The invention provides a composite thermal insulating strip for building
doors and windows and a preparation method of the composite thermal insulating strip, and relates to the field of
thermal insulation strips. The composite thermal insulating strip comprises the following raw materials in parts by weight: 75-80 parts of nylon resin, 10-15 parts of
epoxidized soybean oil, 5-9 parts of epoxidized
fatty acid methyl ester, 5-9 parts of a propylene-
ethylene grafted
copolymer, 15-20 parts of glassfiber, 15-20 parts of
sepiolite fiber, 8-15 parts of
basalt fiber, 7-12 parts of nanometer titania,8-12 parts of nano
mica powder, 3-7 parts of color master batch, 3-7 parts of
phosphate ester, 2-5 parts of sub
phosphate ester, 1.8-2.8 parts of an
antioxidant, 2.5-4.2 parts of a
lubricant, and 1.2-2.5 parts of a
silane coupling agent. Through the synergistic effect of
raw material components, the composite
thermal insulation strip has the advantages that the mechanical
toughness is high, the tensile resistance and the break resistance are high, the heat
conductivity coefficient is low, and the composite thermal insulating strip has high
thermal insulation resistance and durability.