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A kind of preparation method of special wax modified by rheology additive for solvent-based coating

A rheological additive and solvent-based technology, applied in the field of coating additives, can solve problems such as failing to meet coating fineness requirements, affecting storage stability, and increasing product fineness, achieving high viscosity, high hardness, and shear The effect of increased shear rate

Active Publication Date: 2020-02-11
淄博市临淄齐泉工贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The oxidation of polyethylene wax introduces impurities due to the addition of catalysts; if the reaction time is too long, a large number of by-products will be produced, and even some cross-linking reactions will occur, resulting in the reduction of oxygen-containing groups, affecting storage stability, and more macromolecular products after long-term reaction. , the product fineness increases, failing to meet the coating fineness requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) High-density polyethylene resin is pyrolyzed at 385°C to produce the first polyethylene wax with a viscosity-average molecular weight of 1300, and another high-density polyethylene resin is pyrolyzed at 410°C to produce the second polyethylene wax with a viscosity-average molecular weight of 800. Add 30 parts of the first polyethylene wax and 15 parts of the second polyethylene wax into the compounding kettle in parts by weight, heat the compounding kettle to 170°C to melt and stir the two polyethylene waxes evenly;

[0025] 2) Add 5 parts of paraffin wax into the compound kettle by weight, keep the molten state at 170°C and keep it warm and stir to obtain a mixed solution, in which the paraffin wax is No. 56, No. 64 and No. 70 paraffin wax according to the mass ratio of 1:5~5.3:2~ 2.6 mixtures;

[0026] 3) After raising the temperature of the reactor to 140°C, transfer the mixture into the reactor;

[0027] 4) Put 9 parts by weight of oxidant into the mixed solutio...

Embodiment 2

[0029] 1) High-density polyethylene resin is pyrolyzed at 380°C to produce the first polyethylene wax with a viscosity-average molecular weight of 1400, and high-density polyethylene resin is pyrolyzed at 400°C to produce the second polyethylene wax with a viscosity-average molecular weight of 900, by weight Add 30 parts of the first polyethylene wax and 10 parts of the second polyethylene wax into the compounding kettle, heat the inside of the compounding kettle to 165°C to melt and stir the two polyethylene waxes evenly;

[0030] 2) Add 10 parts of paraffin wax in parts by weight to the compound kettle, keep the molten state at 165°C and keep it warm and stir to obtain a mixed solution; the paraffin wax is a mixture of No. 56, No. 64 and No. 70 paraffin waxes in a mass ratio of 1:5:2.6;

[0031] 3) After raising the temperature of the reactor to 140°C, transfer the mixture into the reactor;

[0032]4) Put 15 parts by weight of oxidizing agent into the mixed solution, keep th...

Embodiment 3

[0034] 1) High-density polyethylene resin is pyrolyzed at 385°C to produce the first polyethylene wax with a viscosity-average molecular weight of 1300, and high-density polyethylene resin is pyrolyzed at 420°C to produce the second polyethylene wax with a viscosity-average molecular weight of 700, by weight Add 10 parts of the first polyethylene wax and 20 parts of the second polyethylene wax into the compounding kettle, heat the compounding kettle to 140°C to melt and stir the two polyethylene waxes evenly;

[0035] 2) Add 20 parts of paraffin wax in parts by weight to the compound kettle, keep the molten state at 175°C and keep it warm and stir to obtain a mixed solution; the paraffin wax is a mixture of No. 56, No. 64 and No. 70 paraffin waxes in a mass ratio of 1:5.3:2;

[0036] 3) After raising the temperature of the reactor to 130°C, transfer the mixed solution into the reactor;

[0037] 4) Put 20 parts by weight of oxidizing agent into the mixed solution, keep the temp...

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Abstract

A method for preparing modified special wax for a rheological additive of a solvent-based coating belongs to the technical field of coating additives, and is characterized by comprising the following steps: adding 10-40 parts of polyethylene wax with the viscosity-average molecular weight of 1,000-1,500 and 10-40 parts of polyethylene wax with the viscosity-average molecular weight of 700-900, obtained through pyrolysis of high density polyethylene, into a compounding kettle, raising the temperature to 130-180 DEG C, performing uniform stirring, adding 5-30 parts of paraffin, and performing uniform stirring; after raising the temperature of a reaction kettle to 120-160 DEG C, and transferring the mixed liquid into the reaction kettle; and putting an oxidizing agent into the mixed liquid, keeping the temperature in the reaction kettle at 120-160 DEG C, and performing continual stirring till the acid value is 10-30 to obtain modified special oxidized polyethylene wax. The physical and chemical properties of the oxidized polyethylene wax are within the index range, and as the rheological additive of the coating, the prepared modified special wax has excellent rheological properties and good matting property and storage stability, causes no influence on the color and the clarity of the coating, and has strong scratch resistance.

Description

technical field [0001] The invention discloses a method for preparing a special wax modified by a rheology additive for a solvent-based coating, which belongs to the technical field of coating additives. Background technique [0002] Paint is a kind of material that can form a coating film for coating the surface of an object, thereby playing a role in protection, decoration, marking and other special functions. Therefore, it is more and more widely used in industry, agriculture, scientific research, national defense and people's life . Rheological additives are important additives in paints. Although the amount added is not large, the effect is obvious. It not only affects the apparent viscosity of the paint, but also has a great impact on the thixotropy of the paint. It also has orientation to the pigment and prevents the pigment from settling. [0003] The purpose of using rheological additives is to facilitate the adjustment of the viscosity of different fluids: such as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/65C09D7/42C08F10/02C08F8/50C08F8/06
CPCC08F8/06C08F8/50C09D7/65C08F10/02
Inventor 齐峰全齐峰国王玉侠孔德强张宇峰孙强
Owner 淄博市临淄齐泉工贸有限公司