CN117507442B - Manufacturing method of double-sided tooth synchronous belt - Google Patents
Manufacturing method of double-sided tooth synchronous belt Download PDFInfo
- Publication number
- CN117507442B CN117507442B CN202311270062.XA CN202311270062A CN117507442B CN 117507442 B CN117507442 B CN 117507442B CN 202311270062 A CN202311270062 A CN 202311270062A CN 117507442 B CN117507442 B CN 117507442B
- Authority
- CN
- China
- Prior art keywords
- scandium
- synchronous belt
- porous silicon
- double
- microspheres
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 239000004005 microsphere Substances 0.000 claims abstract description 62
- 229910021426 porous silicon Inorganic materials 0.000 claims abstract description 56
- 229920002635 polyurethane Polymers 0.000 claims abstract description 39
- 239000004814 polyurethane Substances 0.000 claims abstract description 39
- CPOIJYXGUPKOCR-UHFFFAOYSA-N [Si][Sc] Chemical compound [Si][Sc] CPOIJYXGUPKOCR-UHFFFAOYSA-N 0.000 claims abstract description 31
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 229910052706 scandium Inorganic materials 0.000 claims abstract description 26
- SIXSYDAISGFNSX-UHFFFAOYSA-N scandium atom Chemical compound [Sc] SIXSYDAISGFNSX-UHFFFAOYSA-N 0.000 claims abstract description 26
- GYZLOYUZLJXAJU-UHFFFAOYSA-N diglycidyl ether Chemical compound C1OC1COCC1CO1 GYZLOYUZLJXAJU-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims abstract description 21
- ZTCRAKYLWCYMRH-UHFFFAOYSA-N 2-(oxiran-2-ylmethoxy)phenol Chemical compound OC1=CC=CC=C1OCC1OC1 ZTCRAKYLWCYMRH-UHFFFAOYSA-N 0.000 claims abstract description 17
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 14
- 238000005576 amination reaction Methods 0.000 claims abstract description 5
- 229910052751 metal Inorganic materials 0.000 claims abstract description 4
- 239000002184 metal Substances 0.000 claims abstract description 4
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 54
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 54
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 38
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 claims description 27
- 229920000909 polytetrahydrofuran Polymers 0.000 claims description 27
- 238000000034 method Methods 0.000 claims description 22
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 21
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 20
- 238000010438 heat treatment Methods 0.000 claims description 20
- 239000000243 solution Substances 0.000 claims description 20
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 238000003756 stirring Methods 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- WYTZZXDRDKSJID-UHFFFAOYSA-N (3-aminopropyl)triethoxysilane Chemical compound CCO[Si](OCC)(OCC)CCCN WYTZZXDRDKSJID-UHFFFAOYSA-N 0.000 claims description 14
- 239000007864 aqueous solution Substances 0.000 claims description 14
- 239000003054 catalyst Substances 0.000 claims description 14
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 13
- 238000002156 mixing Methods 0.000 claims description 13
- DBTMQFKUVICLQN-UHFFFAOYSA-K scandium(3+);triacetate Chemical compound [Sc+3].CC([O-])=O.CC([O-])=O.CC([O-])=O DBTMQFKUVICLQN-UHFFFAOYSA-K 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 10
- KXBFLNPZHXDQLV-UHFFFAOYSA-N [cyclohexyl(diisocyanato)methyl]cyclohexane Chemical compound C1CCCCC1C(N=C=O)(N=C=O)C1CCCCC1 KXBFLNPZHXDQLV-UHFFFAOYSA-N 0.000 claims description 10
- 239000007806 chemical reaction intermediate Substances 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 10
- 239000004970 Chain extender Substances 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 239000007789 gas Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000003607 modifier Substances 0.000 claims description 8
- 239000006185 dispersion Substances 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 7
- 230000035484 reaction time Effects 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- UKLDJPRMSDWDSL-UHFFFAOYSA-L [dibutyl(dodecanoyloxy)stannyl] dodecanoate Chemical compound CCCCCCCCCCCC(=O)O[Sn](CCCC)(CCCC)OC(=O)CCCCCCCCCCC UKLDJPRMSDWDSL-UHFFFAOYSA-L 0.000 claims description 5
- 239000012975 dibutyltin dilaurate Substances 0.000 claims description 5
