CN102260367B - Thermoplastic polyurethane elastomer and preparation method thereof - Google Patents

Abstract

The invention relates to a thermoplastic polyurethane elastomer and a preparation method thereof. The preparation method comprises the following steps of: mixing polyester polyol, polyether polyol or a mixture of polyester polyol and polyether polyol, organic diisocyanate and micromolecular diol, inputting into a twin-screw premixing unit, shearing and dispersing in axial and radial directions at a high speed for 1 to 2 minutes to make the polymer have certain viscosity and molecular weight, pressing into a co-rotating reactive twin-screw extruder at the temperature of between 180 and 240DEG C, reacting for 2 to 3 minutes, and performing underwater granulation by using a granulator to obtain thermoplastic polyurethane elastomer particles. Compared with the prior art, the invention has a series of advantages that: production equipment investment is small, the process is simple, the process is controlled stably, and the prepared polyurethane elastomer has a few gel points, good appearance and color, good physical and mechanical properties, uniform molecular weight distribution and wide application prospect.

Description

A kind of Polyurethane Thermoplastic Elastomer and preparation method thereof

Technical field

The present invention relates to a kind of macromolecular compound and preparation method thereof, especially relate to a kind of Polyurethane Thermoplastic Elastomer and preparation method thereof.

Background technology

The main flow route of the production technique of existing Polyurethane Thermoplastic Elastomer is with quantitative low-molecular-weight diol to carry out chain extending reaction after forming polyurethane prepolymer earlier by macromolecule diol (comprising the pure and mild polyether glycol of polyester polyols) and organic diisocyanate mixing the initial stage, and wherein isocyanate index is controlled in the workability of adjusting polymkeric substance between the 0.95-1.05.

Domestic patent CN 1563133A has adopted bottler that glycol and isocyanic acid high-speed mixing is even, then by prepared in twin-screw extruder the soft TPU material of Shore A50～80;

Patent CN1434066A has announced that the triplex material is directly introduced twin screw extruder and two components introduces twin screw extruder with another component again through static mixer earlier, adopts the TPU of static mixer production will obviously be better than not using static mixer on the performance.

Patent CN1495210A has announced the triplex material has been incorporated in the twin screw extruder through accurate measurement, be incorporated into twin screw after confirm adopting static mixer that polyvalent alcohol and isocyanic ester are pre-mixed and extrude first section barrel, chainextender is introduced the follow-up barrel of twin screw extruder, the TPU that makes has better physicals and flame retardant properties with respect to introduce the TPU that twin screw extruder makes together without static mixer or three components again.

Sum up the continous way twin screw TPU production technique that domestic present stage adopts, two kinds of main branches: first kind, be to adopt static mixer or bottler, material is measured the back carry out the high efficient mixed dispersion at dispersing chamber, be expressed to then in the 160-240 ℃ of response type twin screw extruder, become high polymer molten through carrying, mediate a series of process reactions such as carrying kneading more again, become the TPU particle through the dicing machine underwater cutpellet again; Second kind, abandon mixing tank or bottler and three component raw materials are uniformly dispersed under high rotating speed by the response type twin screw extruder, extrude underwater cutpellet by dicing machine then.

These two kinds of methods respectively have relative merits: adopt static mixer or bottler, block easily through regular meeting's generation static mixer or bottler, because shearing force is not enough, material is blocked at a minute raw edge easily, causes the shutdown of production process; It is excessive that the volume pump flow deviation causes the MI variation of the TPU melt in the process simultaneously, causes molecular weight distribution inhomogeneous.Adopt the twin screw high speed rotating to come the technology of even dispersed material, require screw speed very fast, like this residence time of material in forcing machine very short, cause partial material not react completely, and too high rotating speed causes the high molecular decomposition of TPU easily, causes quality to descend.Therefore domestic existing processes all exists the problem that these have a strong impact on production process and product quality.

Summary of the invention

Purpose of the present invention is exactly to provide Polyurethane Thermoplastic Elastomer that a kind of gelation point is few, appearance luster good, physical and mechanical properties is good, recovered frequency is high and preparation method thereof for the defective that overcomes above-mentioned prior art existence.

