A polyurethane plastic track

Abstract

This invention discloses a polyurethane plastic running track and its preparation method. The raw materials for the polyurethane plastic running track include component A, component B, and a catalyst. Component A includes a polyurethane prepolymer, and component B includes polyether polyol, amino polyether polyol chain extender, powder, plasticizer, and optional other additives. The amino polyether polyol has good tensile strength and elongation at break in the field of plastic running tracks, and can replace toxic and carcinogenic chain extenders, reduce the toxicity of downstream systems, and has green and environmentally friendly advantages.

Description

Technical Field

[0001] This invention relates to the field of polyurethane technology, and specifically to a polyurethane plastic running track. Background Technology

[0002] In the field of plastic running tracks, the reactivity of the system is crucial to the preparation of the track. Reactivity controls the reaction process, thereby affecting the molecular weight distribution and crosslinking density of the product, and ultimately impacting the physical properties of the product, such as tensile strength and elongation at break. For ease of operation, it is usually required that the different components have low reactivity after mixing, but this reduces the final degree of reaction. To avoid the material properties failing to meet requirements, chain extenders are added in practice to solve this problem. Commonly used chain extenders include MOCA (4,4'-methylenedi(2-chloroaniline)) and diethyltoluenediamine, but these chain extenders have suspected carcinogenicity. With increasing emphasis on health and safety, the development of new green and environmentally friendly chain extenders is an inevitable trend.

[0003] Polyether polyols are substances that are not significantly toxic to humans and the environment. However, due to their low activity, conventional polyether polyols cannot meet the requirements of high activity and high curing, making it difficult to realize the function of chain extenders.

[0004] It is of great significance to provide a polyurethane plastic running track with good chain extension effect and no toxicity. Summary of the Invention

[0005] The purpose of this invention is to provide a polyurethane running track with a simple preparation process, good chain extension effect, and a more environmentally friendly polyurethane running track with mechanical properties that meet the requirements for use.

[0006] To address the aforementioned problems, this invention provides a polyurethane plastic running track, characterized in that it uses amino polyether as a chain extender.

[0007] Preferably, the raw materials of the polyurethane plastic running track include component A, component B and catalyst, wherein component A includes polyurethane prepolymer or isocyanate component, and component B includes polyether polyol and chain extender, preferably, the chain extender is amino polyether polyol.

[0008] Preferably, the mass ratio of component A, component B, and catalyst is 1:2-5:0.1-1%.

[0009] Preferably, the polyurethane prepolymer is prepared by reacting isocyanate and polyether polyol. Preferably, the preparation method of the polyurethane prepolymer includes: mixing isocyanate and polyether polyol, reacting at 80-95°C until NCO approaches the theoretical value, stopping the reaction, optionally adding a plasticizer, stirring and mixing evenly to obtain the polyurethane prepolymer;

[0010] Preferably, the isocyanate is one or more of 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, and polymethylene polyphenyl isocyanate.

[0011] Preferably, in the polyurethane prepolymer, the polyether polyol is selected from one or more of the following: polyether polyols with a molecular weight of 1000-5000 g / mol, a functionality of 2, and a hydroxyl value of 20-120 mgKOH / g; polyether polyols with a molecular weight of 3000-6000 g / mol, a functionality of 3, and a hydroxyl value of 25-60 mgKOH / g; and preferably one or more of the following: polyethylene oxide polyols and polypropylene oxide polyols, such as one or more of WANOL C2010D, WANOL C2020, WANOL C2040D, WANOL C2130, WANOL C2140F, WANOL F3056D, WANOL F3135, and WANOL F3128.

[0012] Preferably, component B further includes powder, optional plasticizer, and optional other additives.

[0013] Preferably, the other additives include one or more of pigments, dispersants, antioxidants, ultraviolet absorbers, etc.

