A special material for injection molding urea tank and its preparation method

Abstract

The invention provides a special material for injection molding urea tank and a preparation method thereof. The components of the special material include: 50-70 parts of high molecular weight high-density polyethylene, 10-30 parts of high-density polyethylene, linear low-density polyethylene Ethylene 10-40 parts, antioxidant 0.3-0.5 parts, lubricant 0.3-0.8 parts, nucleating agent 0.05-0.3 parts, light stabilizer 0.1-0.3 parts, carbon black 0.3-0.5 parts. The special material of the invention has good fluidity, is suitable for injection molding, solves the problem that it is difficult to prepare qualified urea tank products through injection molding of high molecular weight and high density polyethylene, greatly improves the production efficiency of urea tank products, and at the same time reduces the The effect of metal ions in urea solution on the long-term aging of the product, the obtained product has excellent rigidity and low-temperature impact performance, long resistance to environmental stress cracking, and UV aging resistance, and can be used for a long time under high and low temperature conditions.

Description

Technical field [0001] The present invention relates to a polymer material, and more particularly to an injection molded urea-specific material and a preparation method thereof. Background technique [0002] The urea box is a constituent component of the latheal SCR exhaust gas treatment system for storing urea solutions, typically made of a stainless steel or plastic material of urea corrosion. A variety of accessories should be configured on the urea box, need to be set, and the metal insert is installed. In addition, the urea box needs to meet the requirements of the peripheral conditions of 80 ° C. At this temperature, the urea box often occurs, deformed, cold and hot alternating performance, and breakage, leaks, etc. Possible. At present, the urea box supplied in the domestic market is mainly based on plastic material, and is generally carried out by a roll molding process and a blow molding process. The production efficiency of the roll molding process is low, not suitable ...

AI Technical Summary

Problems solved by technology

However, the melting index of high-molecular-weight high-density polyethylene is extremely low, and it is difficult to prepare qualified urea tank products by injection molding

In addition, urea solution often contains a small amount of metal ions such as copper and iron, which can easily accelerate the oxidative degradation reaction of polyethylene, resulting in premature performance degradation of urea tank products and affecting the long-term use of products

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