- 239000011261 inert gas Substances 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 238000001132 ultrasonic dispersion Methods 0.000 claims description 5
- WERYXYBDKMZEQL-UHFFFAOYSA-N butane-1,4-diol Chemical group OCCCCO WERYXYBDKMZEQL-UHFFFAOYSA-N 0.000 claims description 4
- 230000018044 dehydration Effects 0.000 claims description 4
- 238000006297 dehydration reaction Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 claims description 3
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 2
- 229920000570 polyether Polymers 0.000 claims description 2
- 229920005862 polyol Polymers 0.000 claims description 2
- 150000003077 polyols Chemical class 0.000 claims description 2
- 230000000630 rising effect Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims description 2
- 239000000463 material Substances 0.000 abstract description 13
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000015572 biosynthetic process Effects 0.000 abstract description 3
- 238000003786 synthesis reaction Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 238000001914 filtration Methods 0.000 description 6
- 238000005406 washing Methods 0.000 description 6
- 239000003513 alkali Substances 0.000 description 5
- 238000005299 abrasion Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000010306 acid treatment Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004381 surface treatment Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Landscapes
- Polyurethanes Or Polyureas (AREA)
Abstract
The invention relates to a manufacturing method of a double-sided tooth synchronous belt, which comprises the following steps: step 1, preparing porous silicon carbide scandium microspheres: step 2, preparing amination porous silicon carbide scandium microspheres; step 3, preparing a glycidyl ether modified polyurethane prepolymer; step 4, preparing modified polyurethane; and 5, preparing the double-sided tooth synchronous belt. The invention prepares a double-sided tooth synchronous belt, and the synchronous belt is formed by taking a metal tensile body as a framework and pouring a modified polyurethane material. The polyurethane material is modified by adding 2-hydroxy phenyl glycidyl ether and introducing amino porous silicon scandium carbide microspheres in the synthesis of polyurethane, and the modified polyurethane material has higher mechanical strength, heat resistance, wear resistance and corrosion resistance than the conventional polyurethane.
Description
Technical Field
The invention relates to the field of synchronous belts, in particular to a manufacturing method of a double-sided tooth synchronous belt.
Background
The synchronous belt is an annular belt with equidistant teeth on the inner peripheral surface, and when in rotation, the belt teeth are meshed with tooth grooves of the gears to transmit power. The synchronous belt integrates the advantages of belt transmission, chain transmission and gear transmission, and has the advantages of high transmission efficiency, accurate transmission ratio, large transmission ratio range, stable transmission, small acting force on a shaft, low noise, energy conservation and the like. The double-sided tooth synchronous belt is mainly used for double-sided transmission and has the characteristics of synchronization, synchronization and double-effect rate.
Early synchronous belt main bodies are mostly made of polyurethane materials, and polyurethane has good elasticity, simple process and convenient molding. However, polyurethane has poor heat resistance, is easy to be sticky at about 70 ℃, and is easy to be soft when the temperature is higher; and the corrosion resistance performance is insufficient, and the synchronous belt is easy to hydrolyze under a severe environment, so that the strength of the synchronous belt is obviously reduced, and the application of the synchronous belt to the synchronous belt is severely limited.
Therefore, in order to enhance the properties of polyurethane, which enables better performance in synchronous belt applications, a series of modifications to the polyurethane material are required.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a manufacturing method of a double-sided tooth synchronous belt.