[0014] Preferably, component B comprises the following components in parts by weight: 5-20 parts of polyether polyol, 30-70 parts of powder, 0-30 parts of plasticizer, 0.5-7 parts of chain extender, 0-5 parts of pigment, 0-1 part of dispersant, 0-5 parts of antioxidant, and 0-5 parts of ultraviolet absorber.

[0015] Preferably, component B comprises the following components in parts by weight: 5-20 parts of polyether polyol, 30-70 parts of powder, 5-30 parts of plasticizer, 0.5-7 parts of chain extender, 0-5 parts of pigment, 0-1 part of dispersant, 0-5 parts of antioxidant, and 0-5 parts of ultraviolet absorber.

[0016] The preparation method of component B is as follows: mix polyether polyol and optional pigment, stir for 0.5-1h until uniform, heat to 100-120℃, add powder, optional plasticizer, chain extender, optional dispersant, optional antioxidant and optional UV absorber, grind and stir for 0.5-1h, vacuum dehydrate for 1-2h, cool to 40-50℃, discharge and seal for storage.

[0017] Preferably, the polyether polyol in component B is selected from one or more polyether polyols with a molecular weight of 1000-5000 g / mol, a functionality of 2, and a hydroxyl value of 20-120 mgKOH / g, and polyether polyols with a molecular weight of 400-6000 g / mol, a functionality of 3, and a hydroxyl value of 25-450 mgKOH / g.

[0018] The polyether polyol described in component B of this application is not an amino polyether polyol.

[0019] Preferably, the amino polyether polyol chain extender has a functionality of 2-4 and an average weight-average molecular weight of 150-1000.

[0020] Preferably, the amino polyether polyol chain extender is an amino polyether polyol prepared by ring-opening polymerization of epoxide alkane with amine as the initiator.

[0021] The preparation method of the amino polyether polyol of the present invention includes: adding an initiator into a reactor and mixing it uniformly; adding an alkaline catalyst and an epoxide alkane under an inert atmosphere; carrying out an epoxide ring-opening reaction at a reaction temperature; ripening and degassing after feeding; and optionally undergoing purification post-treatment or directly obtaining the polyether polyol.

[0022] The initiator includes an aromatic amine;

[0023] Preferably, the aromatic amine is selected from one or more of aniline, toluene, ethylaniline, propylaniline, butylaniline, dimethylaniline, 2-methoxyaniline, mesitylene, phenethylamine, diphenylmethylamine, phenylenediamine, N-methylphenylenediamine, diaminotoluene, dimethylphenylenediamine, N,N-dimethylphenylenediamine, N,N-diethylphenylenediamine, diethyltoluenediamine, tetramethylphenylenediamine, and p-diaminobiphenyl, with aniline, phenylenediamine, diaminotoluene, N,N-dimethylphenylenediamine, and p-diaminobiphenyl being the most preferred.

[0024] Preferably, the initiator may further include aliphatic amines, including but not limited to one or more of ethanolamine, diethanolamine, triethanolamine, ethylenediamine, cyclohexylamine, hexamethylenediamine, and cyclohexanediamine.

[0025] Preferably, the aromatic amine in the initiator accounts for more than 20% by mass, and more preferably, the aromatic amine accounts for more than 50% by mass.

[0026] Preferably, the alkaline catalyst is one or more of potassium hydroxide, sodium hydroxide, cesium hydroxide, dimethylamine, trimethylamine, dipropylamine, tripropylamine, N,N-dimethylcyclohexylamine, N-methyl-N-ethylcyclohexylamine, N-methyl-N-propylcyclohexylamine, N,N-diethylcyclohexylamine, N,N-dimethyloctadecylamine, pentamethyldiethylenetriamine, N-methyldiethanolamine, 2-dimethylethanolamine, 1,4-dimethylpiperazine, N,N-dimethylbenzylamine, N,N-dimethylmethylamine, dodecyldimethyltertiaryamine, imidazole, N-methylimidazolium, 2-methylimidazolium, 2-ethylimidazolium, 4-methylimidazolium, and 2-ethyl-4-methylimidazolium.

