Elastic polyvinylidene fluoride heat-shrinkable sleeve and preparation method thereof
A polyvinylidene fluoride and heat-shrinkable sleeve technology, applied in the field of elastic polyvinylidene fluoride heat-shrinkable sleeve and its preparation, can solve problems such as cracking and whitening, and achieve improved elasticity, good mechanical properties, and low-temperature impact performance. excellent effect
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[0035] The present invention also proposes a method for preparing the elastic polyvinylidene fluoride heat-shrinkable sleeve, comprising the following steps:
[0036] Step 1: According to parts by weight, take 85-95 parts of polyvinylidene fluoride plastic; 5-15 parts of fluororubber elastomer; 1-3 parts of antioxidant; 2-5 parts of auxiliary crosslinking agent; 8 parts; 0.5-2 parts of acid absorbing agent; 2-5 parts of color masterbatch;
[0037] Step 2: The above components are kneaded and granulated by parallel twin-screws, and then extruded into pipes with a single-screw extruder;
[0038] Step 3: The tube is cross-linked by cobalt-60 or electron accelerator 50-100KGy radiation, and the tube after radiation cross-linking is expanded 2-4 times at a temperature of 150-180°C.
preparation Embodiment 1
[0040] Weigh each component according to the weight listed in the table below:
[0041]
[0042]
[0043] The above materials are mixed and granulated by parallel twin-screws, and then extruded into pipes by a single-screw extruder.
[0044] The tube is irradiated and cross-linked by an electron accelerator of 80KGy, and the tube after radiation cross-linking is expanded twice at a temperature of 180°C to obtain an elastic polyvinylidene fluoride heat-shrinkable sleeve, and its properties are as follows:
[0045] Flame retardancy: passed the VW-1 flame retardancy test;
[0046] Tensile strength: 36.8Mpa, elongation at break 413%;
[0047] The elongation at break after 250℃ / 168h high temperature aging is 381%;
[0048] 300℃±3℃ / 4h high temperature impact, no dripping, no cracking;
[0049] -55℃ / 4h low temperature impact without cracking;
[0050] The finished tube has excellent elasticity.
preparation Embodiment 2
[0052] Weigh each component according to the weight listed in the table below:
[0053]
[0054] The above materials are mixed and granulated by parallel twin-screws, and then extruded into pipes by a single-screw extruder.
[0055] The tube is irradiated and cross-linked by an electron accelerator of 80KGy, and the tube after radiation cross-linking is expanded twice at a temperature of 180°C to obtain an elastic polyvinylidene fluoride heat-shrinkable sleeve, and its properties are as follows:
[0056] Flame retardancy: passed the VW-1 flame retardancy test;
[0057] Tensile strength: 44.9Mpa, elongation at break 375%;
[0058] The elongation at break after 250℃ / 168h high temperature aging is 288%;
[0059] 300℃±3℃ / 4h high temperature impact, no dripping, no cracking;
[0060]-55℃ / 4h low temperature impact without cracking;
[0061] The finished tube is elastic.
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