The aim of the invention is realized by adopting the following technical scheme:
the manufacturing method of the double-sided tooth synchronous belt comprises the following steps:
Step 1, preparing porous silicon carbide scandium microspheres:
Scandium acetate is mixed and stirred uniformly in deionized water, activated carbon particles are added, ultrasonic dispersion is uniform, activated carbon dispersion liquid is formed, tetraethyl silicate solution is added dropwise, temperature rising reaction is carried out, a product is dried after the reaction is finished, and then the product is sintered in a muffle furnace, so that porous silicon carbide scandium microspheres are obtained;
step2, preparing amino porous silicon carbide scandium microspheres:
Treating the porous silicon scandium carbide microspheres in a hydrogen peroxide solution to obtain hydroxylated porous silicon scandium carbide microspheres; then mixing the mixture with an aqueous solution of gamma-aminopropyl triethoxysilane, and heating and stirring the mixture to obtain aminated porous silicon carbide scandium microspheres;
step3, preparing a glycidyl ether modified polyurethane prepolymer:
Vacuum dewatering polytetrahydrofuran ether glycol, and then mixing with 2-hydroxyphenyl glycidyl ether to obtain a mixed reaction intermediate; then adding dicyclohexylmethane diisocyanate and a catalyst into the mixed reaction intermediate solution, and performing a prepolymerization reaction to obtain a glycidyl ether modified polyurethane prepolymer;
step 4, preparing modified polyurethane:
adding N, N-dimethylformamide into the glycidyl ether modified polyurethane prepolymer for viscosity reduction, uniformly stirring, adding a chain extender and a modifier for amination of porous silicon carbide scandium microspheres, keeping the temperature, stirring, reacting, and standing to obtain modified polyurethane;
Step 5, preparing a double-sided tooth synchronous belt:
And (3) placing the modified polyurethane into a mold containing a metal tensile body, heating and pressurizing the mold, molding and demolding to obtain the required double-sided tooth synchronous belt.
Preferably, in the step 1, the particle size of the activated carbon particles is 10-20 μm, and the mass ratio of scandium acetate, the activated carbon particles and deionized water is 0.22-0.44:1:20-30.
Preferably, in the step 1, the tetraethyl silicate solution is an ethanol solution of tetraethyl silicate, and the mass ratio of the tetraethyl silicate to the ethanol is 1:1.5-2.5; the mass ratio of the tetraethyl silicate solution to the activated carbon dispersion is 0.35-0.55:1.
Preferably, in the step1, the dripping speed of the tetraethyl silicate solution is 40-60 drops/min.
Preferably, in the step 1, the temperature of the heating reaction is 50-70 ℃ and the reaction time is 2-3h; drying is drying in an oven at 80-100deg.C.
Preferably, in the step 1, the sintering temperature in the muffle furnace is 900-1000 ℃, the sintering time is 3-5h, the heating rate is 3-6 ℃/min, and inert gas is introduced as shielding gas in the sintering process.
Preferably, in the step 2, the mass percentage of the hydrogen peroxide solution is 20% -30%, the treatment temperature in the hydrogen peroxide solution is 65-85 ℃ and the treatment time is 2-5h; the mass ratio of the porous silicon scandium carbide microspheres to the hydrogen peroxide solution is 1:10-20.
Preferably, in the step 2, the mass percentage of the aqueous solution of the gamma-aminopropyl triethoxysilane is 2% -6%, and the mass ratio of the hydroxylated porous silicon carbide scandium microsphere to the aqueous solution of the gamma-aminopropyl triethoxysilane is 1:10-20.
Preferably, in the step 2, the treatment temperature of the hydroxylated porous silicon scandium carbide microspheres in the aqueous solution of gamma-aminopropyl triethoxysilane is 45-55 ℃ and the treatment time is 5-10h.
Preferably, in the step 3, the temperature of the polyether polyol for vacuum dehydration is 110-120 ℃, and the temperature is reduced to 55-60 ℃ after vacuum dehydration.
Preferably, in the step 3, the polytetrahydrofuran ether glycol is polytetrahydrofuran ether glycol 2000, and the mixing of the polytetrahydrofuran ether glycol and the 2-hydroxyphenyl glycidyl ether is performed under the protection of nitrogen, and the mixing temperature is 55-60 ℃ and the mixing time is 15-30min.
Preferably, in the step 3, the mass ratio of polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate and 2-hydroxyphenyl glycidyl ether is 60-80:24-36:5-10.