[0027] Preferably, the epoxide includes one or more of ethylene oxide, propylene oxide, and butane oxide.

[0028] Preferably, the preparation method of the amino polyether polyol can be carried out in a variety of known ways, and optionally, the following two methods can be used:

[0029] Method 1: Replace the gas in the reactor with an inert gas such as nitrogen. Replace with nitrogen 3-5 times. Evacuate to negative pressure as needed. First, add some epoxy alkane. The initiator reacts with the epoxy alkane at the reaction temperature. After the reaction is completed, ripen and degas. Then add the catalyst and continue to add epoxy alkane to react.

[0030] Method 2: Replace the gas in the reactor with an inert gas such as nitrogen. Replace with nitrogen 3-5 times. Evacuate to negative pressure as needed. First add the catalyst, and then add epoxide alkane at the reaction temperature to carry out the reaction.

[0031] The preparation method of amino polyether polyol can be any known polyether preparation process, such as controlling the reaction temperature at 90-160℃, preferably 110-140℃.

[0032] The polyether polyol is optionally obtained through a purification process or directly. The optional methods include the following, and one of them may be selected:

[0033] 1. Add acid and water to the crude polyether polyol for neutralization. After the reaction, add adsorbent, dehydrate, and filter. The neutralization process is carried out at 70-90℃ for 30-90 minutes, and the dehydration process is carried out at 80-120℃ for 1-4 hours. The acid is one or more of phosphoric acid, sulfuric acid, acetic acid, and lactic acid, and the adsorbent is one or more of magnesium silicate, aluminum silicate, and magnesium aluminum silicate.

[0034] 2. Add acid to carry out a neutralization reaction. The final product is obtained after the reaction is completed. The neutralization process temperature is 70-120℃, and the neutralization time is 30-90 minutes. The acid is one or more of phosphoric acid, sulfuric acid, acetic acid, and lactic acid.

[0035] 3. Add water and adsorbent to the crude polyether polyol for adsorption treatment. After adsorption, dehydrate and filter. The adsorption process temperature is 80-110℃, and the stirring time is 30-90 min. The dehydration process temperature is 80-120℃, and the dehydration time is 1-4 h. The adsorbent is one or more of magnesium silicate, aluminum silicate, and magnesium aluminum silicate.

[0036] 4. No processing is required; the final product is obtained directly.

[0037] The powder comprises one or more of heavy calcium carbonate, talc, and light calcium carbonate. Preferably, the particle size of the powder is 400-1250 mesh.

[0038] The plasticizer is one or more of chlorinated paraffin, methyl chlorinated palm oil, dioctyl terephthalate, and tributyl acetyl citrate.

[0039] The pigments include iron oxide red, iron oxide green, phthalocyanine blue, etc.

[0040] The antioxidants include antioxidant 1076, antioxidant 1010, antioxidant 1135, etc.

[0041] The ultraviolet absorbers include ultraviolet absorber UV-531, ultraviolet absorber UV-P, ultraviolet absorber UV-1, ultraviolet absorber UV-9, etc.

[0042] The dispersant includes polyether-modified polysiloxane, carboxylic acid ester block polymers, and polyacid ester block copolymers.

[0043] The present invention has the following beneficial effects:

[0044] (1) Using the amino polyether polyol obtained in this invention as a polyurethane chain extender can realize the substitution of amines such as MOCA in the plastic track industry, reduce the harmful substances in the track, and conform to the green and environmentally friendly development trend.

[0045] (2) The amino polyether polyol of the present invention has a suitable working period, and its tensile strength and elongation at break properties are close to those of MOCA. It can meet the requirements of the plastic running track standard GB36246-2018, and can improve the hardness of the running track and enhance the user's experience. Detailed Implementation

[0046] The present invention will be further described below with reference to embodiments, but these embodiments do not limit the implementation of the present invention.

