A cleaning process for the production of cellulose foam material

Abstract

The invention provides a cleaning process for production of a cellulose foam material. The cleaning process is characterized by comprising the steps of acid cleaning and bleaching, wherein the acid cleaning step comprises: extruding a prepared cellulose foam material until the height is 70-80% of the initial specification height, and injecting an acid solution, and the amount of the injected acid solution is 1.2-1.5 times that of the initial specification height; in the acid cleaning step, the acid solution is one or more of a sulfuric acid solution, a hydrochloric acid solution, and an acetic acid solution; and the pH value of the acid solution is 3-4, and the temperature of the acid solution is 40-100 DEG C. According to the cleaning process for cleaning the cellulose foam material, provided by the invention, the produced cellulose foam material does not have acicular crystals on the surface, and is good in appearance, and the whiteness is more than or equal to 80%; and by adopting the process for cleaning the cellulose foam material, adopted by the invention, the cleaning time is 90-150min, and the production efficiency is greatly improved.

Description

technical field [0001] The invention relates to a cleaning process for the production of foamed materials, in particular to a cleaning process suitable for the production of cellulose foamed materials. Background technique [0002] Cellulose foam material has biodegradability, oil absorption, strong water absorption and water expansion, so it can be used for civil cleaning, industrial cleaning and water engineering. As people's awareness of environmental protection continues to increase, the market demand for cellulose foam materials will continue to increase. Cellulose foaming material is mainly prepared from regenerated cellulose solution, reinforcing fiber and Glauber's salt (sodium sulfate decahydrate) through material mixing, injection molding, heat curing, neutralization, bleaching, cleaning and other process steps. Sodium sulfate aqueous solution is easy to produce a large number of needle-like crystals at room temperature, resulting in poor appearance of the cellulo...

AI Technical Summary

Problems solved by technology

[0006] 3. In the prior art, large-scale industrial dehydrators are used to dehydrate cellulose foam materials, which is unsafe;

[0007] 4. In the prior art, a large industrial dehydrator is used to dehydrate the cleaned cellulose foam material, resulting in a substantial increase in equipment investment costs;

[0008] 5. In the prior art, the entire cleaning process for the production of cellulose foam materials needs to be soaked for 5-12 hours to dissolve the internal Glauber's salt, and the production efficiency is too low;

[0009] 6. When the pore size of the cellulose foam material product is <1mm, it is difficult for the cleaning solution to enter the product, resulting in difficulty in dissolving the internal sodium sulfate;

[0010] 7. In the prior art, during the elution process of the cellulose foam material, the amount of magnesium chloride used is too large, so that the prepared cellulose foam material has too high a salt content, resulting in high difficulty in downstream cleaning;

[0011] 8. In the existing technology, due to the high salt content in the cellulose foam material, during the processing of the foam material by downstream customers, salt dust is prone to occur in the production of dry products, and the cutting machine corrodes quickly, etc.;

[0012] 9. The process of cleaning the cellulose foam material in the prior art is not suitable for large-scale production