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 reaction, after dehydration, drying, crushing, packaging After forming monomeric zinc stearate, the zinc stearate odor level of output is generally ≥ 3, and the purity is low, so it is not suitable for the field of low-odor plastics; the second method is to apply coulter machine or kneader Acid, zinc oxide, and catalyst react directly at a certain temperature to produce monomeric zinc stearate. The zinc stearate produced is higher in purity than the first type, but the odor level is generally ≥ 2, and it is not suitable for low-odor plastics. field