Preferably, in the step 3, the catalyst is an organotin catalyst, specifically dibutyl tin dilaurate, and the addition amount of the catalyst is 1% -5% of the mass of the polytetrahydrofuran ether glycol.
Preferably, in the step 3, the reaction temperature of the prepolymerization is 85-90 ℃ and the reaction time is 2-4h.
Preferably, in the step 4, adding N, N-dimethylformamide to reduce the viscosity until the solid content is 60% -80%; the chain extender is 1, 4-butanediol, and the addition amount of the chain extender is 6-10% of the mass of the glycidyl ether modified polyurethane prepolymer; the addition amount of the modifier amino porous silicon scandium carbide microsphere is 8-16% of the mass of the glycidyl ether modified polyurethane prepolymer.
Preferably, in the step 4, after adding the chain extender and the modifier, the mixture is stirred and reacted at 85-90 ℃ for 0.5-1h, and then is kept stand at 75-95 ℃ for at least 48h.
Preferably, in the step 5, the temperature in the die is raised to 100-120 ℃ and the pressure is increased to 15-20MPa.
The beneficial effects of the invention are as follows:
1. The invention prepares a double-sided tooth synchronous belt, and the synchronous belt is formed by taking a metal tensile body as a framework and pouring a modified polyurethane material. The polyurethane material is modified by adding 2-hydroxy phenyl glycidyl ether and introducing amino porous silicon scandium carbide microspheres in the synthesis of polyurethane, and the modified polyurethane material has higher mechanical strength, heat resistance, wear resistance and corrosion resistance than the conventional polyurethane.
2. Before the prepolymerization of polytetrahydrofuran ether glycol and dicyclohexylmethane diisocyanate, 2-hydroxyphenyl glycidyl ether is added for introducing glycidyl ether groups and hydroxyl groups, and after the prepolymerization of polytetrahydrofuran ether glycol and dicyclohexylmethane diisocyanate, the polytetrahydrofuran ether glycol and dicyclohexylmethane diisocyanate are subjected to recombination reaction with hydroxyl-OH in the 2-hydroxyphenyl glycidyl ether to obtain the polyurethane prepolymer containing glycidyl ether groups.
3. Adding a chain extender into the polyurethane prepolymer to carry out end-capping reaction on redundant-NCO, and simultaneously adding a modifier to combine with glycidyl ether groups to introduce porous microspheres into the polymer. The modifier is an amination porous silicon carbide scandium microsphere, is a porous microsphere material with the surface rich in amino, and is introduced into the polymer through the combination of the amino and the glycidyl ether group.
4. The porous microsphere introduced into the polyurethane is a porous silicon scandium carbide microsphere, scandium element is introduced into the synthesis of silicon carbide, and the prepared silicon scandium carbide microsphere has better enhancement performance on the performance of the polyurethane compared with the silicon carbide microsphere, and is mainly reflected in the aspects of mechanical strength, wear resistance and corrosion resistance. Amino groups are introduced into the surface of the microsphere through surface treatment and are combined with glycidyl ether groups introduced in the polyurethane prepolymerization process to form crosslinking so as to modify the polyurethane.
Drawings
The invention will be further described with reference to the accompanying drawings, in which embodiments do not constitute any limitation of the invention, and other drawings can be obtained by one of ordinary skill in the art without inventive effort from the following drawings.
FIG. 1 is an infrared spectrum of a modified polyurethane prepared in example 1 of the present invention (a represents a glycidyl ether modified polyurethane prepolymer, b represents a modified polyurethane, and c represents 4,4' -dicyclohexylmethane diisocyanate).
Detailed Description
The technical scheme of the invention is described below through specific examples. It is to be understood that the mention of one or more method steps of the present invention does not exclude the presence of other method steps before and after the combination step or that other method steps may be interposed between these explicitly mentioned steps; it should also be understood that these examples are illustrative of the present invention and are not intended to limit the scope of the present invention. Moreover, unless otherwise indicated, the numbering of the method steps is merely a convenient tool for identifying the method steps and is not intended to limit the order of arrangement of the method steps or to limit the scope of the invention in which the invention may be practiced, as such changes or modifications in their relative relationships may be regarded as within the scope of the invention without substantial modification to the technical matter.