Purpose of the present invention can be achieved through the following technical solutions:

A kind of Polyurethane Thermoplastic Elastomer is characterized in that, this elastomerics raw material comprises component A, organic diisocyanate and small molecules dibasic alcohol, and said components is according to following mixed:

$R=\frac{b}{a+c}$

Wherein R is isocyanate index, 0.97≤R≤1.03, and a is the amount of substance of component A, and b is the amount of substance of organic diisocyanate, and c is the amount of substance of small molecules dibasic alcohol.

Described component A is selected from one or both in polyester polyol or the polyether glycol.

Described polyester polyol is selected from poly-hexanodioic acid-1, in 4-butanediol ester glycol, polyethylene glycol adipate glycol, polypropylene adipate (PPA) glycol, poly-adipate glycol butanediol ester glycol or the poly-adipate glycol propylene glycol ester glycol one or more, molecular weight is 700-3000, preferred poly-hexanodioic acid-1,4-butanediol ester glycol, molecular weight is 1000-2000, and moisture content is controlled below 200ppm.

Described polyether glycol is selected among a kind of in PTMG, the polypropylene oxide glycol or two, and molecular weight is 650-3000, preferred PTMG, and molecular weight is 650-1000, moisture content is controlled below 200ppm.

Described organic diisocyanate is selected from 4,4-'-diphenylmethane diisocyanate, tolylene diisocyanate, Ben Yajiaji vulcabond, 1,5-is one or more in vulcabond, hexamethylene diisocyanate or the PPDI how, preferred 4, the 4-'-diphenylmethane diisocyanate, wherein the hexanaphthene insolubles is below 1000ppm, and colourity is below 30Apha.

Described small molecules dibasic alcohol is selected from ethylene glycol, 1,2 propylene glycol, 1,3 propylene glycol, 1,4 butyleneglycol, 1,3 butyleneglycols, 1, in 5 pentanediols, neopentyl glycol, 1,6 hexylene glycol, 1,8 ethohexadiol or the hydroquinone hydroxyethyl ether one or more, be preferably 1,4-butyleneglycol, moisture controlled are below 200ppm, and metal ion colour developing test is for colourless.

Be added with auxiliary agent among the described component A, described auxiliary agent comprises oxidation inhibitor, UV light absorber, photostabilizer, lubricant, hydrolysis stabilizer, and the mass ratio of this auxiliary agent and component A is (0.001-0.01): 1.

Described oxidation inhibitor is the mixture of Hinered phenols antioxidant and phosphorous acid kind antioxidant, described Hinered phenols antioxidant is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid or 2,6 di tert butyl 4 methyl phenol; Described phosphorous acid kind antioxidant is tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, two [2-methyl-4,6-two (1,1 '-dimethyl ethyl) phenol] phosphoric acid ethyl ester, four (2,4-di-tert-butyl-phenyl-4,4-xenyl) biphosphonate; Described UV light absorber be Octabenzone, 2-hydroxyl-4-methoxy benzophenone, 2-(2 '-hydroxyl-3 ', 5 '-the diamyl phenyl) benzotriazole, 2-(2 '-hydroxyl-5 '-aminomethyl phenyl) benzotriazole or 2-(2 '-hydroxyl-5 '-the Te octyl phenyl) benzotriazole; Described photostabilizer is that two (1,2,2,6,6-pentamethyl--4-piperidyl) sebates or sebacic acid are two-2,2,6,6-tetramethyl piperidine alcohol ester; Described lubricant is stearylamide, amine hydroxybenzene or N, N '-ethylenebisstearamide; Described hydrolysis stabilizer is carbodiimide, polycarbodiimide, phenyl glycidyl ether or four (phenyl glycidyl ether base) ethane.

