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Method for regulating mechanical property of polypropylene based on alpha/beta complex nucleating agent

A technology of composite nucleating agent and polypropylene mechanics, which is applied in the field of polypropylene, can solve the problems of decreased tensile and bending properties, and decreased rigidity, so as to achieve the effect of improving tensile strength and avoiding processing tests

Active Publication Date: 2011-05-04
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The β crystal form belongs to the hexagonal crystal system. The polypropylene of this crystal form has good impact toughness, but the rigidity is significantly lower than that of the α crystal form polypropylene.
Often after the addition of β crystal nucleating agent to polypropylene, the impact strength can be greatly improved, but the tensile properties and bending properties will decrease at this time

Method used

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  • Method for regulating mechanical property of polypropylene based on alpha/beta complex nucleating agent
  • Method for regulating mechanical property of polypropylene based on alpha/beta complex nucleating agent
  • Method for regulating mechanical property of polypropylene based on alpha/beta complex nucleating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Select a polypropylene α crystal nucleating agent NA40 and a polypropylene β crystal nucleating agent PA-03; respectively test the influence of the addition concentration of the two on the crystallization temperature of polypropylene, which is recorded as ΔT Cp . See figure 1 , figure 2 ;

[0031] (2) When the total addition concentration of the two nucleating agents is 0.2wt%, according to the ΔT corresponding to the respective addition concentrations of the two nucleating agents Cp , calculate the difference between the two under each composite ratio, and record it as ΔT Cαβ , pick T Cαβ The ratio with the smallest absolute value, NA40:PA-03=3:7 (mass ratio), is the best ratio when the total concentration of the two nucleating agents is 0.2wt%.

[0032] Table 1 ΔT of NA40 / PA-03 in different proportions in polypropylene when the total concentration is 0.2wt% Cαβ Compare

[0033]

[0034] (3) Mix 0.6g NA40 with 1.4g PA-03, add 1000g polypropylene.

Embodiment 2

[0036] (1) Select a polypropylene α-crystal nucleating agent NA40 and a polypropylene β-crystal nucleating agent NABW, respectively test the influence of the addition concentration of the two on the crystallization temperature of polypropylene, denoted as ΔT Cp . See figure 1 , image 3 ;

[0037] (2) When the total addition concentration of the two nucleating agents is 0.2wt%, according to the ΔT corresponding to the respective addition concentrations of the two nucleating agents Cp , calculate the difference between the two under each composite ratio, and record it as ΔT Cαβ , pick ΔT Cαβ The ratio with the smallest absolute value, NA40:NABW=1:3 (mass ratio), is the best ratio when the total concentration of the two nucleating agents is 0.2wt%.

[0038] Table 2 ΔT of NA40 / NABW in polypropylene with different proportions when the total concentration is 0.2wt% Cαβ Compare

[0039]

[0040] (3) 0.5g NA40 was mixed with 1.5g NABW, and 1000g polypropylene was added.

Embodiment 3

[0042] (1) Select a polypropylene alpha crystal nucleating agent S20 and a polypropylene beta crystal nucleating agent PA-03. Test the effect of the added concentration of the two on the crystallization temperature of polypropylene, which is recorded as ΔT Cp ,See Figure 4 , figure 2 ;

[0043] (2) When the total addition concentration of the two nucleating agents is 0.3wt%, according to the ΔT corresponding to the respective addition concentrations of the two nucleating agents Cp , calculate the difference between the two under each composite ratio, and record it as ΔT Cαβ , pick ΔT Cαβ The ratio with the smallest absolute value, S20: PA-03=2: 3 (mass ratio), is the best ratio when the total addition concentration of the two nucleating agents is 0.3wt%;

[0044] Table 3 The ΔT of S20 / PA-03 in polypropylene with different proportions when the total concentration is 0.3wt% Cαβ Compare

[0045]

[0046]

[0047] (3) Mix 1.2g S20 with 1.8g PA-03, add 1000g polyprop...

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Abstract

The invention relates to a method for regulating mechanical property of polypropylene based on alpha / beta complex nucleating agent, in the method, a polypropylene alpha crystal form nucleating agent and a beta crystal form nucleating agent are in complex use, and a new method for finding out optimal complex proportion of the alpha crystal form nucleating agent and the beta crystal form nucleating agent when total addition concentration is certain is provided; namely, difference delta TC alpha beta between the two nucleating agents at each complex proportion delta TCp is calculated, and the proportion in which the two agents have minimum difference is considered as the optimal complex proportion of the addition concentration. The method has the following advantages: when the two crystal forms of polypropylene nucleating agents are added compositely according to the optimal proportion, tensile strength, flexural modulus and impulse strength of the polypropylene can be simultaneously improved. The optimal proportion of any two nucleating agents under a condition that the total addition concentration is certain can be found out through the calculation method, and processing test on each compound proportion is avoided.

Description

【Technical field】 [0001] The invention relates to the technical field of polypropylene, in particular to a method for regulating the mechanical properties of polypropylene based on an α / β composite nucleating agent. 【Background technique】 [0002] As a general-purpose thermoplastic resin, polypropylene has the advantages of low relative density, non-toxicity, heat resistance, corrosion resistance, excellent electrical insulation, high heat distortion temperature, easy processing and low price. It has been widely used in many fields and is still in use Continuously develop new applications. [0003] Isotactic polypropylene is a semi-crystalline resin, and its known crystal forms include α, β, γ, δ and pseudo-hexagonal crystal systems. Among them, the α crystal form is a monoclinic crystal, which is the most stable, but it has the disadvantage of poor toughness. Therefore, the addition of polypropylene α crystal nucleating agent will significantly improve the tensile and ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K13/02
Inventor 辛忠石尧麒
Owner EAST CHINA UNIV OF SCI & TECH
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