In order to better understand the above technical solution, exemplary embodiments of the present invention are described in more detail below. While exemplary embodiments of the invention are shown, it should be understood that the invention may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The invention is further described with reference to the following examples.
Example 1
The manufacturing method of the double-sided tooth synchronous belt comprises the following steps:
Step 1, preparing porous silicon carbide scandium microspheres:
Scandium acetate is mixed and stirred uniformly in deionized water, activated carbon particles with the particle size of 10-20 mu m are added, ultrasonic dispersion is uniform, the mass ratio of scandium acetate to activated carbon particles to deionized water is 0.33:1:25, an ethanol solution of tetraethyl silicate is added dropwise, the mass ratio of tetraethyl silicate to ethanol is 1:2, the dropping speed is 50 drops/min, the mass ratio of the tetraethyl silicate solution to the activated carbon dispersion is 0.45:1, the temperature is raised to 60 ℃, the reaction time is 2.5h, the product is dried in an oven at 90 ℃ after the reaction is finished, then sintered in a muffle furnace at 950 ℃ for 4h, inert gas is introduced as a shielding gas in the sintering process, and the heating speed is 5 ℃/min, thus obtaining the porous silicon carbide scandium microspheres.
Step2, preparing amino porous silicon carbide scandium microspheres:
Treating the porous silicon scandium carbide microsphere for 3 hours at 75 ℃ in a hydrogen peroxide solution with the mass percentage of 25%, wherein the mass ratio of the porous silicon scandium carbide microsphere to the hydrogen peroxide solution is 1:15, filtering, washing with water, and drying to obtain a hydroxylated porous silicon scandium carbide microsphere; and then mixing the mixture with 4% of gamma-aminopropyl triethoxysilane aqueous solution, wherein the mass ratio of the hydroxylated porous silicon scandium carbide microspheres to the gamma-aminopropyl triethoxysilane aqueous solution is 1:15, heating to 50 ℃, stirring, filtering, washing with water, and drying to obtain the amino porous silicon scandium carbide microspheres.
Step3, preparing a glycidyl ether modified polyurethane prepolymer:
Weighing polytetrahydrofuran ether glycol 2000, placing the polytetrahydrofuran ether glycol 2000 into a three-neck flask, heating to 120 ℃, removing moisture under vacuum conditions, cooling to 60 ℃, introducing nitrogen as a shielding gas, adding 2-hydroxyphenyl glycidyl ether, and stirring for 25min under heat preservation to obtain a mixed reaction intermediate; dropwise adding 4,4' -dicyclohexylmethane diisocyanate into the mixed reaction intermediate liquid, fully stirring uniformly, adding a catalyst dibutyltin dilaurate, wherein the addition amount of the catalyst is 3% of the mass of polytetrahydrofuran ether glycol, heating to 85 ℃, and keeping the temperature and stirring for 3 hours to obtain a glycidyl ether modified polyurethane prepolymer; the mass ratio of polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate and 2-hydroxyphenyl glycidyl ether is 70:30:8.
Step 4, preparing modified polyurethane:
Adding N, N-dimethylformamide into the glycidyl ether modified polyurethane prepolymer to reduce the viscosity until the solid content is 70%, uniformly stirring, and then adding a chain extender 1, 4-butanediol and a modifier amino porous silicon carbide scandium microsphere, wherein the addition amount of the chain extender is 8% of the mass of the glycidyl ether modified polyurethane prepolymer; the addition amount of the modifier amination porous silicon scandium carbide microsphere is 12% of the mass of the glycidyl ether modified polyurethane prepolymer, the heat preservation and stirring are carried out for 0.8h, and then the modified polyurethane is obtained after the mixture is stood for at least 48h at the temperature of 85 ℃.
