CN102353618A - Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE) - Google Patents
Method for qualitatively testing molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE) Download PDFInfo
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Abstract
The invention relates to a method for qualitatively testing the molecular weight distribution of ultrahigh molecular weight polyethylene (UHMWPE). In the method, a set of method for comparing and judging the molecular weight distribution of the UHMWPE by combining the limiting viscosity number with kinetic viscosity of a raw material and testing kinetic viscosity by using a rotary viscometer according to the relation between the solubility and molecular weight dependence of the UHMWPE is designed. Compared with the prior art, the method is convenient and easy to operate, and is suitable for qualitatively judging the molecular weight distribution of a contrast sample.
Description
Technical field
The present invention relates to a kind of method of testing of ultra-high molecular weight polyethylene physical property, especially relate to the method for testing that a kind of ultra-high molecular weight polyethylene molecular weight distribution contrasts judgement qualitatively.
Background technology
Ultra-high molecular weight polyethylene (UHMWPE) is meant that viscosity average molecular weigh is at the linear structure tygon more than 1,500,000.Because its molecular chain length, molecular weight is high, has some superior quality that other resin does not have, like shock-resistant, wear-resistant, self-lubricating, resistance to chemical attack, low temperature resistant etc.The main goods of UHMWPE have at present: fiber, sheet material, tubing, bar and finished product (comprise gear, bearing; Axle sleeve, roller, guide rail, slide block, pad and various goods etc.), be widely used in numerous areas such as weaving, papermaking, food, chemical industry, packing, agricultural, building, medical treatment, physical culture, amusement, military affairs.
Molecular weight distribution is meant the relation of each integration content and molecular weight in the polymer sample.Molecular weight and distribution thereof are one of the most basic structural parameters of macromolecular material, and many performances of macromolecular material are with molecular weight and distribute relevant.On the one hand, along with the increase of molecular weight, the pulling strengrth of UHMWPE, heat distortion temperature, wear hardness etc. but increase thereupon; On the other hand, along with the increase of molecular weight, crystallinity, the density of UHMWPE decrease; Its crystallinity is lower than high density polyethylene (HDPE); Therefore, the performance relevant with crystallinity, like density, yield strength, rigidity, hardness, creep-resistant property etc. all not as HDPE.Different molecular weight distributes, and has influence on UHMWPE performance of products and processing.
The method of molecular weight of high polymer and measure of spread thereof is a lot; That uses at present has direct method and an indirect method; Direct method has end-group analysis, boiling point rise method, cryoscopic method, osmometry, light scattering method, ultracentrifugal sedimentation and diffusion method, and indirect method has viscosimetry, gel permeation chromatography (GPC) method, rheology method etc.Use the statistical average meaning of the measured molecular weight of diverse ways to have nothing in common with each other.And, still do not find comparatively ideal sign, the method for testing its molecular weight and distribution thereof at present for UHMWPE.
The entanglement of macromolecular chain is one of key character of superpolymer condensed state, and superpolymer has formed the tangled structure of equal number and intensity in polymerization process, and relevant with the system molecular weight, is called " the born entanglement ".Cardenas and Driscofl introduce the entanglement action model first when handling polymerization; Propose in the no crosslinked free radical polymerization; Chain growth and termination receive the diffusion restriction; When polymerization acquires a certain degree; Molecular chain length reaches critical value and produces entanglement; Influence the strand coefficient of diffusion, Quality Initiative increases and stops.Ito and Boots etc. utilize the snakelike notion of introducing in the entanglement dynamics research; Termination procedure in the polyreaction is redescribed; The chain growth randomness causes strand to twine each other during this explanation polymerization, produces big molecular entanglement when making the macromolecule sample polymerization, i.e. " the born entanglement ".
Macromolecular chain to separate the degree of twining relevant with the concentration of strand form, solution; Have only polymkeric substance in extremely rare solvent; Under the thermal motion of solvent molecule and polymkeric substance overlength molecule and the combined action of external force homogenizing; Dissolving make its overlength strand from nascent state pile up and strand between and multi-level complicated morphosis such as inner entanglements of strand be transformed into to separate and twine macromolecular chain, form the state that does not have entanglement.
