Composite telescopic hose and preparation method thereof
A composite telescopic hose and method for preparing the same. The composite telescopic hose includes an inner tube having the following raw materials in parts by weight: 20-50 parts of SEBS; 40-70 parts of a white oil; 3-15 parts of polypropylene; 3-12 parts of ethylene propylene diene monomer; 0.05 to 0.3 parts of an antioxidant; and 0.2-0.8 parts of an ultraviolet absorber. The inner tube of the composite telescopic hose is made of a material which has superior physical properties, high elongation at break and tensile strength, and can maintain structural integrity under extreme conditions, which significantly improve durability and service life of the product, and reduce maintenance cost. A synergistic composite formulation optimizes physical and mechanical properties of the material of the inner tube at a molecular level, achieving a balance between flowability, stability and mechanical properties, thereby ensuring that the hose performs well under various operating conditions.
1 . A composite telescopic hose, comprising an inner tube and an outer tube, wherein the inner tube comprises the following raw materials in parts by weight:
20-50 parts of SEBS;
40-70 parts of a white oil;
3-15 parts of polypropylene;
3-12 parts of ethylene propylene diene monomer;
0.05 to 0.3 parts of an antioxidant; and
0.2-0.8 parts of an ultraviolet absorber.
2 . The composite telescopic hose according to claim 1 , wherein the inner tube comprises the following raw materials in parts by weight:
30-40 parts of SEBS;
50-60 parts of a white oil;
5-10 parts of polypropylene;
5-10 parts of ethylene propylene diene monomer;
0.1 to 0.2 parts of an antioxidant; and
0.3-0.5 parts of an ultraviolet absorber.
3 . The composite telescopic hose according to claim 1 , wherein the white oil is at least one of white oil No. 3, white oil No. 5, white oil No. 7, white oil No. 10, white oil No. 15, white oil No. 26, white oil No. 32, white oil No. 36, white oil No. 46, white oil No. 68, white oil No. 100, white oil No. 150 and white oil No. 200.
4 . The composite telescopic hose according to claim 3 , wherein the white oil is at least one of white oil No. 7, white oil No. 10, white oil No. 15, white oil No. 26, white oil No. 32, white oil No. 36, white oil No. 46, white oil No. 68 and white oil No. 100.
5 . The composite telescopic hose according to claim 1 , wherein the inner tube is prepared by the following steps:
(1) stirring and mixing the SEBS and the white oil at 500-1500 rpm for 5-15 minutes, taking out and standing for 12-24 hours to obtain oil-extended SEBS;
(2) mixing the oil-extended SEBS, the polypropylene, the ethylene propylene diene monomer, the antioxidant and the ultraviolet absorber to obtain a mixture;
(3) adding the mixture to a twin screw extruder for pelletizing; and
(4) making the inner tube.
6 . The composite telescopic hose according to claim 5 , wherein the step (2) comprises stirring and mixing the oil-extended SEBS, the polypropylene, the ethylene propylene diene monomer, the antioxidant and the ultraviolet absorber at 300-800 rpm for 15-45 minutes to obtain the mixture.
7 . A method for preparing the composite telescopic hose according to claim 1 , comprising the following steps:
a. preparing an outer tube and an inner tube, wherein the outer tube is intended to wrap the inner tube, and the inner tube is intended to transport a medium;
b. sheathing a cross braided polyester layer between the inner tube and the outer tube; and
c. integrally forming the inner tube, the polyester layer and the outer tube using a conventional heat fusion technique.