[0047] Test methods for testing the properties of polyether polyols:

[0048] Determination of hydroxyl value of polyether polyols: GB / T 12008.3-2009;

[0049] Determination of viscosity of polyether polyols: GB / T10008.7-2010;

[0050] Determination of pH of polyether polyols: GB / T9724-2007.

[0051] Examples 1-3 are examples of the preparation of amino polyether polyols.

[0052] Example 1

[0053] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 500g of aniline and 140g of diethanolamine were added. The mixture was purged with nitrogen five times, and the pressure was evacuated to -0.09MPa. The autoclave was stirred and heated to 120℃. 630g of propylene oxide was added dropwise to the autoclave at a rate of 200g per hour using a constant flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, the pressure was evacuated to -0.09MPa. 4g of potassium hydroxide was added to the autoclave, and the temperature inside the autoclave was 120℃. 290g of propylene oxide was added dropwise to the autoclave at a rate of 200g per hour using a constant flow plunger pump. At the same time, 450g of ethylene oxide was added dropwise to the autoclave at a rate of 310g per hour using another constant flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, the autoclave was evacuated to obtain the crude polyether product. Add 7g of phosphoric acid and 60g of water to the crude polyether at 80℃. After reacting for 30 minutes, add 4g of magnesium aluminum silicate adsorbent, stir for 20 minutes, and then dehydrate for 1 hour. Subsequently, raise the temperature to 120℃ and dehydrate for 1 hour. Filter to obtain amino polyether polyol.

[0054] Upon testing, the amino polyether polyol exhibits the following properties:

[0055] Hydroxyl value: 413 mg KOH / g

[0056] Viscosity: 1050 mPa·s at 25℃

[0057] pH: 8.9

[0058] Functionality: 2.2

[0059] Average molecular weight: 300.

[0060] Example 2

[0061] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 300g of o-phenylenediamine, 147g of cyclohexylamine, and 7.6g of potassium hydroxide were added. The autoclave was purged with nitrogen five times, and a vacuum was applied to a pressure of -0.09MPa. The autoclave was stirred and heated to 130℃. 1060g of propylene oxide was added dropwise to the autoclave at a rate of 350g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, 1050g of ethylene oxide was added dropwise to the autoclave at a rate of 450g per hour. After maturing until the pressure inside the autoclave remained constant for 20 minutes, a vacuum was applied to obtain the crude polyether product. 13.3g of phosphoric acid and 100g of water were added to the crude polyether at 80℃. After reacting for 30 minutes, 5g of magnesium aluminum silicate adsorbent was added. The reaction was stirred for 20 minutes, followed by dehydration for 1 hour. The temperature was then raised to 120℃ for another 1 hour of dehydration. Filtration yielded the amino polyether polyol.

[0062] Upon testing, the amino polyether polyol exhibits the following properties:

[0063] Hydroxyl value: 310 mg KOH / g

[0064] Viscosity: 825 mPa·s at 25℃

[0065] pH: 9.1

[0066] Functionality: 3.3

[0067] Average molecular weight: 600.

[0068] Example 3

[0069] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 320g of o-toluenediamine, 100g of triethanolamine, and 2.6g of N-methylimidazole were added. The autoclave was purged with nitrogen five times, stirred, and heated to 120℃. 500g of ethylene oxide was added dropwise to the autoclave at a rate of 300g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, 1.8g of potassium hydroxide was added. The temperature inside the autoclave was then 130℃, and 1708g of ethylene oxide was added dropwise to the autoclave at a rate of 450g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, vacuum was applied to obtain a crude polyether product. 1.93g of acetic acid was added to the crude polyether at 90℃, and the mixture was stirred for 40 minutes to obtain an amino polyether polyol.

[0070] Upon testing, the amino polyether polyol exhibits the following properties:

[0071] Hydroxyl value: 268 mg KOH / g

[0072] Viscosity: 532 mPa·s at 25℃

[0073] pH: 10.2

[0074] Sensory appeal: 3.8

[0075] Average molecular weight: 800.