Viscosimetry is the analysis and test that carries out the superpolymer viscosity average molecular weigh through the relation between solution viscosity and the molecular weight.UHMWPE has carried out a large amount of experimental studies about the application of viscosimetry.Nineteen fifty-seven, H.S.Kaufman and the E.K.walsh of the U.S. adopted the method for high temperature fractionation to be divided into 7 parts HDPE (0.96), respectively intrinsic viscosity and under 110 ℃, use Et in 130 ℃ tetralin solvent
2C
6H
4Osmometry is measured molecular weight, and the relation that has obtained molecular weight and limiting viscosity is M=2.65 * 10
4[η]
1.32The same year, the L.H.Tung of DOW Chemical also adopted tetralin to record limiting viscosity as solvent at 130 ℃, and recorded molecular weight through osmometry.The relation that obtains molecular weight and limiting viscosity is M=3.40 * 10
4[η]
1.38The R.P.Kusy of American South Ka Lailuona university in 1986 and J.Q.Whitley adopt rising temperature for dissolving to come the classification molecular weight, and record molecular weight distribution curve.The UHMWPE raw material that it adopts is that Hercules company produces the molecular weight of employing and limiting viscosity relational expression M=4.75 * 10
4[η]
1.35Come from the technical report of its company, the figure that obtains meets the theoretical distribution curve.
On the basis of viscosimetry, utilize the molecular weight dependence of polymer dissolution degree, the level that sample is divided into different molecular weight is divided, thereby obtains the molecular weight distribution of sample, the precipitation fractionation method that for example heats up, lowers the temperature.Wherein cool-down method is that the UHMWPE powder is dissolved in the solvent at a certain temperature fully, makes through the decline uniform temperature that high molecular is partially stabilized to be separated out, and separates, and cooling obtains the different molecular weight part repeatedly.With isolated partial vacuum oven dry, measure each several part quality and viscosity average molecular weigh respectively, can obtain the integral distribution curve or the differential distribution curve of molecular weight and running summary of the points scored quality.But the few and difficult collection of different molecular weight amount that this method is separated, test error is big, is difficult to accurately obtain molecular weight distribution curve.
Summary of the invention
The object of the invention be exactly provide in order to overcome the defective that above-mentioned prior art exists a kind of good to unsettled system adaptability, can produce very high strain, be fit to the qualitative test method of the ultra-high molecular weight polyethylene molecular weight distribution of low viscosity system.
The object of the invention can be realized through following technical scheme:
A kind of qualitative test method of ultra-high molecular weight polyethylene molecular weight distribution is characterized in that, this method of testing may further comprise the steps:
(1) take by weighing quantitative ultra-high molecular weight polyethylene to be measured (UHMWPE) powder and place there-necked flask, add solvent then, be adjusted to 0.02g/100ml, install and stir and heating arrangement, stirring and dissolving obtains mixed solution;
(2) take out the partially mixed solution of step (1), use Ubbelohde viscometer to carry out the mensuration of intrinsic viscosity by the viscosity test method of polyolefin lean solution;
(3) with remaining step (1) mixed solution; Utilize NDJ-1 type rotary viscosimeter under different probe temperatures; Adopt No. 1 rotor; The control rotating speed is 60rpm; Measure the kinetic viscosity of mixed solution, each probe temperature, constant temperature certain hour; The kinetic viscosity reading is for write down 3 kinetic viscosity values at interval, and averaged as a result of;
(4) the standard ultra-high molecular weight polyethylene of the identical characteristics viscosity number that records of optional step (2) is a raw material; Adopt the flow process identical to detect the kinetic viscosity result who obtains the standard ultra-high molecular weight polyethylene with above-mentioned steps; The result that step (3) is obtained compares with the kinetic viscosity result of standard ultra-high molecular weight polyethylene, obtains the judged result qualitatively of the molecular weight distribution of ultra-high molecular weight polyethylene to be measured.
The viscosity average molecular weigh of the ultra-high molecular weight polyethylene to be measured described in the step (1) is 100-1000 ten thousand.
Solvent described in the step (1) is mineral oil, white oil, saxol, kerosene, naphthane or decahydronaphthalene, and wherein containing weight ratio in the solvent is 0.1% antioxidant.
Described antioxidant is one or more in phenolic antioxidant, the hindered phenol antioxygen.
The viscosity test method of the polyolefin lean solution described in the step (2) is to measure the method for polyolefin dilute solution viscosity according to ISO 1628-3:2001.
Probe temperature described in the step (3) is 70-170 ℃, and the temperature difference classification intensification with 2-10 ℃ during test is tested mixed solution.
Constant temperature time described in the step (3) is 10-15min.
