C to 1150°C, for about 30 minutes.Next, the weight percent of this carbonaceous powder is added to 48 weight% of synthetic resin. , 10% by weight of graphite, and 7% by weight of mica, and then kneaded in a kneader at room temperature for about 40 minutes.

Furthermore, the mixture is granulated using an extruder and air-dried for about 1 hour. After drying in a dryer for about 20 hours while maintaining the temperature at 50°C, it is coarsely crushed using a crusher and further crushed to make a fine powder.

The powder obtained through the above steps is placed in a mold heated to about 110° C., and molded at a molding pressure of 200° C. for 10 to 20 minutes.

Next, the molded material extracted from the mold was placed in an electric furnace maintained in an atmospheric atmosphere, and after heating at 150°C for about 5 hours,
Raise the temperature to 180℃, heat for about 5 hours, and then heat for 200℃.
The mixture is heated to 0.degree. C. and heat-treated for about 15 hours to completely harden it, thereby obtaining a carbonaceous molded article.

On the other hand, in order to compare the carbonaceous molded article according to the present invention with the conventional example, 40% by weight of carbon fiber was used as the raw material,
A material containing 43% by weight of a synthetic resin as a binder and 17% by weight of graphite as an additive was prepared by the same method as the carbonaceous molded body according to the present invention. However, in order to avoid over-drying due to the above-mentioned reasons, we changed the conditions of drying the mixed material in the dryer at 50°C for 20 hours.
The results of testing the carbonaceous molded article of the present invention obtained using the above-mentioned raw material blending ratio and a comparative example according to the test items shown below are described below.

Test item 1: Compressive strength test conditions: The shape of the carbonaceous molded body during molding was
A compressive load was applied using an Amsler universal testing machine, and the load until cracks appeared in the molded sample was measured. The results are shown in Table 2.

[Table 2] As is clear from Table 2, the products of the present invention have higher compressive strengths than the comparative examples.

Test item 2: Abrasion resistance test conditions: The shape of the carbonaceous molded body when molded has an outer diameter of 20z
1 Formed into a ring shape with an inner diameter of 120 mm and a height of 15 (n+m), hardened, and tested using a thrust type abrasion tester to obtain a load pressure of P; + ),
Under the conditions of the mating material 845C' (hardness ζ 50), the amount of wear and abrasion of the molded body, the hardness of the mating material after the test, and the temperature change during the test time were investigated. The results are shown in Table 3 and the attached drawings. [Table 3] As is clear from Table 3, the amount of wear and abrasion of the product of the present invention is much smaller than that of the comparative example. Furthermore, as shown in the drawing, the product of the present invention (A) exhibited stable low temperature characteristics during the test period, whereas the comparative example (B) showed a low temperature characteristic that was stable during the test period. and exhibits unstable temperature characteristics.

As explained above, the present invention is characterized in that it is a carbonaceous molded article produced by obtaining carbonaceous powder using rice husks as a raw material instead of conventional carbon fibers, and adding a binder and additives to the powder. Compared to conventional products, the obtained carbonaceous molded product has excellent compressive strength, wear amount, and wear amount, and does not affect the hardness HRC of the mating material even when sliding, and does not generate heat. It also has the advantage of low temperature. Moreover, the raw material, rice husks, is always generated during the rice production process, and in the current situation where farmers are at a loss as to how to dispose of them, it is advantageous to be able to obtain them at an extremely low price. It is extremely effective when combined with high quality.

[Brief explanation of drawings]

The drawing is a graph showing the temperature change during the test time between the product of the present invention and the comparative example. Procedural amendment (Yamamoto) March 1, 1985, 1゛Royalty Office, Mr. Kazuo Harusugi] 7j+ display Show+l' 7 ”lq exist 1-N (I if!204
558 No. 2 Name of foaming Carbon purchase form 3 Relationship with the person making the amendment 41 cases Special plan applicant 4, agent 105S, Daily edition of the amendment order I'll correct it. ■In the first line of "[Table 3]", "Experimental Shun's first material HRCj is [Fu J4th Naru's opponent, G]'s hard HRC) J +1d". ■I would like to make one correction to ``The gun is the HRCJ money 11,'' which was deleted on page 8 of the 8th page. ■Tap 4 +1. First of all, I stopped at ``Hardness HRCJ ke `` Castle'' in No. 9, No. 11, No. 9. that's all

Claims (1)

[Claims] A carbonaceous powder made from rice husk as a raw material and produced by heat treatment of the rice husk, an arbitrary binder selected from synthetic resin, tar or pitch mixed in the carbonaceous powder, and a selected one selected from graphite, mica or coke. A carbonaceous molded article characterized by being further added with optional additives.