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Defoaming master batch for rotational molding and preparation method thereof

A defoaming and master batch technology, applied in the field of plastic processing, can solve the problems of inability to completely solve bubbles, intensified thermal oxidation of materials, difficult to discharge bubbles, etc., and achieves the effects of scientific and reasonable preparation method, improvement of surface tension and low cost

Active Publication Date: 2014-09-24
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Prolonging the time can discharge the bubbles in the melt to a certain extent, but it will easily lead to the intensification of thermal oxidation of the material, ranging from discoloration, to a decrease in mechanical properties. Raising the temperature can theoretically reduce the viscosity of the melt, which is conducive to the formation of bubbles. Spilled, but still faces degradation issues
It can be seen that prolonging the time and increasing the temperature cannot completely solve the bubble problem, but can only control the bubbles to a certain extent, because there is no pressure on the melt during processing, and it is difficult to discharge the bubbles from the melt by heating

Method used

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  • Defoaming master batch for rotational molding and preparation method thereof

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Comparison scheme
Effect test

Embodiment 1

[0017] The rotomolding defoaming masterbatch one of the present invention, the mass percentage of assembled raw materials is composed of:

[0018] Linear low density polyethylene 72%, 1000-2500 mesh calcium carbonate bubble nucleating agent 16%, dispersant calcium stearate 6%, air bubble release agent erucamide 6%, of which linear low density polyethylene: melt Mass flow rate 2~14g / 10min (2.16kg / 190℃), density 0.926~0.940g / cm 3 .

[0019] Preparation method: Mix and stir the assembled raw materials and then extrude and granulate. The mixing speed is 1000 rpm, the mixing temperature is 40-45°C, the mixing time is 5 minutes, and the screw extruder is used for granulation, and the temperature is 150- 160°C.

Embodiment 2

[0021] The rotomolding defoaming masterbatch two of the present invention, the quality percentage of assembled raw material is composed of:

[0022] Linear low density polyethylene 84%, 1000-2500 mesh clay air bubble nucleating agent 10%, dispersant zinc stearate 3%, air bubble release agent oleic acid amide 3%, of which linear low density polyethylene: melt quality Flow rate 2~14g / 10min (2.16kg / 190℃), density 0.926~0.940g / cm 3 .

[0023] Preparation method: Mix and stir the assembled raw materials and then extrude and granulate. The mixing speed is 1100 rpm, the mixing temperature is 35-40°C, the mixing time is 4 minutes, and the screw extruder is used for granulation, and the temperature is 130- 140°C.

Embodiment 3

[0025] Rotational molding defoaming masterbatch three of the present invention, the quality percentage of assembled raw material is composed of:

[0026] Linear low-density polyethylene 76%, 1200-2300 mesh sieve calcium sulfate bubble nucleating agent 14%, dispersant calcium stearate 5%, bubble release agent oleic acid amide 5%, of which linear low-density polyethylene: melt Mass flow rate 2~14g / 10min (2.16kg / 190℃), density 0.926~0.940g / cm 3 .

[0027] Preparation method: mix and stir the assembled raw materials, extrude and granulate, the mixing speed is 980 rpm, the mixing temperature is 38-42°C, the mixing time is 6 minutes, and the screw extruder is used for granulation, and the temperature is 160- 165°C.

[0028] Mix masterbatch 1, masterbatch 2, and masterbatch 3 with rotomolding resin and perform rotomolding. The properties are shown in Table 1.

[0029] Table 1. Performance table after adding this patented masterbatch (mass parts) during rolling plastic processing ...

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Abstract

The invention relates to a defoaming master batch for rotational molding and a preparation method thereof, belonging to the technical field of plastic processing. The defoaming master batch is prepared by mixing and stirring raw materials in a certain ratio and then extruding and granulating. The defoaming master batch is characterized by containing the following raw materials in percentage by mass: 70-86% of linear low-density polyethylene, 8-18% of bubble nucleating agent, 3-6% of dispersing agent and 3-6% of bubble eliminant. The invention aims to provide a defoaming master batch for rotational molding and a preparation method thereof. The defoaming master batch is low in cost and can solve the problem on bubbles of a rotational molding product; the rotational molding product prepared from the defoaming master batch is free of bubbles and has favorable processability, good plasticization performance, high production efficiency and high product performance; and the preparation method is scientific and reasonable, and is simple and easy to implement.

Description

technical field [0001] The invention relates to a rotational molding defoaming masterbatch and a preparation method thereof, belonging to the technical field of plastic processing. Background technique [0002] In the production of plastics, the existing method of eliminating air bubbles in the product is mainly solved by process improvement, which can be improved by prolonging the heating time and increasing the temperature. Prolonging the time can discharge the bubbles in the melt to a certain extent, but it will easily lead to the intensification of thermal oxidation of the material, ranging from discoloration, to a decrease in mechanical properties. Raising the temperature can theoretically reduce the viscosity of the melt, which is conducive to the formation of bubbles. overflow, but still faces degradation issues. It can be seen that prolonging the time and increasing the temperature cannot completely solve the problem of bubbles, but can only control the bubbles to a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/08C08K3/26C08K3/34C08K3/30C08K5/098C08K5/20C08J3/22
Inventor 张广明张丽霞刘少成张超霍明
Owner CHINA PETROLEUM & CHEM CORP
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