Standard ultra-high molecular weight polyethylene described in the step (4) is that the trade mark of Ticona company is the ultra-high molecular weight polyethylene of GUR4020, GUR4022, GUR4032, GUR4152 or GUR4170 or MII, MIII or the MIV raw materials that Beijing helps two productions.
The present invention is with the rare solution of powdery UHMWPE preparation poling; Make solvent molecule and polyethylene overlength molecule under the comprehensive function of warm-up movement and external force homogenizing; Dissolving make its polyethylene overlength strand from nascent state pile up and strand between and multi-level complicated morphosis such as the inner entanglement of strand be transformed into to separate and twine macromolecular chain; Be in and do not have the condition of tangling; And utilize the relation of solubility and molecular weight dependence; Design one cover uses the Material Characteristics viscosity number to combine with dynamic viscosity, contrasts the method for testing of judging the UHMWPE molecular weight distribution by rotary viscometer test dynamic viscosity.Promptly at first measure the intrinsic viscosity of test sample; Choose the standard model and the test sample of identical characteristics viscosity number then and carry out the test of kinetic viscosity; Promptly utilize UHMWPE concentration for the 0.02g/100mL extremely dilute solution in; Make UHMWPE get rid of the variation of the kinetic viscosity that causes owing to UHMWPE " the born entanglement "; Be transformed into to separate and twine macromolecular chain; Being in does not have under the condition of tangling; Through the method that progressively heats up; Make the UHMWPE of different molecular weight carry out fractional solution; Be at first swelling and dissolving of the low part of molecular weight; Cause viscosity change, the part that molecular weight is high varies with temperature progressively dissolving then, utilizes the characteristic of polymer dissolution degree and molecular weight dependence; Use rotational viscosimeter; Keep certain shear rate, the test solution viscosity change, thus judge the characteristic of molecular weight distribution qualitatively with pairing comparision.
Use the Material Characteristics viscosity number to combine with kinetic viscosity; Evaluate the molecular weight distribution of UHMWPE raw material through method relatively; Promptly adopting a kind of " standard " raw material is standard model; The result who uses itself and test raw material to make an experiment under the same conditions evaluates; Can avoid to a certain extent in process of the test because the systematic error that parameter changes and measuring error causes, can be simpler and more direct and evaluate the performance of material easily.
The through characteristic viscosity number calculates the average viscosity average molecular weigh of UHMWPE; At present; The intrinsic viscosity test of UHMWPE lean solution adopts high temperature Ubbelohde viscometer device to carry out according to the viscosity test method (GB/T 1841-1980, ISO 1628-3:2001) of polyolefin lean solution.
The test of kinetic viscosity uses rotational viscosimeter to measure, and rotational viscosimeter adopts by motor-driven direct-reading viscosity meter, and synchronous motor drives the device that rotor rotates with stable speed rotation through hairspring and rotating shaft, carries out the measurement of high temperature kinetic viscosity.
Compared with prior art; Because the UHMWPE strand is very long; Viscosity is very big; Can't come determining molecular weight to distribute with existing GPC; The relation of the molecular weight dependence of the present invention by utilizing UHMWPE solubility; The method that design one cover uses the Material Characteristics viscosity number to combine with dynamic viscosity; Contrast the method for testing of judging the UHMWPE molecular weight distribution by rotary viscometer test dynamic viscosity and utilize contrast test; Can avoid to a certain extent in process of the test because the systematic error that parameter changes and measure error causes; Can be simpler and more direct and evaluate the performance of material easily; Thereby judge the characteristic of molecular weight distribution qualitatively; For estimating the ultra-high molecular weight polyethylene raw material means are provided, have specifically comprised following advantage:
(1) surface area is big, and stress sensitivity is high;
(2) good to unsettled system adaptability;
(3) can produce very high strain;
(4) be fit to the low viscosity system;
(5) testing equipment is simple, and is easy to use, and cost is low;
(6) good reproducibility.
Description of drawings
Fig. 1 is the sample viscosity comparative result of embodiment 1-4;
Fig. 2 is the sample viscosity comparative result of embodiment 5-8.
Embodiment
Below in conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Embodiment 1
Take by weighing a certain amount of GUR4022UHMWPE powder and antioxidant, add a certain amount of white oil solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).Concentration is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is as end product, and the result representes as standard specimen A then.
Embodiment 2
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of white oil solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation B sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 1 then and evaluated as end product.
Embodiment 3
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of white oil solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation C sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 1 then and evaluated as end product.
