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High melt strength acrylic resin and preparation

A technology of polypropylene resin and high melt strength, which is applied in the field of high melt strength polypropylene resin and its preparation, which can solve the problems of high gel content, decreased mechanical properties, difficult control of polypropylene degradation, etc., and achieve good effect , improved melt strength, and easy implementation

Active Publication Date: 2009-05-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high-melt-strength polypropylene resin avoids the problems of difficult control of polypropylene degradation caused by the introduction of peroxide initiators, high gel content and decreased mechanical properties of the product

Method used

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  • High melt strength acrylic resin and preparation
  • High melt strength acrylic resin and preparation
  • High melt strength acrylic resin and preparation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1 (adding iron dimethyl dithiocarbamate)

[0046] Get 45g original ecological powder (homopolypropylene powder, melt index is 7.1g / 10min), 0.05g trimethylolpropane triacrylate, 0.02g iron dimethyl dithiocarbamate, in high-speed mixer Mix evenly in medium for 20 minutes, add it into the material chamber of the internal mixer, set the temperature at 200°C, rotate at 80 rpm, and discharge with stable torque after 7 minutes of reaction time. The results are shown in Table 1.

Embodiment 2

[0049] Embodiment 2 (add iron dimethyl dithiocarbamate)

[0050] 100 parts by weight of polypropylene (homopolypropylene powder, melt index is 7.1g / 10min), 0.20 parts by weight of iron dimethyl dithiocarbamate, 1.50 parts by weight of trimethylolpropane triacrylic acid The ester is mixed evenly in a high-speed mixer for 20 minutes. Add it to a twin-screw extruder with L / D=40 and Φ of 24 mm. The rotation number of the extruder is set at 240 rpm. The extruder is divided into eight The heating zones are respectively: 175°C, 190°C, 200°C, 220°C, 230°C, 230°C, 230°C, 220°C, extruded and granulated to obtain high melt strength polypropylene resin. The results are shown in Table 1.

Embodiment 3

[0052] Get 45g original ecological powder, (homopolypropylene powder, melt index is 7.1g / 10min) 4.50g ethoxylated trimethylolpropane triacrylate, 0.06g copper dimethyl dithiocarbamate, Mix evenly in a high-speed mixer for 20 minutes, add to the material chamber of the internal mixer, set the temperature at 210°C, rotate at 20 rpm, and discharge with stable torque after 7 minutes of reaction time. The results are shown in Table 1.

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Abstract

The invention relates to a preparation method of high-melt-strength polypropylene. In the method, reactive blending is carried out to polypropylene, monomer with double bonds and dithiocarbamates. The method can significantly improve the melt strength of polypropylene, greatly inhabit the degradation of polypropylene in the reaction process, also greatly decrease the amount of polyfunctional monomer, and save manufacturing cost. The tensile strength can reach 39MPa; the tensile modulus 810MPa; the elongation at break 738 percent; crystallization temperature 113 DEG C to 225 DEG C; the melt index 0.5g / 10min to 2.0g / 10min; the melt strength 16cN to 36cN; and the gel content 0 percent. No bad effect is brought to the processing performance of the melt and the high-melt-strength polypropylene prepared is applicable to application fields, such as foaming, thermoforming, film blowing and extrusion coating and the like.

Description

technical field [0001] The invention relates to a high-melt strength polypropylene resin and a preparation method thereof. Background technique [0002] Polypropylene is a thermoplastic synthetic resin with excellent performance. It has the advantages of small specific gravity, non-toxicity, easy processing, impact resistance and good electrical insulation. It is the product with the best heat resistance among general resins. It is used in the automotive industry and household It has a wide range of applications in electrical appliances, electronics, packaging and building materials and furniture. However, because the molecular chain of polypropylene is basically a linear structure, the softening point is close to the melting point when heated, the melt strength is low, and the sag resistance is poor, which limits its application in the fields of thermoforming, extrusion coating, foaming and blow molding. application. Therefore, improving the melt strength of polypropylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02
Inventor 唐涛邱健张振江姜治伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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