Preparation method of composite antioxidant for better improving yellowing of polymer caused by processing and long-term aging

A compound antioxidant, long-term aging technology, applied in the field of antioxidant compounding, can solve the problems of changing color, poor color complementation, uneven distribution, etc., and achieve the effect of reducing viscosity, preventing sedimentation and agglomeration, and eliminating yellow light.

Inactive Publication Date: 2019-09-24
JIANGSU JIYI NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, antioxidants cannot change the color by structurally destroying the formed chromophores. To solve the problem of polymer coloring caused by chromophores in raw materials, pigments can be used to complement the color. If th

Method used

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  • Preparation method of composite antioxidant for better improving yellowing of polymer caused by processing and long-term aging
  • Preparation method of composite antioxidant for better improving yellowing of polymer caused by processing and long-term aging
  • Preparation method of composite antioxidant for better improving yellowing of polymer caused by processing and long-term aging

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for preparing a compound antioxidant that better improves polymer processing and long-term aging and yellowing, the specific method is as follows:

[0032] (1) First grind phthalocyanine blue and ultramarine blue respectively, and filter with 800-900 mesh filter screen to obtain phthalocyanine blue powder and ultramarine blue powder, and set aside;

[0033] (2) Mix 20g of antioxidant 1010 and 40g of antioxidant 168, heat and stir, gradually raise the temperature to 250°C, then keep it for 30-60min, then lower the temperature to 230°C, stir for 40-50min, and the stirring speed is 1000~1500r / min to obtain the composite antioxidant mixture Ⅰ;

[0034] (3) Weigh 11.25g of calcium stearate, add it to the composite antioxidant mixture I in the above step (2), stir at a temperature of 230°C for 30-40min, mix well, lower the temperature to 200°C, and stir for 40 ~50min to obtain the composite antioxidant mixture II;

[0035] (4) Keep the temperature of the composite ...

Embodiment 2

[0038] All steps (1), (2), (3), (5) in this screening embodiment are exactly the same as all steps (1), (2), (3), (5) in screening embodiment 1, The difference is that in (4) of this screening example, the composite antioxidant mixture II in the above step (3) is ultrasonically treated under ultrasonic waves, the ultrasonic power is 1000-1200W, the frequency is 20KHz, and the temperature is 190-200°C. Add 3.60g of phthalocyanine blue powder in the above-mentioned step (1), and add 0.15g of ultramarine blue powder in the above-mentioned step (1) after the ultrasonic time is 2 to 3min, continue ultrasonic treatment, disperse evenly, and the ultrasonic time is 3 to 4min, and obtain Complex antioxidant emulsion.

[0039]After the above experiments, take 2g of the composite antioxidant granules prepared in each screening example, add them to 1000ml of polypropylene resin emulsion, mix evenly, and inject them at 180-210°C to extrude and granulate to obtain improved Polypropylene re...

Embodiment 3

[0044] A method for preparing a compound antioxidant that better improves polymer processing and long-term aging and yellowing, the specific method is as follows:

[0045] (1) First grind phthalocyanine blue and ultramarine blue respectively, and filter with 800-900 mesh filter screen to obtain phthalocyanine blue powder and ultramarine blue powder, and set aside;

[0046] (2) Mix 22.5g of antioxidant 1010 and 45g of antioxidant 168, heat and stir, gradually raise the temperature to 250°C, then keep it for 30-60min, then lower the temperature to 230°C, stir for 40-50min, the stirring speed 1000~1500r / min, to obtain the composite antioxidant mixture I;

[0047] (3) Weigh 4.5g of calcium stearate, add it to the composite antioxidant mixture I in the above step (2), stir at a temperature of 230°C for 30-40min, mix well, lower the temperature to 200°C, and stir for 40 ~50min to obtain the composite antioxidant mixture II;

[0048] (4) Ultrasonic treatment of the composite antiox...

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Abstract

The invention discloses a preparation method of a composite antioxidant for better improving yellowing of a polymer caused by processing and long-term aging. The composite antioxidant adopts a main antioxidant, an auxiliary antioxidant, a dispersant, an organic pigment, an inorganic pigment as main raw materials for preparation; and the method comprises the following steps: mixing the main antioxidant and the auxiliary antioxidant, performing melting to form a molten liquid, adding the dispersant, performing uniform mixing, performing ultrasonic treatment under ultrasonic waves, adding the organic pigment powder and the inorganic pigment powder, performing uniform dispersion, and finally performing extrusion granulation by using a twin-screw extruder to obtain the composite antioxidant particles. According to the method provided by the invention, the molten liquid of the main and auxiliary antioxidants is compounded with the pigments, the function of the dispersant and the ultrasonic technology are combined, so that the pigment powder is more uniformly dispersed into the molten liquid of the antioxidants, and the content of the pigments in a single composite antioxidant particle is uniform; and the composite antioxidant is compounded with the polymer, so that a color complementary effect of the pigments on coloring of the polymer is improved, and yellowing of the polymer caused by the processing and the long-term aging is effectively improved.

Description

technical field [0001] The invention relates to a preparation method of a composite antioxidant which can better improve polymer processing and long-term aging and yellowing, and belongs to the technical field of antioxidant composites. Background technique [0002] Polymers, such as polypropylene resin, polyethylene resin, EVA, polycarbonate resin, etc., due to structural defects, metal ion residues and other problems caused by the process during synthesis, or damage to the molecular structure during thermal processing, and long-term storage Aging during the process will produce some chromophores, which will cause the color of the polymer to be colored. Among the many chromophores in the polymer, most of them are yellow and also mixed with red or green chromophores. Antioxidants are functional additives to protect polymer processing and long-term aging. They can delay the formation of chromophores caused by polymer aging, thereby avoiding yellowing of polymers. However, an...

Claims

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Application Information

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IPC IPC(8): C08K13/02C08K5/134C08K5/526C08K5/098C08K3/34C08K5/00C08K3/013C08L23/12
CPCC08K3/34C08K5/0041C08K5/0091C08K5/098C08K5/1345C08K5/526C08K13/02C08L2201/08C08K3/013C08L23/12
Inventor 郭骄阳赵崇鑫
Owner JIANGSU JIYI NEW MATERIAL CO LTD
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