A kind of method for preparing thermoplastic polyurethane elastomer is characterized in that, this method may further comprise the steps:

(1) prepare component A, organic diisocyanate and small molecules dibasic alcohol according to following component and content:

$R=\frac{b}{a+c}$

Wherein R is isocyanate index, 0.97≤R≤1.03, and a is the amount of substance of component A, and b is the amount of substance of organic diisocyanate, and c is the amount of substance of small molecules dibasic alcohol;

(2) component A, organic diisocyanate and the small molecules dibasic alcohol that will be added with auxiliary agent is input in the twin screw premix unit that rotating speed is 400-500rpm through volume pump and under meter accurate measurement, the control reaction times is 1-2min, temperature of reaction is 160 ℃, the material that obtains mixing;

(3) material that mixes is directed into react in the twin screw extruder of response type in the same way that rotating speed is 100-300rpm and extrudes; the control reaction times is 2-3min; polymerization temperature is 180-240 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

Compared with prior art, the present invention adopts one-step technology, whole process of production is relatively simple, the premix screw design axially and is radially all having very big shearing and adverse current, therefore the metering of material is more even on the whole time period, the twin screw premix unit that adopts suitably reduces the rotating speed of screw rod in operation process, reduce the conduct speed of material in screw rod, guarantee sufficient reacting, reduce screw rod shearing to the degraded of material, the Polyurethane Thermoplastic Elastomer of this explained hereafter has even molecular weight distribution, gelation point is few, appearance luster is good, physical and mechanical properties is good, therefore a series of advantages such as recovered frequency height are with a wide range of applications.

Embodiment

The present invention is described in detail below in conjunction with specific embodiment.

Embodiment 1-4 and Comparative Examples 1-2 adopt following raw material and auxiliary agent:

The PTMEG1000 PTMG, Mitsubishi, molecular weight 1000;

PBA 1000 poly-hexanodioic acids-1,4-butanediol ester glycol, Taiwan is pure forever, molecular weight 1000;

PBA 2000 poly-hexanodioic acids-1,4-butanediol ester glycol, Taiwan is pure forever, molecular weight 2000;

MDI 4,4-'-diphenylmethane diisocyanate, Japanese NOU, molecular weight 250.26;

BDO 1,4-butyleneglycol, Mitsubishi Chemical, molecular weight 90.12;

Dabco

The T-9 stannous octoate, the gas chemical industry;

Irganox1010 four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, Ciba;

Irgafos168 tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Ciba;

Tinuvin 329 2-(2 '-hydroxyl-5 '-the Te octyl phenyl) benzotriazole, Ciba;

292 pairs of (1,2,2,6,6-pentamethyl--4-piperidyl) sebates of Tinuvin, Ciba;

Licowax C N, N '-ethylenebisstearamide, gram Lay anthracene chemistry;

Staboxol P100 polycarbodiimide, Lay anthracene chemistry.

Embodiment 1

The A component adopts PTMEG1000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 20ppm in the A component T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C.

With above-mentioned three kinds of components respectively with 53.0wt%, 37.9wt%, it is 160 ℃ that the ratio process volume pump of 9.1wt% and under meter accurate measurement are incorporated into temperature, rotating speed is the twin screw premix unit of 400rpm, it is 200 ℃ through temperature again, rotating speed is that the response type twin screw extruder of 200rpm is extruded, finally by underwater cutpellet synthetic thermoplastic polyurethane elastomer particle.

Embodiment 2

The A component adopts PBA1000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 20ppm in the A component

T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C, the Staboxol P100 of 0.3wt%.

It is 160 ℃ that above-mentioned three kinds of components are incorporated into temperature with the ratio of 53.0wt%, 37.9wt%, 9.1wt% through volume pump, under meter accurate measurement respectively, rotating speed is 400rpm twin screw premix unit, it is 200 ℃ through temperature again, rotating speed is that the response type twin screw extruder of 200rpm is extruded, last underwater cutpellet synthetic thermoplastic polyurethane elastomer particle.

Embodiment 3

The A component adopts PBA1000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 20ppm in the A component T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C, the Staboxol P100 of 0.3wt%.