Embodiment 4
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of white oil solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation D sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 1 then and evaluated as end product.
As can be seen from Figure 1, on the molecular weight distribution width of UHMWPE, embodiment 2 (sample B)＞embodiment 3 (sample C)＞embodiment 4 (sample D)＞embodiment 1 (sample A-standard specimen).
Embodiment 5
Take by weighing a certain amount of GUR4022UHMWPE powder and antioxidant, add a certain amount of decahydronaphthalene solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparing A sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is as end product, and the result representes as standard specimen then.
Embodiment 6
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of decahydronaphthalene solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation B sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 5 then and evaluated as end product.
Embodiment 7
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of decahydronaphthalene solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation C sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 5 then and evaluated as end product.
Embodiment 8
Take by weighing a certain amount of UHMWPE powder and antioxidant, add a certain amount of decahydronaphthalene solvent, this mixed liquor is placed there-necked flask.Install and stir and heating arrangement, regulate and heat up and stir speed (S.S.).The concentration of preparation D sample is the extremely dilute solution of 0.02g/100mL, under 70 ℃, 80 ℃, 110 ℃, 120 ℃, 130 ℃, 135 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃ different temperature, utilizes the test of NDJ-1 type rotary viscosimeter standard under the 60rpm rotating speed, to measure viscosity at No. 1 rotor respectively.Each probe temperature all needs constant temperature 15min, and the viscosity reading is for write down 3 viscosity numbers at interval, and averaged is compared with embodiment 5 then and evaluated as end product.
As can be seen from Figure 2, on the molecular weight distribution width of UHMWPE, embodiment 6 (sample B)＞embodiment 7 (sample C)＞embodiment 8 (sample D)＞embodiment 5 (sample A-standard specimen)
Embodiment 9
A kind of qualitative test method of ultra-high molecular weight polyethylene molecular weight distribution, this method of testing may further comprise the steps:
(1) takes by weighing quantitative ultra-high molecular weight polyethylene to be measured (UHMWPE) powder and place there-necked flask; Add solvent then; Be adjusted to 0.02g/100ml; Install and stir and heating arrangement; Stirring and dissolving obtains mixed solution, and wherein, the viscosity average molecular weigh of ultra-high molecular weight polyethylene to be measured is 1,000,000; The solvent that uses is mineral oil, and in solvent, containing weight ratio is 0.1% phenolic antioxidant;
(2) take out the partially mixed solution of step (1), use Ubbelohde viscometer its intrinsic viscosity to be measured by the viscosity test method (ISO 1628-3:2001) of polyolefin lean solution;
(3) with remaining step (1) mixed solution; Utilize NDJ-1 type rotary viscosimeter under different probe temperatures; Adopt No. 1 rotor, the control rotating speed is 60rpm, measures the kinetic viscosity of mixed solution; The control probe temperature is 70-170 ℃; Each probe temperature, constant temperature 10min are tested in temperature difference classification intensification with 2 ℃ during test to mixed solution; The kinetic viscosity reading is for write down 3 kinetic viscosity values at interval, and averaged as a result of;
(4) the standard ultra-high molecular weight polyethylene of the identical characteristics viscosity number that records of optional step (2) is a raw material; The standard ultra-high molecular weight polyethylene is that the trade mark of Ticona company is the ultra-high molecular weight polyethylene of GUR4152; Adopt the flow process identical to detect the kinetic viscosity result who obtains the standard ultra-high molecular weight polyethylene with above-mentioned steps; The result that step (3) is obtained compares with the kinetic viscosity result of standard ultra-high molecular weight polyethylene, obtains the judged result qualitatively of the molecular weight distribution of ultra-high molecular weight polyethylene to be measured.
