In the prior art, the cable high-temperature heat insulation sleeve comprises an inner liner, a high-temperature heat insulation coating layer dipped on the inner liner and an outer tube braided on the high-temperature heat insulation coating layer, wherein the inner liner is a silicone rubber tube and the outer tube is a glass fiber braided sleeve; The preparation method is that the silicone rubber inner liner is inflated, and then the silicone rubber inner liner is dipped with high temperature resistant insulation coating layer, and then the glass fiber outer tube is woven on the high temperature resistant insulation coating layer after baking. The composite casing with this structure has the following disadvantages.

1. Because the surface of silicone rubber pipe as inner liner is smooth and high temperature coating is very difficult to attach, the phenomenon of separation and blistering of high temperature resistant insulation coating layer and silicone rubber pipe often occurs in the production process, which leads to reverse work or scrap of products, which increases production cost; In addition, the composite sleeve of this structure needs to be inflated during the production process. After the high temperature insulation coating is soaked and deflated, if the silicone rubber pipe is separated from the high temperature insulation coating, the silicone rubber pipe will contract and sink, causing the pipe cavity to be blocked.

2. Because the glass fiber which is used as the outer tube of glass fiber woven sleeve contains a lot of chemical infiltrators, people are prone to handle and skin allergy in the process of use; In addition, because the fiberglass braided sleeve is at 700 ° C-120 (TC is not easy to dissolve and loosen in the hot environment, which affects the foaming and heat insulation effect of the heat insulation coating coated on the inner liner.

      The preparation method of high temperature resistant heat insulation sleeve is to weave the glass fiber woven inner liner, then dip the high temperature insulation coating layer on the woven glass fiber woven inner liner, and then weave the outer tube on the high temperature insulation coating layer after baking. After baking, the aramid fiber woven casing is woven on the heat insulation coating.

      Because glass fiber woven sleeve is used as the skeleton base of inner liner, the adhesion with high temperature insulation coating layer is enhanced by using the uneven appearance of glass fiber woven sleeve, and the separation, blistering and cavity blocking of high temperature insulation coating and silicone rubber inner pipe in the existing technology are effectively solved; Meanwhile, the invention also adopts aramid fiber woven sleeve as outer sleeve, and uses the non-toxic properties of aramid fiber which will not have adverse effect on human and environmental protection, and solves the problems of hand binding and skin allergy when people contact; The aramid fiber will start carbonization at 35 (TC), which can further increase the insulation effect of the product of the invention. Compared with the prior art, it has the advantages of non stratification, no bubble, no blockage in the lumen, good insulation effect, low production cost, no pollution to human and environment, etc., especially suitable for the control equipment of aerospace, aviation and missile weapons.