Halogen-free flame-retardant adhesion-proof heat-shrinkable bush and preparation method thereof
A heat-shrinkable sleeve and anti-sticking technology, which is applied in the field of halogen-free flame retardant and anti-sticking heat-shrinkable sleeve and its preparation, can solve the problems of short service life and poor flame retardant performance of the heat-shrinkable sleeve, and achieves high resistance to The effect of good dripping performance, good anti-sticking performance and low smoke emission
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[0040] The preparation method of the above-mentioned halogen-free flame-retardant anti-sticking heat-shrinkable sleeve includes the following steps:
[0041] Step 1: Take vinyl polymer by weight, 100 parts; red phosphorus, 20-40 parts; flame retardant, 50-80 parts; antioxidant, 0.5-3 parts; lubricant, 0.5-3 parts; Masterbatch, 5~8 parts;
[0042] Step 2: After mixing and granulating with an internal mixer or a parallel twin-screw extruder, extrude into a pipe with a single-screw extruder;
[0043] Step 3: The pipe is cross-linked by cobalt 60 or electron accelerator 50-160KGy radiation, and the pipe after radiation cross-linking is expanded 2-4 times at a temperature of 85-135°C.
preparation Embodiment 1
[0045] Weigh each according to the weight listed in the table below.
[0046]
[0047] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.
[0048] The pipe is cross-linked by cobalt 60 radiation at 50KGy, and the cross-linked pipe expands 2.5 times at a temperature of 135°C to obtain a halogen-free flame-retardant anti-sticking heat-shrinkable sleeve, and its properties are as follows.
[0049] Flame retardancy: passed the vw-1 flame retardancy test.
[0050] The tensile strength is 13.7MPa, and the elongation at break is 440.32%.
[0051] Halogen-free flame-retardant anti-adhesive heat-shrinkable sleeves for automotive steel pipes are limited and side-by-side. After shrinking and cooling to room temperature, they are separated by two opposite forces. The surface of the heat-shrinkable sleeve has no indentation, no deformation, and no stickiness.
[0052] After aging at 158℃ / 300h, the ten...
preparation Embodiment 2
[0055]
[0056] The above-mentioned materials are mixed and granulated by an internal mixer, and then extruded into pipes by a single-screw extruder.
[0057] The pipe is cross-linked by cobalt 60 radiation at 50KGy, and the cross-linked pipe expands 2.5 times at a temperature of 135°C to obtain a halogen-free flame-retardant anti-sticking heat-shrinkable sleeve, and its properties are as follows.
[0058] Flame retardancy: passed the vw-1 flame retardancy test.
[0059] The tensile strength is 16.83MPa, and the elongation at break is 471.50%.
[0060] Halogen-free flame-retardant anti-adhesive heat-shrinkable sleeves for automotive steel pipes are limited and side-by-side. After shrinking and cooling to room temperature, they are separated by two opposite forces. The surface of the heat-shrinkable sleeve has no indentation, no deformation, and no stickiness.
[0061] After aging at 158℃ / 300h, the tensile strength is 9.43MPa, and the elongation at break is 230.75%.
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