Polypropylene beta crystal form compound nucleating agent and preparation method thereof

A technology of polypropylene and β crystal form, which is applied in the field of compound nucleating agent and preparation of polypropylene β crystal form, can solve the problems of poor compatibility of polypropylene and poor effect of improving polypropylene performance, and achieves the promotion of crystallization and organic growth. The effect of ordering and increasing the content of β crystals

Active Publication Date: 2022-05-27
涿州市隽诚化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention proposes a polypropylene β-crystal compound nucleating agent and its preparation method, which solves the problems of poor compatibility between the nucleating agent and polypropylene and poor effect on improving the performance of polypropylene in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Polypropylene beta crystal form compound nucleating agent: N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate, calcium stearate, isotactic polypropylene compound, the mass ratio is 1 :0.4:3:25; N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate and calcium stearate are mixed uniformly and then extruded with isotactic polypropylene to form a master batch.

[0021] Preparation of polypropylene: the above-mentioned polypropylene β crystal compound nucleating agent is added to polypropylene according to 0.1% of the mass of polypropylene, mixed, extruded and pelletized, and obtained by injection molding, wherein during injection molding, the melt temperature is controlled to 200 ° C , the injection rate is 40mm s -1 , injection pressure and holding pressure 40MPa, holding time 32s.

[0022] The β-crystal content is calculated by DSC test, the impact strength is based on GB / T1843-2008 for notched Izod impact strength, and GB / T 1634-2019 for thermal defo...

Embodiment 2

[0026] Polypropylene beta crystal form compound nucleating agent: N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate, calcium stearate, isotactic polypropylene compound, the mass ratio is 1 :0.3:2:20; N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate and calcium stearate are mixed uniformly and then extruded with isotactic polypropylene to form a master batch.

[0027] Preparation of polypropylene: the above-mentioned polypropylene β crystal compound nucleating agent is added to polypropylene according to 0.1% of the mass of polypropylene, mixed, extruded and pelletized, and obtained by injection molding, wherein during injection molding, the melt temperature is controlled to 200 ° C , the injection rate is 50mm s -1 , injection pressure and holding pressure 42MPa, holding time 30s.

[0028] Table 2 embodiment 2 experimental data

[0029] β crystal content Impact strength (kJ / m 2 )

Embodiment 3

[0031] Polypropylene beta crystal form compound nucleating agent: N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate, calcium stearate, isotactic polypropylene compound, the mass ratio is 1 :0.5:4:30; N'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate and calcium stearate are mixed uniformly and then extruded with isotactic polypropylene to form a master batch.

[0032] Preparation of polypropylene: the above-mentioned polypropylene β-crystal compound nucleating agent is added to polypropylene according to 0.1% of the mass of polypropylene, mixed, extruded and granulated, and obtained by injection molding, wherein during injection molding, the melt temperature is controlled to 210 ° C , the injection rate is 45mm s -1 , injection pressure and holding pressure 42MPa, holding time 31s.

[0033] Table 3 embodiment 3 experimental data

[0034] β crystal content Impact strength (kJ / m 2 )

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Abstract

The invention relates to the technical field of polypropylene nucleating agents, and provides a polypropylene beta crystal form compound nucleating agent which is formed by compounding N 'N-dicyclohexyl terephthalamide, polyethylene cyclophthalate, calcium stearate and isotactic polypropylene. The invention also provides a preparation method of the polypropylene beta crystal form compound nucleating agent. According to the technical scheme, the problems that in the prior art, a nucleating agent is poor in compatibility with polypropylene, and the effect of improving the performance of the polypropylene is poor are solved.

Description

technical field [0001] The invention relates to the technical field of polypropylene nucleating agents, in particular to a compound nucleating agent of polypropylene beta crystal form and a preparation method. Background technique [0002] Polypropylene (PP) has five crystal structures, α, β, γ, δ and pseudo-hexagonal. The stable α structure is formed under standard process conditions, and due to β-PP impact performance and high service temperature, it is resistant to long-term Creep and ductility are strong, so it has received more attention, and the way to promote the formation of β crystal structure of polypropylene is to add special nucleating agents. [0003] At present, there are several types of nucleating agents for polypropylene beta crystal form: fused ring compounds, dicarboxylic acid compounds, aromatic amine compounds, and rare earth compounds. Among them, aromatic amine compounds are relatively mature as nucleating agents, but they are expensive, and most of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/22C08L23/12C08K5/20C08K5/098
CPCC08J3/223C08J2323/12C08J2423/12C08J2425/18C08K5/20C08K5/098Y02P20/52
Inventor 任泽群
Owner 涿州市隽诚化工有限公司
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