Step 5, preparing a double-sided tooth synchronous belt:
And (3) placing the modified polyurethane into a die containing a metal tensile body, heating to 110 ℃ in the die, pressurizing to 20MPa, molding and demolding to obtain the required double-sided tooth synchronous belt.
For the prepared modified polyurethane, a spectrogram is made on an FTIR infrared spectrometer in the embodiment, and as shown in figure 1, a represents a glycidyl ether modified polyurethane prepolymer, b represents modified polyurethane, and c represents 4,4' -dicyclohexylmethane diisocyanate. From the spectrogram, a large-amplitude-NCO stretching vibration peak appears at 2238cm-1 of the c curve, the stretching intensity of the a curve is greatly reduced, the a curve is consumed by a large amount of reaction, and the b curve has almost no stretching intensity, so that the a curve has complete reaction; in addition, a carbon-oxygen bond vibration peak of carbonyl appears at 1780cm < -1 > of the a curve, which indicates that glycidyl ether groups are introduced; a secondary amine-NH stretching vibration peak appears at 2970cm-1 of the b curve, indicating the introduction of an-NH bond. From the overall spectrum of the b curve, it can be demonstrated that the modified polyurethane according to the invention has been prepared.
Example 2
The manufacturing method of the double-sided tooth synchronous belt comprises the following steps:
Step 1, preparing porous silicon carbide scandium microspheres:
Scandium acetate is mixed and stirred uniformly in deionized water, activated carbon particles with the particle size of 10-20 mu m are added, ultrasonic dispersion is uniform, the mass ratio of scandium acetate to activated carbon particles to deionized water is 0.22:1:20, an ethanol solution of tetraethyl silicate is added dropwise, the mass ratio of tetraethyl silicate to ethanol is 1:1.5, the dropping speed is 40 drops/min, the mass ratio of the tetraethyl silicate solution to the activated carbon dispersion is 0.35:1, the temperature is raised to 50 ℃, the reaction time is 2h, the product is dried in an oven at 80 ℃ after the reaction is finished, then sintered in a muffle furnace at 900 ℃ for 3h, inert gas is introduced as a shielding gas in the sintering process, and the heating speed is 3 ℃/min, thus obtaining the porous silicon carbide scandium microspheres.
Step2, preparing amino porous silicon carbide scandium microspheres:
Treating the porous silicon scandium carbide microsphere for 2 hours at 65 ℃ in a hydrogen peroxide solution with the mass percentage of 20%, wherein the mass ratio of the porous silicon scandium carbide microsphere to the hydrogen peroxide solution is 1:10, filtering, washing with water, and drying to obtain a hydroxylated porous silicon scandium carbide microsphere; then mixing with 2% of gamma-aminopropyl triethoxysilane aqueous solution, wherein the mass ratio of the hydroxylated porous silicon scandium carbide microspheres to the gamma-aminopropyl triethoxysilane aqueous solution is 1:10, heating to 45 ℃, stirring, filtering, washing with water, and drying to obtain the amino porous silicon scandium carbide microspheres.
Step3, preparing a glycidyl ether modified polyurethane prepolymer:
Weighing polytetrahydrofuran ether glycol 2000, placing the polytetrahydrofuran ether glycol 2000 into a three-neck flask, heating to 110 ℃, removing moisture under vacuum conditions, cooling to 55 ℃, introducing nitrogen as a shielding gas, adding 2-hydroxyphenyl glycidyl ether, and stirring for 15min under heat preservation to obtain a mixed reaction intermediate; dropwise adding 4,4' -dicyclohexylmethane diisocyanate into the mixed reaction intermediate liquid, fully stirring uniformly, adding a catalyst dibutyltin dilaurate, wherein the addition amount of the catalyst is 1% of the mass of polytetrahydrofuran ether glycol, heating to 85 ℃, and keeping the temperature and stirring for 2 hours to obtain a glycidyl ether modified polyurethane prepolymer; the mass ratio of polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate and 2-hydroxyphenyl glycidyl ether is 60:24:5.