[0076] Example 4

[0077] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 350g of p-diaminobiphenyl and 100g of aniline were added. The mixture was purged with nitrogen five times, stirred, and heated to 130℃. 428g of ethylene oxide was added dropwise to the autoclave at a rate of 200g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, 6g of potassium hydroxide was added. At the same temperature, 1205g of propylene oxide was added dropwise to the autoclave at a rate of 400g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, vacuum was applied to obtain a crude polyether product. 10.5g of phosphoric acid and 100g of water were added to the crude polyether at 80℃. After reacting for 30 minutes, 4g of magnesium aluminum silicate adsorbent was added. The mixture was stirred for 20 minutes and then dehydrated for 1 hour. The temperature was then raised to 120℃ for another 1 hour of dehydration. Filtration yielded the amino polyether polyol.

[0078] Upon testing, the amino polyether polyol exhibits the following properties:

[0079] Hydroxyl value: 263 mg KOH / g

[0080] Viscosity: 647 mPa·s at 25℃

[0081] pH: 9.0

[0082] Functionality: 3.3

[0083] Average molecular weight: 700.

[0084] Example 5

[0085] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 400g of N,N-dimethylphenylenediamine, 50g of hexamethylenediamine, and 2.2g of potassium hydroxide were added. The autoclave was purged with nitrogen five times, stirred, and heated to 140℃. 1713g of ethylene oxide was added dropwise to the autoclave at a rate of 350g per hour using a constant-flow plunger pump. After maturing until the pressure inside the autoclave remained constant for 20 minutes, a vacuum was applied to obtain a crude polyether product. 3.5g of lactic acid was added to the crude polyether at 90℃, and the mixture was stirred for 40 minutes to obtain an amino polyether polyol.

[0086] Upon testing, the amino polyether polyol exhibits the following properties:

[0087] Hydroxyl value: 254 mg KOH / g

[0088] Viscosity: 355 mPa·s at 25℃

[0089] pH: 9.5

[0090] Functionality: 2.3

[0091] Average molecular weight: 500.

[0092] Example 6

[0093] In a 5L stainless steel autoclave equipped with a stirrer, heating and temperature control device, cooling device, and pressure sensor, 500g of phenylenediamine, 320g of diethanolamine, and 3.8g of potassium hydroxide were added. The mixture was purged with nitrogen five times, stirred, and heated to 140℃. 1150g of propylene oxide was added dropwise to the autoclave at a rate of 350g per hour using a constant-flow plunger pump. After maturation until the pressure inside the autoclave remained constant for 20 minutes, a vacuum was applied to obtain the crude polyether product. 6.6g of phosphoric acid and 95g of water were added to the crude polyether at 80℃, and the reaction was allowed to proceed for 30 minutes. Then, 4g of magnesium aluminum silicate adsorbent was added, and the mixture was stirred for 20 minutes before dehydration for 1 hour. The temperature was then raised to 120℃ for further dehydration for 1 hour. Filtration yielded the amino polyether polyol.

[0094] Upon testing, the amino polyether polyol exhibits the following properties:

[0095] Hydroxyl value: 505 mg KOH / g

[0096] Viscosity: 1206 mPa·s at 25℃

[0097] pH: 8.9

[0098] Functionality: 3.6

[0099] Average molecular weight: 400.

[0100] Application Examples 1-6 and Comparative Examples are examples of preparing plastic track sample blocks.

[0101] Application Example 1

[0102] Preparation of Compound 1

[0103] According to Table 1, polyether polyol C2020, polyether polyol F3135, and iron oxide red were mixed and stirred for 0.5 hours. The mixture was then heated to 120°C, and long-chain chlorinated paraffin, dispersant BYK110, chain extender 1, antioxidant, UV absorber, and 600-mesh calcium powder were added. The mixture was ground and stirred for 0.5 hours, then vacuum dehydrated for 2 hours. The mixture was then cooled to 50°C, discharged, and sealed for storage to obtain composite material 1. The specific proportions of each addition are shown in Table 1.

