Method for improving nucleation efficiency when preparing beta crystalline long-chain branching polypropylene through beta nucleating agent

A β-nucleating agent and long-chain branching technology, which is applied in the field of polymer material preparation, can solve problems such as insufficient β-crystal content, unstable welding process, and low efficiency of nucleating agents, so as to improve induction efficiency and quality , the effect of reducing dosage

Active Publication Date: 2019-05-28
BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the efficiency of the nucleating agent is low, the amount of the nucleating agent is large, and the β crystal content is not high enough, so the welding process is unstable

Method used

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  • Method for improving nucleation efficiency when preparing beta crystalline long-chain branching polypropylene through beta nucleating agent
  • Method for improving nucleation efficiency when preparing beta crystalline long-chain branching polypropylene through beta nucleating agent
  • Method for improving nucleation efficiency when preparing beta crystalline long-chain branching polypropylene through beta nucleating agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example is divided into three systems, A, B, and C. Among them, system A is pure long-chain branched polypropylene; system B is 100 parts of long-chain branched polypropylene, and 0.9 parts of β-nucleating agent; 100 parts of chain branched polypropylene, 0.9 parts of complex nucleating agent. The grade of long-chain branched polypropylene used is WB140, the β nucleating agent is TMB-5, and the complex nucleating agent is 4A molecular sieve: TMB-5=1:9.

[0034] The above three systems were respectively added into a torque rheometer for melt blending at 190° C., wherein the rotation speed was 60 rads / min, and the blending time was 8 minutes. Then use a differential scanning calorimeter to perform a DSC test. The test condition is: after eliminating the heat history, the temperature is raised from 40°C to 190°C at a rate of 10°C / min. figure 1 is the melting curve of the DSC test, and Table 1 is the relevant statistical data of the DSC test.

[0035] Table 1

[003...

Embodiment 2

[0039] This example is carried out using the same three systems A, B, and C in Example 1.

[0040] After these three systems were melted and kneaded under the conditions in Example 1, they were made into 2mm-thick sheets at 190°C, and the removed part was put into a foaming kettle, and CO 2 , Soaked at 190°C and 10MPa for 2 hours, then cooled the foaming kettle at room temperature, and after cooling down to 160°C-165°C, released the pressure and foamed to obtain a foamed material. Afterwards, a DSC test was carried out using a differential scanning calorimeter, and the test condition was: the temperature was raised from 40° C. to 190° C. at a rate of 10° C. / min. figure 2 is the melting curve of the DSC test, and Table 2 is the relevant statistical data of the DSC test.

[0041] Table 2

[0042]

[0043] Depend on figure 2 It can be seen from the contents of Table 2 that, compared with the unfoamed material in Example 1, the β-crystal melting enthalpy of the foam...

Embodiment 3

[0045] This example contains 4 systems, wherein the first three systems are the same as A, B, and C in Example 1, and the formulation of the fourth system is: 100 parts of long-chain branched polypropylene (WB140), β nucleating agent (TMB-5) 1.2 parts. The mixing method and conditions of the fourth system are the same as those of the first three systems.

[0046] The four systems were placed in foaming kettles respectively, and foamed under the conditions of Example 2. After the foamed material was obtained, it was soaked in liquid nitrogen for 3-4 hours, and a section was obtained after taking it out. structure to observe. image 3 is the cell morphology diagram of the four systems, Table 3 is image 3 Statistical data related to the cell morphology map.

[0047] table 3

[0048]

[0049] Depend on image 3 It can be seen from the content of Table 3 that the addition of nucleating agent does not have much effect on the cell morphology, while the addition of molecular si...

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Abstract

The invention provides a method for improving the nucleation efficiency when preparing beta crystalline long-chain branching polypropylene and a foaming material thereof through a beta nucleating agent. The method includes the step of adding a synergist, and the synergist is combination of one or more of 4A zeolite molecular sieve, 5A zeolite molecular sieve, silicon dioxide and calcium silicate.According to the method for improving the nucleation efficiency when preparing the beta crystalline long-chain branching polypropylene and the foaming material thereof through the beta nucleating agent, the induction efficiency of the beta nucleating agent in the long-chain branching polypropylene can be improved, the content of beta crystals is increased, meanwhile, the amount of the beta nucleating agent can further be decreased, and the cost is saved; and the synergist can improve the nucleation efficiency of the beta nucleating agent and can furtherserve as a bubble nucleating point, the size of cell holes is reduced, the density of the cell holes is increased, and the quality of the foaming material is improved.

Description

technical field [0001] The invention relates to a method for improving the nucleation efficiency when a beta nucleating agent prepares beta crystal long-chain branched polypropylene and its foaming material, and belongs to the technical field of polymer material preparation. Background technique [0002] The properties of polypropylene are significantly related to its crystal structure. Due to the different crystallization conditions, polypropylene can form five crystal forms of α, β, γ, δ and pseudo-hexagonal crystal. Different crystal forms can exist at the same time and can be transformed under certain conditions. The α crystal form is the most stable crystal form, and it is also the most common crystal form, belonging to the monoclinic crystal system. The existence of α crystal form will make polypropylene have relatively large defects in impact toughness, elongation at break, etc. The β crystal form belongs to the hexagonal crystal system and is a metastable thermody...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08K7/26C08K3/36C08K3/34C08K5/20C08J9/12
Inventor 陈士宏王向东江翰川
Owner BEIJING TECHNOLOGY AND BUSINESS UNIVERSITY
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