A kind of pvc tubing containing modified coal ash and preparation method thereof
Technical field
The present invention relates to pvc tubing production field, particularly relate to a kind of pvc tubing containing modified coal ash and preparation method thereof.
Background technology
The major ingredient of pvc tubing is polyvinyl chloride, add softening agent in addition, the auxiliary materials such as antiaging agent increase its thermotolerance, toughness, ductility etc., pvc is liked by the world today deeply, the rather popular and a kind of synthetic materials be also widely used, PVC is a kind of tubing of maturation, be mainly used in water supply and sewage work, pvc tubing has acidproof, alkaline-resisting, erosion resistance, intensity advantages of higher, but, at present large step point production manufacturer production pvc tubing shock resistance out bad, especially the plasticizing process in the processing of PVC product, the dispersion of inorganics and the processing fluidity of pvc melt are difficult problems always.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, a kind of pvc tubing containing modified coal ash and preparation method thereof is provided.
For achieving the above object, the present invention adopts following technical scheme:
Pvc tubing containing modified coal ash, the weight part of its constitutive material is: SG-5 type polyvinyl chloride resin 50-55, bisphenol A polycarbonate 40-45, poly-4-methyl-1-pentene 0.8-1.2, ferrocene 2-4, ethylene group two hard esteramides 1.4-1.8, lead sulfate tribasic 1.3-1.5, modified coal ash 1-2, titanium dioxide 35-38, antioxidant 1010 1.4-1.6, epoxidation tri-glyceride 0.5-0.7 and anilinomethyl triethoxysilane 0.9-1.1.
Pvc tubing containing modified coal ash, the weight part of its constitutive material is: SG-5 type polyvinyl chloride resin 52, bisphenol A polycarbonate 42, poly-4-methyl-1-pentene 1, ferrocene 3, ethylene group two hard esteramides 1.6, lead sulfate tribasic 1.4, modified coal ash 1.5, titanium dioxide 36, antioxidant 1010 1.5, epoxidation tri-glyceride 0.6 and anilinomethyl triethoxysilane 1.
The preparation method of the pvc tubing containing modified coal ash, comprises the following steps:
(1) each raw material is taken by the weight part of constitutive material, mix in pot in heat and add SG-5 type polyvinyl chloride resin and bisphenol A polycarbonate, heating 2-3 minute, then poly-4-methyl-1-pentene, ferrocene, ethylene group two hard esteramides, lead sulfate tribasic, modified coal ash, titanium dioxide, antioxidant 1010, epoxidation tri-glyceride and anilinomethyl triethoxysilane is added successively, reaction 5-7 minute;
(2) then join in parallel double-screw extruder and carry out melt blending and namely granulation obtains stuff and other stuff, extruder barrel temperature is 165-175 DEG C, and die head temperature is 183-218 DEG C, and screw speed is 500-550rpm;
(3) adopt conical double screw extruder by shaping for the stuff and other stuff extruding pipe material of gained, obtain the pvc tubing containing modified coal ash, extruder barrel temperature is 180-200 DEG C, and die head temperature is 185-210 DEG C.
The preparation method of described modified coal ash is: flyash is put into 13-15% sodium hydroxide solution and soak after 2-3 hour, pull out, dry at 53-58 DEG C of temperature to water content 2-3%, after add the whiteruss being equivalent to its weight 3-4% immediately and mix, then, add the aluminium hydroxide being equivalent to its weight 5-8%, sec.-propyl three (dioctylphyrophosphoric acid acyloxy) titanic acid ester of 5-8%, the tripoly phosphate sodium STPP of 1-2%, the iron ore tailings of 3-4%, mix, at 60-70 DEG C, 3500-4000 rev/min is stirred 30-50 minute, mixing, oven dry is ground to 1.0-1.2 μm of powder, obtain modified coal ash.
Advantage of the present invention:
The present invention, by optimizing further formula, with the addition of modified coal ash composition, makes the dispersion that can promote mineral filler in the course of processing of pvc tubing in formula, improve the mobility of pvc melt, tensile strength and elongation at break can also be promoted, good toughness, the shortcoming that hardness is low; And preparation method is simple, can effectively be applied in all trades and professions.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment 1: the pvc tubing containing modified coal ash, the weight part (kilogram) of its constitutive material is: SG-5 type polyvinyl chloride resin 52, bisphenol A polycarbonate 42, poly-4-methyl-1-pentene 1, ferrocene 3, ethylene group two hard esteramides 1.6, lead sulfate tribasic 1.4, modified coal ash 1.5, titanium dioxide 36, antioxidant 1010 1.5, epoxidation tri-glyceride 0.6 and anilinomethyl triethoxysilane 1.
The preparation method of the pvc tubing containing modified coal ash, comprises the following steps:
(1) each raw material is taken by the weight part of constitutive material, mix in pot in heat and add SG-5 type polyvinyl chloride resin and bisphenol A polycarbonate, heating 2-3 minute, then poly-4-methyl-1-pentene, ferrocene, ethylene group two hard esteramides, lead sulfate tribasic, modified coal ash, titanium dioxide, antioxidant 1010, epoxidation tri-glyceride and anilinomethyl triethoxysilane is added successively, reaction 5-7 minute;
(2) then join in parallel double-screw extruder and carry out melt blending and namely granulation obtains stuff and other stuff, extruder barrel temperature is 165-175 DEG C, and die head temperature is 183-218 DEG C, and screw speed is 500-550rpm;
(3) adopt conical double screw extruder by shaping for the stuff and other stuff extruding pipe material of gained, obtain the pvc tubing containing modified coal ash, extruder barrel temperature is 180-200 DEG C, and die head temperature is 185-210 DEG C.
The preparation method of modified coal ash is: put into by flyash after 15% sodium hydroxide solution soaks 3 hours, pull out, dry at 53-58 DEG C of temperature to water content 3%, after add the whiteruss being equivalent to its weight 4% immediately and mix, then, add the aluminium hydroxide being equivalent to its weight 8%, sec.-propyl three (dioctylphyrophosphoric acid acyloxy) titanic acid ester of 5%, the tripoly phosphate sodium STPP of 1%, the iron ore tailings of 4%, mix, at 60-70 DEG C, 3500-4000 rev/min is stirred 30-50 minute, mixing, oven dry is ground to 1.0-1.2 μm of powder, obtain modified coal ash.
The contrast verification test result of the pvc tubing that above-described embodiment obtains is as following table:
Sequence number |
Test item and unit |
QB/T2480 index |
Common pvc tubing |
Sample in this enforcement |
1 |
Outward appearance |
Inside and outside wall should be smooth, without surface imperfection such as depression and decomposition variable color lines |
Inside and outside wall is smooth, without surface imperfection such as depression and decomposition variable color lines |
Inside and outside wall is smooth, without surface imperfection such as depression and decomposition variable color lines |
2 |
Tensile strength, Mpa |
≥43 |
43 |
56.5 |
3 |
Elongation at break, % |
≥80 |
105 |
117 |
4 |
Longitudinal welds, % |
≤3.5 |
3.1 |
1.4 |
5 |
Vicat softening temperature, DEG C |
≥75 |
83 |
92 |
6 |
Falling weight impact test (20 DEG C, 2kg, 2m), TIR |
≤10% |
5.5 |
1.45 |