[0104] Preparation of prepolymer

[0105] 50g C2020, 40g F3135, and 38g MDI-50 were reacted at 80℃ for 3 hours. After cooling to 60℃, 92g of No. 52 long-chain chlorinated paraffin was added and stirred evenly before discharging to obtain the prepolymer.

[0106] Preparation of plastic samples

[0107] Take 100g of prepolymer and 500g of composite material 1, then weigh 0.2g of bismuth thiocarbamate (manufacturer Sigma) and 0.6g of zinc thiocarbamate (manufacturer Alfasa) and mix them evenly. Within 10 minutes, pour the mixture evenly into a PTFE mold to form an elastic buffer layer with a thickness of 9-10mm.

[0108] Operation time test

[0109] According to the GB36246-2018 standard for plastic running tracks, the test operation time is determined by the time it takes for the prepolymer, composite material 1, and catalyst to start mixing and timing. After pouring into a PTFE mold, the surface is "scraped" and the time it takes for obvious tooth marks to appear. The running track industry usually requires an operation time of more than 30 minutes.

[0110] Mechanical property testing

[0111] The prepared plastic samples were cured in a constant temperature and humidity environment for 7 days. The tensile strength was tested according to the test method of the plastic running track standard GB / T10654-2001, and the hardness of the samples was tested using a Shore A hardness tester. The results are shown in Table 3.

[0112] Application Example 2

[0113] Referring to the method in Application Example 1, the only difference is that chain extender 1 is replaced with chain extender 2 of equal hydroxyl equivalent, while other operations and parameters remain unchanged. Plastic samples were prepared, and the operation time and mechanical property tests are shown in Tables 2 and 3.

[0114] Application Example 3

[0115] Referring to the method in Application Example 1, the only difference is that chain extender 1 is replaced with chain extender 3 of equal hydroxyl equivalent, while other operations and parameters remain unchanged. Plastic samples were prepared, and the operation time and mechanical property tests are shown in Tables 2 and 3.

[0116] Application Example 4

[0117] Referring to the method in Application Example 1, the only difference is that polyether polyols C2020 and F3135, and chain extender 1 are replaced with polyether polyols C2020, F3135, F3056D and chain extender 4 of equal hydroxyl equivalent, the amount of antioxidant and UV absorber used is reduced, and calcium powder is partially replaced with talc powder. Other operations and parameters remain unchanged, and plastic samples are prepared. The operation time and mechanical property tests are shown in Tables 2 and 3.

[0118] Application Example 5

[0119] Referring to the method in Application Example 1, the only difference is that polyether polyols C2020 and F3135, and chain extender 1 are replaced with polyether polyols C2020, F3135, F3056D and chain extender 5 of equal hydroxyl equivalent, the amount of antioxidant and UV absorber used is reduced, and calcium powder is partially replaced with talc powder. Other operations and parameters remain unchanged, and plastic samples are prepared. The operation time and mechanical property tests are shown in Tables 2 and 3.

[0120] Application Example 6

[0121] Referring to the method in Application Example 1, the only difference is that polyether polyols C2020 and F3135, and chain extender 1 are replaced with polyether polyols C2020 and F3056D with hydroxyl equivalents and chain extender 6, the amount of ultraviolet absorber used is reduced, and all calcium powder is replaced with talc powder. Other operations and parameters remain unchanged, and plastic blocks are prepared. The operation time and mechanical property tests are shown in Tables 2 and 3.

[0122] Comparative Example

[0123] Referring to the method in Application Example 1, the only difference is that the chain extender 1 and the polyether polyol are replaced with MOCA and polyether polyol with equal amounts of amino groups and hydroxyl groups. Other operations and parameters remain unchanged, and plastic samples are prepared. The operation time and mechanical property tests are shown in Tables 2 and 3.

