Dissertation > Industrial Technology > General industrial technology > Materials science and engineering > Special structural materials

Preparation and Properties of LDPE, EVA, EPDM Modified EPM Foam Materials

Author ZhuangJiangQiang
Tutor ZhangHuaJi
School Fujian Normal University
Course Polymer Chemistry and Physics
Keywords EPM LDPE EVA EPDM Modified clay Mixing plasticizing Molded foam Modified EPM foaming material
CLC TB383.4
Type Master's thesis
Year 2010
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EPM basic raw materials , LDPE, EVA, EPDM modified materials , rare earth aluminum -modified clay filler plasticizing , mixing two - roll mill , molded foam method of preparing the modified EPM foam . With the intelligent foaming Rotorless analyzed LDPE, EVA, EPDM , EPM optimum cure time ( T90 ) , torque values ??, the foaming gas pressure , using scanning electron microscopy LDPE , EVA , EPDM and other EPM foam the impact of the cell aperture , analysis and testing of the modified EPM foam physical and mechanical properties of LDPE, EVA, EPDM, EAA, AC, DCP content . The results showed that : 4% rare earth aluminum -modified clay , the water absorption time of 326.68s lipophilic degree was 17.8 % , and the emergence of new absorption peak near 2851cm - 1 and 2920 cm - 1 , with 20% change sex clay EPM material physical and mechanical properties ; LDPE content increased , EPM / LDPE curing and foaming process MH , ΔM have different degrees of reduction , 30 parts of LDPE EPM / LDPE foam cell structured , reduce shrinkage ; the EAA content increases , the molded foam process EPM / EVA / EAA blend MH ΔM reduced , T90 extend , when the the EAA addition amount of 20 parts , foamed material 58.3% increase in tear strength , tensile strength 12.0 % ; when the EPDM content of 20 parts of EPM / EPDM material T90 extended to 77s, the gel fraction , elongation at break , tensile strength, tear strength are best shrinkage and high density ; EPM / EPDM foamed material obtained at a temperature of 453K ( 180 ° C ) , smooth skin , good performance , the rate of crosslinking reaction and a blowing agent decomposition reaction rate than v : r = 0.58 ; optimum formulation was prepared EPM / EPDM foam materials , the tensile strength of 2.66MPa, elongation at break of 599.7% , right-angled tearing strength of 11.023 KN / m, 2.5% shrinkage , excellent physical and mechanical properties .

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