Preparation method of low-odor zinc stearate

Abstract

A method for preparing low-odor zinc stearate is to put fatty acid into the reactor, start stirring and heat up, and after it melts, under the conditions of 0.01-0.02 MPa and 90°C, evacuate for 10-15min by micro-vacuum to remove Most stearic acid contains odorous low-boiling molecules; then add zinc oxide and catalyst in sequence, heat up to 130-135°C, turn on vacuum 0.03-0.04MPa, and perform low-vacuum deodorization operation until the color of the reaction solution changes from milky white to In order to be clear and transparent, the reaction is complete; after that, a vacuum of 0.05-0.08 MPa is turned on, and a high-vacuum deodorization operation is carried out, and finally the material is discharged and pulverized. The preparation method of the low-odor zinc stearate of the present invention uses the original three-stage vacuum deodorization technology in the reaction process, and the prepared zinc stearate has lower odor and higher purity and is completely suitable for the field of low-odor plastics.

Description

technical field [0001] The invention relates to the field of rubber and plastic additives, in particular to a method for preparing low-odor zinc stearate. Background technique [0002] Plastics are used more and more in daily life. With people's requirements for ride comfort, health and safety, low-VOC and low-odor plastics are favored by manufacturers, especially in automotive plastics and yoga mats. Formed a low-odor plastic industry. Zinc stearate is commonly used as an additive in plastic production. In the field of low-odor plastics, there is also a corresponding low-odor requirement in the industry. It must pass the corresponding odor test. Generally, the odor level is required to be ≦2. The existing odor rating reference is divided into 1-6 levels, 1st level evaluation standard: can not feel; 2nd level evaluation standard: can be felt, no hindrance; Big hindrance; Grade 4 evaluation standard: obstructed; Grade 5 evaluation standard: relatively large obstruction; Gra...

AI Technical Summary

Problems solved by technology

The existing odor rating reference is divided into 1-6 levels, 1st level evaluation standard: can not feel; 2nd level evaluation standard: can be felt, no hindrance; Major hindrance; Level 4 evaluation standard: obstructed; Level 5 evaluation standard: relatively large obstruction; Level 6 evaluation standard: unbearable

[0003] In recent years, there are two main methods for the production of zinc stearate: one is to use metathesis production, firstly add caustic soda to stearic acid for neutralization reaction, then add zinc salt for metathesis...