[0124] Table 1. Formulations of the combined feeds in Application Examples 1-6, in g:

[0125]

[0126]

[0127] Table 2. Operation time test of plastic samples

[0128]

[0129] Table 3 Mechanical property tests of plastic samples

[0130]

[0131] According to the results in Table 2, the plastic samples prepared from the polyether polyols in Examples 1-6 exhibit suitable operating times and good elongation at break, demonstrating MOCA substitution capability and meeting industry performance and environmental protection requirements. Mechanical testing results of the plastic samples show that the performance of the plastic samples prepared from amino polyether polyols is close to that of the plastic samples prepared from MOCA, and they have certain advantages in improving track hardness. However, in the polyurethane track field, a hardness exceeding 60 HA is considered to affect elasticity and is therefore unsuitable. As shown in Table 2, using MOCA as a chain extender results in high hardness, which may lead to situations where the hardness is too high to be suitable for track applications during formulation adjustments. The formulation in this application has lower hardness and greater adaptability.

[0132] Those skilled in the art will understand that modifications or adjustments can be made to this invention under the guidance of this specification. These modifications or adjustments should also be within the scope defined by the claims of this invention.

Claims

1. A polyurethane plastic track, characterized by, Amino polyethers were used as chain extenders.

2. The synthetic track of claim 1, wherein, Its raw materials include component A, component B and catalyst, wherein component A includes polyurethane prepolymer or isocyanate component, and component B includes polyether polyol and chain extender; Preferably, the chain extender is an amino polyether polyol.

3. The synthetic track of claim 1, wherein, The mass ratio of component A, component B, and catalyst is 1:2-5:0.1-1%. Preferably, the polyurethane prepolymer is prepared by reacting isocyanate and polyether polyol.

4. The plastic track according to claim 1 or 2, wherein The method for preparing the polyurethane prepolymer includes: mixing isocyanate and polyether polyol, reacting at 80-95°C, stopping the reaction when NCO approaches the theoretical value, optionally adding a plasticizer, stirring and mixing evenly to obtain the polyurethane prepolymer. Preferably, the isocyanate is one or more selected from 2,4-diphenylmethane diisocyanate, 4,4-diphenylmethane diisocyanate, carbodiimide-modified diphenylmethane diisocyanate, and polymethylene polyphenyl isocyanate; Preferably, in the polyurethane prepolymer, the polyether polyol is selected from one or more of polyether polyols with a molecular weight of 1000-5000 g / mol, a functionality of 2, and a hydroxyl value of 20-120 mgKOH / g, and polyether polyols with a molecular weight of 3000-6000 g / mol, a functionality of 3, and a hydroxyl value of 25-60 mgKOH / g, and more preferably one or more of polyethylene oxide polyols and polypropylene oxide polyols.

5. The track of any one of claims 1-4, wherein, The B component also includes powder, optional plasticizer, and optional other additives.

6. The track of any one of claims 1-5, wherein, The other additives include one or more of pigments, dispersants, antioxidants, and ultraviolet absorbers; Preferably, component B comprises the following components in parts by weight: 5-20 parts of polyether polyol, 30-70 parts of powder, 0-30 parts of plasticizer, 0.5-7 parts of chain extender, 0-5 parts of pigment, 0-1 part of dispersant, 0-5 parts of antioxidant, and 0-5 parts of ultraviolet absorber. Preferably, component B comprises the following components in parts by weight: 5-20 parts of polyether polyol, 30-70 parts of powder, 5-30 parts of plasticizer, 0.5-7 parts of chain extender, 0-5 parts of pigment, 0-1 part of dispersant, 0-5 parts of antioxidant, and 0-5 parts of ultraviolet absorber. Preferably, the preparation method of component B is as follows: mixing polyether polyol and optional pigment, stirring for 0.5-1h until uniform, heating to 100-120°C, adding powder, optional plasticizer, chain extender, optional dispersant, optional antioxidant and optional UV absorber, grinding and stirring for 0.5-1h, vacuum dehydrating for 1-2h, cooling to 40-50°C, discharging and sealing for storage; Preferably, the polyether polyol in component B is selected from one or more of polyether polyols with a molecular weight of 1000-5000 g / mol, a functionality of 2, and a hydroxyl value of 20-120 mgKOH / g, and polyether polyols with a molecular weight of 400-6000 g / mol, a functionality of 3, and a hydroxyl value of 25-450 mgKOH / g. Preferably, the polyether polyol in component B is not an amino polyether polyol.

