Be used as the preparation method of the cotton fibre powder of gas-forming agent in the chemical coating of welding electrode
The present invention relates to a kind of preparation method who is used as the cotton fibre powder of gas-forming agent in the chemical coating of welding electrode.
Chemical coating of welding electrode is formulated by multiple material, plays a part different respectively.It is organic matter that one class material is wherein arranged, and is called " organic matter gas-forming agent ".Its main effect is: in welding process, the high temperature of electric arc makes its burning, becomes carbon dioxide, and this gas has arranged the molten bath ambient air, prevents the erosion of airborne oxygen, nitrogen butt welded seam metal, improves the performance and the quality of welding point.Also have to increase in addition and blow power, stable arc, be beneficial to the effect that restarting etc. improves the welding operation performance.Material as the organic matter gas-forming agent has wood powder, bamboo powder, microcrystalline cellulose etc. at present.Wherein wood powder is to be made by pulverizing such as timber leftover pieces, bark, wood chips; The bamboo powder is to pulverize with bamboo to make; Microcrystalline cellulose is to be made through multiple working procedures such as soda boiling, neutralization, bleaching, washing, drying, pulverizing, screenings by the article that contain cotton fiber such as cotton linter, rag, recovery cotton etc.With microcrystalline cellulose than wood powder, that the bamboo powder is made gas-forming agent is effective, this be since microcrystalline cellulose main component---cotton fiber burns easily than wood powder, bamboo powder, when welding, microcrystalline cellulose is burning fully and rapidly, become carbon dioxide, the smog that produces is few, and arc stability is beneficial to restarting.But make the process complexity of microcrystalline cellulose, the raw material of use are more expensive, thereby manufacturing cost is very high.In a word, existing wood powder as gas-forming agent, bamboo powder, microcrystalline cellulose etc. all have its weak point.
The object of the present invention is to provide a kind of high preparation method of the ratio of performance to price that makes as gas-forming agent cotton fibre powder in the chemical coating of welding electrode.
The waste cotton velvet that strips down from cotton seed hulls when the present invention is achieved in that with the processing cotton seeds is made raw material, promptly obtains product one cotton fibre powder through cleaning, drying, classification.This preparation method's feature is:
The waste cotton velvet that strips down from cotton seed hulls when 1. collecting the processing cotton seeds.
2. with the soluble impurity that contains in the clear water flush away waste cotton velvet raw material.
3. utilize and dry or dry, be dried to moisture content less than 8%;
4. with screening and air classification, remove bigger or heavier impurity particle, make it can pass through the 60-120 mesh sieve, thereby make the cotton fibre powder of pale brown look.
The present invention makes the discarded object of original contaminated environment obtain regeneration, and the cotton fibre powder that makes is as suitable with the microcrystalline cellulose performance during gas-forming agent in the chemical coating of welding electrode, and cost and wood powder, bamboo powder are suitable.Properties of product price prepared in accordance with the present invention is than the wood powder that is better than present use, bamboo powder, microcrystalline cellulose etc.
Further specify the present invention below in conjunction with embodiment.
Embodiment:
1.5 kilograms of the waste cotton velvets that strips down from cotton seed hulls when 1. collecting the processing cotton seeds;
2. the soluble impurity that contains with clear water flush away waste cotton velvet raw material;
3. it is dried, moisture content is reduced to below 8%;
4. with screening and air classification, remove bigger or heavier impurity particle, make it can pass through the 60-120 mesh sieve, thereby obtain about 1 kilogram of cotton fibre powder.