With above-mentioned three kinds of components respectively with 53.0wt%, 37.9wt%, it is 160 ℃ that the ratio of 9.1wt% is incorporated into temperature through volume pump, under meter accurate measurement, rotating speed is 600rpm twin screw premix unit, it is 200 ℃ through temperature again, rotating speed is that the response type twin screw extruder of 200rpm is extruded, last underwater cutpellet synthetic thermoplastic polyurethane elastomer particle.

Embodiment 4

The A component adopts PBA2000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 50ppm in the A component

T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C, the Staboxol P100 of 0.3wt%.

With above-mentioned three kinds of components respectively with 53.0wt%, 36.2wt%, it is 160 ℃ that the ratio of 10.8wt% is incorporated into temperature through volume pump, under meter accurate measurement, rotating speed is 400rpm twin screw premix unit, be 200 ℃ through temperature again, rotating speed is underwater cutpellet synthetic thermoplastic polyurethane elastomer particle behind the response type twin screw extruder of 200rpm.

Comparative Examples 1

The A component adopts PBA1000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 20ppm in the A component

T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C, the Staboxol P100 of 0.3wt%.

With above-mentioned three kinds of components respectively with 53.0wt%, 37.9wt%, the ratio of 9.1wt% is through volume pump, under meter accurate measurement, and be that the high-speed mixing head of 4000rpm is filled into 200 ℃ of temperature by rotating speed, rotating speed is first barrel of the response type twin screw extruder of 200rpm, through underwater cutpellet synthetic thermoplastic polyurethane elastomer particle.

Comparative Examples 2

The A component adopts PBA1000, and organic diisocyanate is MDI, and the small molecules dibasic alcohol is BDO, and it is heated to 90 ℃, 60 ℃, 45 ℃ respectively, adds the DABCO of 20ppm in the A component

T-9, the Irganox1010 of 0.2wt%, 0.2wt%Irgafos168,0.4wt%Tinuvin 329,0.4wt%Tinuvin292,0.4wt%Licowax C, the Staboxol P100 of 0.3wt%.

With above-mentioned three kinds of components respectively with 53.0wt%, 37.9wt%, the ratio of 9.1wt% directly is filled into 200 ℃ through volume pump, under meter accurate measurement, and first barrel of the response type twin screw extruder of 400rpm is through underwater cutpellet synthetic thermoplastic polyurethane elastomer particle.

Performance comparison between table 1 different instances

Example	Embodiment 1	Embodiment 2	Embodiment 3	Embodiment 4	Comparative Examples 1	Comparative Examples 2
							Shut down number of times (Time/week)	0	0	0	0	3 *	2 **
MI(g/10min) (208℃5kgf×7min)	19.5	15.7	13.5	15.2	16.7	19.2
							Hardness (A)	95	95	95	95	95	95
Colourity (Apha)	30	30	30	30	32	31
							Tensile strength (Mpa)	35.2	43.1	47.2	42.8	40.2	38.3
Elongation at break (%)	530	430	420	430	400	380
							Gelation point (Number/m)	5-8	5-8	3-5	5-8	10-15	15-20
Reclaim (Time) for several times	4	5	6	5	3	2

^*Perfusing hole blocks shuts down 2 times, and the charging opening flash is shut down 1 time;

^*Because twining to, the pelletizing of screw torque instability shuts down 2 times.

Bottler high speed dispersion perfusion and the response type twin screw traditional relatively from result's reflection of table 1 directly disperse, the twin screw premix unit of this process using disperses and the Polyurethane Thermoplastic Elastomer of response type twin screw polymerization preparation has better physical and mechanical properties, gelation point still less, better colourity, more recovered frequency, and characteristics such as equipment investment cost is low, technology is simple, process operation is stable, therefore be with a wide range of applications.