7. The track of any one of claims 1-6, wherein, The amino polyether polyol chain extender has a functionality of 2-4 and an average weight-average molecular weight of 150-1000. Preferably, the amino polyether polyol chain extender is an amino polyether polyol prepared by ring-opening polymerization of epoxide alkane with amine as the initiator; Preferably, the preparation method of the amino polyether polyol includes: adding an initiator into a reactor and mixing it uniformly; adding an alkaline catalyst and an epoxide alkane under an inert atmosphere; carrying out an epoxide ring-opening reaction at a reaction temperature; ripening and degassing after the feeding is completed; and optionally undergoing purification post-treatment or directly obtaining the polyether polyol.

8. The synthetic track of claim 7, wherein, The initiator includes an aromatic amine; Preferably, the aromatic amine is selected from one or more of aniline, toluene, ethylaniline, propylaniline, butylaniline, dimethylaniline, 2-methoxyaniline, mesitylene, phenethylamine, diphenylmethylamine, phenylenediamine, N-methylphenylenediamine, diaminotoluene, dimethylphenylenediamine, N,N-dimethylphenylenediamine, N,N-diethylphenylenediamine, diethyltoluenediamine, tetramethylphenylenediamine, and p-diaminobiphenyl, with aniline, phenylenediamine, diaminotoluene, N,N-dimethylphenylenediamine, and p-diaminobiphenyl being the most preferred. Preferably, the initiator further includes an aliphatic amine, including but not limited to one or more of ethanolamine, diethanolamine, triethanolamine, ethylenediamine, cyclohexylamine, hexamethylenediamine, and cyclohexanediamine; Preferably, the aromatic amine in the initiator accounts for more than 20% by mass, and more preferably, the aromatic amine accounts for more than 50% by mass. Preferably, the alkaline catalyst is one or more of the following: potassium hydroxide, sodium hydroxide, cesium hydroxide, dimethylamine, trimethylamine, dipropylamine, tripropylamine, N,N-dimethylcyclohexylamine, N-methyl-N-ethylcyclohexylamine, N-methyl-N-propylcyclohexylamine, N,N-diethylcyclohexylamine, N,N-dimethyloctadecylamine, pentamethyldiethylenetriamine, N-methyldiethanolamine, 2-dimethylethanolamine, 1,4-dimethylpiperazine, N,N-dimethylbenzylamine, N,N-dimethylmethylamine, dodecyldimethyltertiary amine, imidazole, N-methylimidazolium, 2-methylimidazolium, 2-ethylimidazolium, 4-methylimidazolium, and 2-ethyl-4-methylimidazolium. Preferably, the epoxide includes one or more of ethylene oxide, propylene oxide, and butane oxide.

9. The track of any of claims 1-8, wherein, The powder includes one or more of heavy calcium carbonate, talc, and light calcium carbonate; preferably, the particle size of the powder is 400-1250 mesh. Preferably, the plasticizer is one or more selected from chlorinated paraffin, methyl palmitate, dioctyl terephthalate, and tributyl acetyl citrate; Preferably, the pigment includes iron oxide red, iron oxide green, and phthalocyanine blue; Preferably, the antioxidants include antioxidant 1076, antioxidant 1010, and antioxidant 1135; Preferably, the ultraviolet absorber includes ultraviolet absorber UV-531, ultraviolet absorber UV-P, ultraviolet absorber UV-1, and ultraviolet absorber UV-9; Preferably, the dispersant includes polyether-modified polysiloxane, carboxylic acid ester block polymer, and polyacid ester block copolymer.

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