A high-melt strength impact-resistant polypropylene foam material and its preparation method
A high-melt-strength, foaming material technology, applied in the field of polymers, can solve the problems of material melting and extrusion difficulties, not easy to uniform and fine cells, and lower melt strength, etc., to achieve controllable expansion ratio and smooth surface The effect of good degree and high foaming ratio
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preparation example 1
[0089] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.
[0090] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.
[0091] (1) Prepolymerization reaction
[0092] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (isopropylcyclopentyldimethoxysilane, IPCPMS) were After pre-contacting at 6°C for 20 minutes, it is continuously fed into a continuous stirred tank prepolymerization reactor for prepolymerization. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of isopropylcyclopentyldimethoxysilane is 0.3g / hr, the f...
preparation example 2
[0100] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.
[0101] The catalyst used, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Preparation Example 1. The difference with Preparation Example 1 is that the second external electron donor is changed to 2,-isopropyl-2-isopentyl-1,3-dimethoxypropane (IPPMP), and the addition amount remains unchanged, and the second The amount of hydrogen in the second reactor in the stage was adjusted to 4000ppm. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.
[0102]
[0103] From the results shown in Table 1 and Table 2, it can be seen that the polypropylene material prepared by the method of the present invention has high melt strength, high tensile strength, flexural modulus, and notched impact strength. Therefore, the impact polypropy...
Embodiment 1
[0106] The polypropylene particles prepared in Preparation Example 1 were kneaded by a twin-screw extruder, shaped by a die, cooled and cut off to make a 20cm*20cm*1cm polypropylene board to be expanded. The mold installed between the molding presses was heated up to 153° C., the polypropylene plate was put into it, the molding presses were closed, and the molds were sealed. Feed 10MPa supercritical carbon dioxide into the mold, so that the supercritical carbon dioxide diffuses into the polypropylene matrix at 153°C and 10MPa. After 30 minutes of saturation, the diffusion equilibrium is reached, and then the mold is opened to release the pressure to normal pressure for foaming, the foamed board pops up, cooled and shaped, and a polypropylene foamed board with an external dimension of 60.8cm*60.8cm*3.1cm is obtained. . Test its foaming ratio, and analyze its internal cell shape by scanning electron microscope. Its performance is shown in Table 3.
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