The invention provides a low-expansion coefficient
polyvinyl chloride alloy material and a manufacturing method thereof. The ingredients of raw materials of the
alloy material comprise a
polyvinyl chloride substrate, a heat-resistant modifier, a heat stabilizer, a lubricator, a filler and a
processing agent, and the
alloy material is manufactured by a
melt blending technique. The
processing agent and the filler in the ingredients of the raw materials of the invention are the
processing agent that is subjected to modification by a new method and the filler that is subjected to organic treatment, and by means of a mechanochemical reaction, self-plastification,
toughening and reinforcement of the PVC can be combined organically to improve compatibility and
dispersity of the
polyvinyl chloride, the filler and heat-resistant resin, thus
settling the problem about the contraction between the improvement of heat expansion performance and
heat resistance of the PVC, and processing performance, strength and
toughness of the PVC; the polyvinyl
chloride engineering plastic with low expansion coefficient,
high heat resistance, high strength, high
toughness, excellent
aging resistance and outstanding processing performance is manufactured; the invention has extensive
industrial market prospect and the manufacturing method thereof is simple in technology, convenient in operation and control, stable in quality and high in production efficiency.