A kind of composite polyethylene material and preparation method thereof
Technical field
The invention belongs to polymeric material field, particularly a kind of composite polyethylene material and preparation method thereof.
Background technology
Wrapping material are mainly for the manufacture of packaging vessel, packages printing, packed and transported etc., according to material, mainly contain the main wrapping material such as metal, plastics, glass, pottery, paper, filamentary material, matrix material, according to different demands, wrapping material mainly need to possess thin thickness, appearance transparent, nontoxic, tasteless, security is good, easy to use, and the relaxation shrinkage that anti-buffer intensity is high, good, scrath resistance, anti-tear performance is good and Performance Ratio is high.
Polyethylene is to be polymerized by vinyl monomer, because of its molecular weight height, chain structure difference, can be divided into high density polyethylene(HDPE), Low Density Polyethylene and linear low density polyethylene.Low Density Polyethylene density is lower, and softness is good, mainly as polythene bag, film for agricultural use etc.High density polyethylene(HDPE) has good resistance toheat, can intercept greasy dirt and steam.LLDPE is the multipolymer that ethene and a small amount of senior Α-alkene are polymerized under catalyzer exists.Due to poly these features, become the research focus of thin-film material.
Summary of the invention
The invention provides a kind of composite polyethylene material and preparation method thereof, composite polyethylene material of the present invention has good electrical insulating property, mechanical strength, shock resistance and cold tolerance, can and prolong the technological formings such as pressure by blowing, injection moulding, make after film article, its surface luster is good, has overcome low-temperature flexibility and the larger problem of fragility of original polythene material.
Object of the present invention can be achieved through the following technical solutions:
A composite polyethylene material, by the component that comprises following weight part, made:
Polyethylene 70-85 part,
Polyvinyl alcohol 20-25 part,
Polyoxymethylene 12-20 part,
Stearin 5-8 part,
Zinc oxide 5-12 part,
Tartrate 1-3 part,
Vulcabond 0.5-3 part.
Described polyethylene is selected from one or more in Low Density Polyethylene, high density polyethylene(HDPE) and linear low density polyethylene.
The mass ratio of described Low Density Polyethylene, high density polyethylene(HDPE) and linear low density polyethylene is 5:1:1.
A preparation method for composite polyethylene material, the method comprises the following steps:
(1) by polyethylene, polyvinyl alcohol, polyoxymethylene and zinc oxide at 78-88 ℃, dry, standby;
(2) take polyethylene 70-85 part, polyvinyl alcohol 20-25 part, polyoxymethylene 12-20 part, zinc oxide 5-12 part, tartrate 1-3 part and vulcabond 0.5-3 part, add in reactor, pass into nitrogen, under 0.5-0.8atm, at heating 100-115 ℃, reaction 5-8 hour, in nitrogen environment, is cooled to room temperature;
(3) product in step 2 being regulated to pH is 7, adds stearin 5-8 part, stirs, ultrasonic, obtains composite polyethylene material.
Stir speed (S.S.) in described step 3 is 320 revs/min.
Ultrasonic time in described step 3 is 30-50 minute.
compared with prior art, beneficial effect of the present invention:
Composite polyethylene material of the present invention is owing to having good electrical insulating property, mechanical strength, shock resistance and cold tolerance adding of polyoxymethylene and polyvinyl alcohol, can and prolong the technological formings such as pressure by blowing, injection moulding, make after film article, its surface luster is good, low-temperature flexibility and the larger problem of fragility of original polythene material have been overcome, the composite polyethylene material making has high-modulus, counter-bending and stress cracking resistance, the advantage such as under low temperature resistance to impact shock is better.When the present invention is obtained mass ratio that Low Density Polyethylene, high density polyethylene(HDPE) and linear low density polyethylene drop into and is 5:1:1 by optimization, the advantages such as material has high performance ratio, and simultaneously appearance transparent, relaxation shrinkage, scrath resistance, anti-tear performance that anti-buffer intensity is high, good be good.
Embodiment
Below in conjunction with embodiment, the present invention is further illustrated.
Embodiment 1
(1) by polyethylene, polyvinyl alcohol, polyoxymethylene and zinc oxide at 78 ℃, dry, standby;
(2) take Low Density Polyethylene 70kg, polyvinyl alcohol 20kg, polyoxymethylene 20kg, zinc oxide 5kg, tartrate 3kg and vulcabond 0.5kg, add in reactor, pass into nitrogen, under 0.7atm, heat 100 ℃ at, react 6 hours, in nitrogen environment, be cooled to room temperature;
(3) product in step 2 being regulated to pH is 7, adds stearin 5kg, stirs with 320 revs/min, ultrasonic 50 minutes, obtains composite polyethylene material.
The performance test results that makes composite polyethylene material is as shown in table 1.
Embodiment 2
(1) by Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, polyvinyl alcohol, polyoxymethylene and zinc oxide at 88 ℃, dry, standby;
(2) take Low Density Polyethylene 60.7kg, high density polyethylene(HDPE) 12.1kg and linear low density polyethylene 12.1kg, polyvinyl alcohol 25kg, polyoxymethylene 16kg, zinc oxide 12kg, tartrate 2kg and vulcabond 2kg, add in reactor, pass into nitrogen, under 0.5atm, at heating 115 ℃, react 8 hours, in nitrogen environment, be cooled to room temperature;
(3) product in step 2 being regulated to pH is 7, adds stearin 6kg, stirs with 320 revs/min, ultrasonic 40 minutes, obtains composite polyethylene material.
The performance test results that makes composite polyethylene material is as shown in table 1.
Embodiment 3
(1) by Low Density Polyethylene, high density polyethylene(HDPE), linear low density polyethylene, polyvinyl alcohol, polyoxymethylene and zinc oxide at 80 ℃, dry, standby;
(2) take Low Density Polyethylene 57.1kg, high density polyethylene(HDPE) 11.4kg, linear low density polyethylene 11.4kg, polyvinyl alcohol 22kg, polyoxymethylene 12kg, zinc oxide 7kg, tartrate 1kg and vulcabond 3kg, add in reactor, pass into nitrogen, under 0.8atm, at heating 110 ℃, react 5 hours, in nitrogen environment, be cooled to room temperature;
(3) product in step 2 being regulated to pH is 7, adds stearin 8kg, stirs with 320 revs/min, ultrasonic 30 minutes, obtains composite polyethylene material.
The performance test results that makes composite polyethylene material is as shown in table 1.
The thickness of test sample is 4mm, and length is 200mm, and width is 10mm.
Table 1
| Test event |
Embodiment 1 |
Embodiment 2 |
Embodiment 3 |
| Tensile strength (MPa) |
89 |
102 |
105 |
| Flexural strength (MPa) |
98 |
112 |
108 |
The invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.