Embodiment 5

A kind of method for preparing thermoplastic polyurethane elastomer, this method may further comprise the steps:

(1) with molecular weight is 650 PTMG, the hexanaphthene insolubles is below 1000ppm, colourity below 30Apha 4,4-'-diphenylmethane diisocyanate and moisture controlled are below 200ppm, metal ion colour developing test is colourless 1, the 4-butyleneglycol mixes, its component concentration is as follows: b/ (a+c)=0.97, wherein a is the amount of substance of PTMG, b is 4, the amount of substance of 4-'-diphenylmethane diisocyanate, c is the amount of substance of 1,4-butyleneglycol, in addition, be added with the auxiliary agent of 0.1wt% in the PTMG, this auxiliary agent comprises four [β-(3,5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, two [2-methyl-4,6-two (1,1 '-dimethyl ethyl) phenol] the phosphoric acid ethyl ester, 2-(2 '-hydroxyl-5 '-aminomethyl phenyl) benzotriazole, sebacic acid two-2,2,6,6-tetramethyl piperidine alcohol ester, stearylamide;

(2) will be added with the PTMG, 4 of auxiliary agent, 4-'-diphenylmethane diisocyanate and 1, the 4-butyleneglycol is input in the twin screw premix unit that rotating speed is 400rpm through volume pump and under meter accurate measurement, the control reaction times is 2min, temperature of reaction is 140 ℃, the material that obtains mixing;

(3) material that mixes is directed in the twin screw extruder of response type in the same way that rotating speed is 100rpm and extrudes, the control reaction times is 3min, and polymerization temperature is 180 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

Embodiment 6

A kind of method for preparing thermoplastic polyurethane elastomer, this method may further comprise the steps:

(1) be 700 with molecular weight, the poly-hexanodioic acid-1 of moisture content control below 200ppm, 4-butanediol ester glycol, molecular weight is that 3000 polyethylene glycol adipate glycol is as component A, with component A, 1,5-how vulcabond and neopentyl glycol mixes, its component concentration is as follows: b/ (a+c)=1.03, wherein a is the amount of substance of component A, b is 1,5-is the amount of substance of vulcabond how, c is the amount of substance of neopentyl glycol, in addition, is added with the auxiliary agent of 1wt% in the polyethylene glycol adipate glycol, this auxiliary agent comprises β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid, two [2-methyl-4,6-two (1,1 '-dimethyl ethyl) phenol] phosphoric acid ethyl ester, 2-(2 '-hydroxyl-5 '-aminomethyl phenyl) benzotriazole, two (1,2,2,6,6-pentamethyl--4-piperidyl) sebate, stearylamide, polycarbodiimide;

(2) will be added with the component A, 1 of auxiliary agent, 5-how vulcabond and neopentyl glycol is input in the twin screw premix unit that rotating speed is 500rpm through volume pump and under meter accurate measurement, the control reaction times is 1min, and temperature of reaction is 140 ℃, the material that obtains mixing;

(3) material that mixes is directed in the twin screw extruder of response type in the same way that rotating speed is 300rpm and extrudes, the control reaction times is 2min, and polymerization temperature is 240 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

Embodiment 7

A kind of method for preparing thermoplastic polyurethane elastomer, this method may further comprise the steps:

(1) be 3000 with molecular weight, the poly-adipate glycol butanediol ester glycol (ethylene glycol and butyleneglycol mol ratio be 1: 1) of moisture content control below 200ppm is as component A, with component A, hexamethylene diisocyanate and 1,8 ethohexadiols mix, its component concentration is as follows: b/ (a+c)=1.00, wherein a is the amount of substance of component A, b is the amount of substance of hexamethylene diisocyanate, c is 1, the amount of substance of 8 ethohexadiols, in addition, be added with the auxiliary agent of 0.5wt% in the poly-adipate glycol butanediol ester glycol, this auxiliary agent comprises β-positive octadecanol ester of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, Octabenzone, two (1,2,2,6,6-pentamethyl--4-piperidyl) sebate, stearylamide, four (phenyl glycidyl ether base) ethane;

(2) component A, organic diisocyanate and the small molecules dibasic alcohol that will be added with auxiliary agent is input in the twin screw premix unit that rotating speed is 500rpm through volume pump and under meter accurate measurement, the control reaction times is 1min, temperature of reaction is 140 ℃, the material that obtains mixing;

(3) material that mixes is directed in the twin screw extruder of response type in the same way that rotating speed is 200rpm and extrudes, the control reaction times is 3min, and polymerization temperature is 200 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