Embodiment 10
A kind of qualitative test method of ultra-high molecular weight polyethylene molecular weight distribution, this method of testing may further comprise the steps:
(1) takes by weighing quantitative ultra-high molecular weight polyethylene to be measured (UHMWPE) powder and place there-necked flask; Add solvent then; Be adjusted to 0.02g/100ml; Install and stir and heating arrangement; Stirring and dissolving obtains mixed solution, and wherein, the viscosity average molecular weigh of ultra-high molecular weight polyethylene to be measured is 10,000,000; The solvent that uses is saxol, and in solvent, containing weight ratio is 0.1% hindered phenol antioxygen;
(2) take out the partially mixed solution of step (1), use Ubbelohde viscometer its intrinsic viscosity to be measured by the viscosity test method (ISO 1628-3:2001) of polyolefin lean solution;
(3) with remaining step (1) mixed solution; Utilize NDJ-1 type rotary viscosimeter under different probe temperatures; Adopt No. 1 rotor, the control rotating speed is 60rpm, measures the kinetic viscosity of mixed solution; The control probe temperature is 70-170 ℃; Each probe temperature, constant temperature 10min are tested in temperature difference classification intensification with 10 ℃ during test to mixed solution; The kinetic viscosity reading is for write down 3 kinetic viscosity values at interval, and averaged as a result of;
(4) the standard ultra-high molecular weight polyethylene of the identical characteristics viscosity number that records of optional step (2) is a raw material; The standard ultra-high molecular weight polyethylene is that Beijing helps the two MII raw materials of producing; Adopt the flow process identical to detect the kinetic viscosity result who obtains the standard ultra-high molecular weight polyethylene with above-mentioned steps; The result that step (3) is obtained compares with the kinetic viscosity result of standard ultra-high molecular weight polyethylene, obtains the judged result qualitatively of the molecular weight distribution of ultra-high molecular weight polyethylene to be measured.
Claims (8)
1. the qualitative test method of a ultra-high molecular weight polyethylene molecular weight distribution is characterized in that, this method of testing may further comprise the steps:
(1) take by weighing quantitative ultra-high molecular weight polyethylene to be measured (UHMWPE) powder and place there-necked flask, add solvent then, be adjusted to 0.02g/100ml, install and stir and heating arrangement, stirring and dissolving obtains mixed solution;
(2) mixed solution that uses Ubbelohde viscometer that step (1) is obtained carries out the mensuration of intrinsic viscosity by the viscosity test method of polyolefin lean solution;
(3) utilize mixed solution that NDJ-1 type rotary viscosimeter obtains step (1) under different probe temperatures; Adopt No. 1 rotor; The control rotating speed is 60rpm; Measure the kinetic viscosity of mixed solution; Each probe temperature; The constant temperature certain hour, the kinetic viscosity reading is for write down 3 kinetic viscosity values at interval, and averaged is as a result of;
(4) the standard ultra-high molecular weight polyethylene of the identical characteristics viscosity number that records of optional step (2) is a raw material; Adopt the flow process identical to detect the kinetic viscosity result who obtains the standard ultra-high molecular weight polyethylene with above-mentioned steps; The result that step (3) is obtained compares with the kinetic viscosity result of standard ultra-high molecular weight polyethylene, obtains the judged result qualitatively of the molecular weight distribution of ultra-high molecular weight polyethylene to be measured.
2. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1 is characterized in that, the viscosity average molecular weigh of the ultra-high molecular weight polyethylene to be measured described in the step (1) is 100-1000 ten thousand.
3. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1; It is characterized in that; Solvent described in the step (1) is mineral oil, white oil, saxol, kerosene, naphthane or decahydronaphthalene, and wherein containing weight ratio in the solvent is 0.1% antioxidant.
4. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 3 is characterized in that, described antioxidant is one or more in phenolic antioxidant, the hindered phenol antioxygen.
5. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1; It is characterized in that the viscosity test method of the polyolefin lean solution described in the step (2) is to measure the method for polyolefin dilute solution viscosity according to ISO 1628-3:2001.
6. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1; It is characterized in that; Probe temperature described in the step (3) is 70-170 ℃, and the temperature difference classification intensification with 2-10 ℃ during test is tested mixed solution.
7. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1 is characterized in that, the constant temperature time described in the step (3) is 10-15min.
8. the qualitative test method of a kind of ultra-high molecular weight polyethylene molecular weight distribution according to claim 1; It is characterized in that the standard ultra-high molecular weight polyethylene described in the step (4) is that the trade mark of Ticona company is the ultra-high molecular weight polyethylene of GUR4020, GUR4022, GUR4032, GUR4152 or GUR4170 or MII, MIII or the MIV raw materials that Beijing helps two productions.
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| CN106979736A (en) * | 2017-04-13 | 2017-07-25 | 上汽大众汽车有限公司 | A kind of method of organic phosphite antioxidant content in detection polypropylene plastic |
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| CN113848154A (en) * | 2021-08-19 | 2021-12-28 | 深圳供电局有限公司 | Characterization method for consistency of crosslinking performance of crosslinked polyethylene 500kV cable insulation material |
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