Application of HFC-365mfc/227ea Instead of HCFC-141b in Rigid Polyurethane Foam Spray
This paper uses the HFC-365mfc/227ea mixed foaming agent to replace HCFC-141b,produces a low-density external adiabatic protective layer of rigid polyurethane foam by spraying technology,and studies the dosage of the foaming agent,foam performance and foam dimension stability.The results are as follows.When the density,me-chanical strength and thermal conductivity of foam meet the technical requirements of the outer adiabatic protective layer,the dosage of the HFC-365mfc/227ea mixed foaming agent is 38～44 g.When the density of the foam prepared by the HFC-365mfc/227ea mixed foaming agent is similar to that of HCFC-141b,the dosage of the foaming agent is about 25%higher than that of HCFC-141b,with the compressive strength and modulus of the foam 15%higher than those of HCFC-141b,its shear strength and modulus 50%higher,and its thermal conductivity 10%lower.The foam prepared by the HFC-365mfc/227ea mixed foaming agent has good dimensional stability and the dimensional change rate does not exceed 1%in the service temperature temperature range of no more than 80℃.
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