Embodiment 8

A kind of method for preparing thermoplastic polyurethane elastomer, this method may further comprise the steps:

(1) be 2000 with molecular weight, the poly-hexanodioic acid-1 of moisture content control below 200ppm, 4-butanediol ester glycol and molecular weight are 650, the polytetrahydrofuran of moisture content control below 200ppm is as component A, with component A, hexamethylene diisocyanate and 1,8 ethohexadiols mix, its component concentration is as follows: b/ (a+c)=1, wherein a is the amount of substance of component A, b is the amount of substance of hexamethylene diisocyanate, and c is the amount of substance of 1,8 ethohexadiol, in addition, be added with the auxiliary agent of 0.5wt% in the polyethylene glycol adipate glycol, this auxiliary agent comprises β-positive octadecanol ester of (3,5-di-tert-butyl-hydroxy phenyl) propionic acid, tricresyl phosphite (2, the 4-di-tert-butyl-phenyl) ester, Octabenzone, two (1,2,2,6,6-pentamethyl--4-piperidyl) sebate, stearylamide, carbodiimide;

(2) component A, organic diisocyanate and the small molecules dibasic alcohol that will be added with auxiliary agent is input in the twin screw premix unit that rotating speed is 600rpm through volume pump and under meter accurate measurement, the control reaction times is 1min, temperature of reaction is 140 ℃, the material that obtains mixing;

(3) material that mixes is directed in the twin screw extruder of response type in the same way that rotating speed is 200rpm and extrudes, the control reaction times is 3min, and polymerization temperature is 200 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

Claims (12)

1. a Polyurethane Thermoplastic Elastomer is characterized in that, this elastomerics raw material comprises component A, organic diisocyanate and small molecules dibasic alcohol, and said components is according to following mixed:

Wherein R is isocyanate index, 0.97≤R≤1.03, and a is the amount of substance of component A, and b is the amount of substance of organic diisocyanate, and c is the amount of substance of small molecules dibasic alcohol;

Described component A is selected from one or both in polyester polyol or the polyether glycol;

Method for preparing thermoplastic polyurethane elastomer may further comprise the steps:

(1) prepare component A, organic diisocyanate and small molecules dibasic alcohol according to following component and content:

Wherein R is isocyanate index, 0.97≤R≤1.03, and a is the amount of substance of component A, and b is the amount of substance of organic diisocyanate, and c is the amount of substance of small molecules dibasic alcohol;

(2) component A, organic diisocyanate and the small molecules dibasic alcohol that will be added with auxiliary agent is input in the twin screw premix unit that rotating speed is 400-500rpm through volume pump and under meter accurate measurement, the control reaction times is 1-2min, temperature of reaction is 160 ℃, the material that obtains mixing;

(3) material that mixes is directed into react in the twin screw extruder of response type in the same way that rotating speed is 100-300rpm and extrudes; the control reaction times is 2-3min; polymerization temperature is 180-240 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.

2. a kind of Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, described polyester polyol is selected from poly-hexanodioic acid-1, in 4-butanediol ester glycol, polyethylene glycol adipate glycol, polypropylene adipate (PPA) glycol, poly-adipate glycol butanediol ester glycol or the poly-adipate glycol propylene glycol ester glycol one or more, molecular weight is 700-3000, and moisture content is controlled below 200ppm.

3. a kind of Polyurethane Thermoplastic Elastomer according to claim 2 is characterized in that, described polyester polyol is poly-hexanodioic acid-1,4-butanediol ester glycol.

4. a kind of Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, described polyether glycol is selected from one or both in PTMG, the polypropylene oxide glycol, and molecular weight is 650-3000, and moisture content is controlled below 200ppm.

5. a kind of Polyurethane Thermoplastic Elastomer according to claim 4 is characterized in that, described polyether glycol is PTMG.

6. a kind of Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, described organic diisocyanate is selected from 4,4 '-'-diphenylmethane diisocyanate, tolylene diisocyanate, Ben Yajiaji vulcabond, 1, in 5-naphthalene diisocyanate, hexamethylene diisocyanate or the PPDI one or more, wherein the hexanaphthene insolubles is below 1000ppm, and colourity is below 30Apha.

7. a kind of Polyurethane Thermoplastic Elastomer according to claim 6 is characterized in that, described organic diisocyanate is 4,4 '-'-diphenylmethane diisocyanate.

8. a kind of Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that described small molecules dibasic alcohol is selected from ethylene glycol, 1,2 propylene glycol, 1,3 propylene glycol, 1,4 butyleneglycols, 1,3 butyleneglycol, 1,5 pentanediol, neopentyl glycol, 1,6 hexylene glycols, 1, in 8 ethohexadiols or the hydroquinone hydroxyethyl ether one or more, moisture controlled are below 200ppm, and metal ion colour developing test is for colourless.

9. a kind of Polyurethane Thermoplastic Elastomer according to claim 8 is characterized in that, described small molecules dibasic alcohol is 1,4-butyleneglycol.

10. a kind of Polyurethane Thermoplastic Elastomer according to claim 1, it is characterized in that, be added with auxiliary agent among the described component A, described auxiliary agent is oxidation inhibitor, UV light absorber, photostabilizer, lubricant, hydrolysis stabilizer, and the mass ratio of this auxiliary agent and component A is (0.001-0.01) ︰ 1.

11. a kind of Polyurethane Thermoplastic Elastomer according to claim 10, it is characterized in that, described oxidation inhibitor is the mixture of Hinered phenols antioxidant and phosphorous acid kind antioxidant, described Hinered phenols antioxidant is four [β-(3, the 5-di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythritol ester, β-(3, the 5-di-tert-butyl-hydroxy phenyl) the positive octadecanol ester of propionic acid or 2,6 di tert butyl 4 methyl phenol; Described phosphorous acid kind antioxidant is tricresyl phosphite (2,4-di-tert-butyl-phenyl) ester, two [2-methyl-4,6-two (1,1 '-dimethyl ethyl) phenol] phosphoric acid ethyl ester, four (2,4-di-tert-butyl-phenyl-4,4-xenyl) biphosphonate; Described UV light absorber is Octabenzone, 2-hydroxyl-4-methoxy benzophenone, 2-(2'-hydroxyl-3', 5'-diamyl phenyl) benzotriazole, 2-(2'-hydroxyl-5'-aminomethyl phenyl) benzotriazole or 2-(the special octyl phenyl of 2'-hydroxyl-5'-) benzotriazole, described photostabilizer is two (1,2,2,6,6-pentamethyl--4-piperidyl) sebate or sebacic acid two-2,2,6,6-tetramethyl piperidine alcohol ester; Described lubricant is stearylamide, amine hydroxybenzene or N, N '-ethylenebisstearamide; Described hydrolysis stabilizer is carbodiimide, polycarbodiimide, phenyl glycidyl ether or four (phenyl glycidyl ether base) ethane.

12. a method for preparing thermoplastic polyurethane elastomer is characterized in that, this method may further comprise the steps:

(1) prepare component A, organic diisocyanate and small molecules dibasic alcohol according to following component and content:

Wherein R is isocyanate index, 0.97≤R≤1.03, a is the amount of substance of component A, and b is the amount of substance of organic diisocyanate, c is the amount of substance of small molecules dibasic alcohol, and described component A is selected from one or both in polyester polyol or the polyether glycol;

(2) component A, organic diisocyanate and the small molecules dibasic alcohol that will be added with auxiliary agent is input in the twin screw premix unit that rotating speed is 400-500rpm through volume pump and under meter accurate measurement, the control reaction times is 1-2min, temperature of reaction is 160 ℃, the material that obtains mixing;

(3) material that mixes is directed into react in the twin screw extruder of response type in the same way that rotating speed is 100-300rpm and extrudes; the control reaction times is 2-3min; polymerization temperature is 180-240 ℃, namely makes the Polyurethane Thermoplastic Elastomer particle through the dicing machine underwater cutpellet again.