Step 4, preparing modified polyurethane:
Adding N, N-dimethylformamide into the glycidyl ether modified polyurethane prepolymer to reduce the viscosity until the solid content is 60%, uniformly stirring, and then adding a chain extender 1, 4-butanediol and a modifier amino porous silicon carbide scandium microsphere, wherein the addition amount of the chain extender is 6% of the mass of the glycidyl ether modified polyurethane prepolymer; the addition amount of the modifier amination porous silicon scandium carbide microsphere is 8% of the mass of the glycidyl ether modified polyurethane prepolymer, the polyurethane prepolymer is stirred for 0.5h under heat preservation, and then the polyurethane prepolymer is obtained after standing for at least 48h at the temperature of 75 ℃.
Step 5, preparing a double-sided tooth synchronous belt:
And (3) placing the modified polyurethane into a mould containing a metal tensile body, heating to 100 ℃ in the mould, pressurizing to 15MPa, forming and demoulding to obtain the required double-sided tooth synchronous belt.
Example 3
The manufacturing method of the double-sided tooth synchronous belt comprises the following steps:
Step 1, preparing porous silicon carbide scandium microspheres:
scandium acetate is mixed and stirred uniformly in deionized water, activated carbon particles with the particle size of 10-20 mu m are added, ultrasonic dispersion is uniform, the mass ratio of scandium acetate to activated carbon particles to deionized water is 0.44:1:30, an ethanol solution of tetraethyl silicate is added dropwise, the mass ratio of tetraethyl silicate to ethanol is 1:2.5, the dropping speed is 60 drops/min, the mass ratio of the tetraethyl silicate solution to the activated carbon dispersion is 0.55:1, the temperature is raised to 70 ℃, the reaction time is 3 hours, the product is dried in an oven at 100 ℃ after the reaction is finished, then sintered in a muffle furnace at 1000 ℃ for 5 hours, inert gas is introduced as a shielding gas in the sintering process, and the heating speed is 6 ℃/min, so that the porous silicon carbide scandium microspheres are obtained.
Step2, preparing amino porous silicon carbide scandium microspheres:
Treating the porous silicon scandium carbide microsphere for 5 hours at 85 ℃ in a 30% hydrogen peroxide solution with the mass percentage of 1:20, filtering, washing with water, and drying to obtain a hydroxylated porous silicon scandium carbide microsphere; and then mixing the mixture with a 6% gamma-aminopropyl triethoxysilane aqueous solution, wherein the mass ratio of the hydroxylated porous silicon scandium carbide microspheres to the gamma-aminopropyl triethoxysilane aqueous solution is 1:20, heating to 55 ℃, stirring, filtering, washing with water, and drying to obtain the amino porous silicon scandium carbide microspheres.
Step3, preparing a glycidyl ether modified polyurethane prepolymer:
Weighing polytetrahydrofuran ether glycol 2000, placing the polytetrahydrofuran ether glycol 2000 into a three-neck flask, heating to 120 ℃, removing moisture under vacuum conditions, cooling to 60 ℃, introducing nitrogen as a shielding gas, adding 2-hydroxyphenyl glycidyl ether, and stirring for 30min under heat preservation to obtain a mixed reaction intermediate; dropwise adding 4,4' -dicyclohexylmethane diisocyanate into the mixed reaction intermediate liquid, fully stirring uniformly, adding a catalyst dibutyltin dilaurate, wherein the addition amount of the catalyst is 5% of the mass of polytetrahydrofuran ether glycol, heating to 90 ℃, and keeping the temperature and stirring for 4 hours to obtain a glycidyl ether modified polyurethane prepolymer; the mass ratio of polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate and 2-hydroxyphenyl glycidyl ether is 80:36:10.
Step 4, preparing modified polyurethane:
Adding N, N-dimethylformamide into the glycidyl ether modified polyurethane prepolymer to reduce the viscosity until the solid content is 80%, uniformly stirring, and then adding a chain extender 1, 4-butanediol and a modifier amino porous silicon carbide scandium microsphere, wherein the addition amount of the chain extender is 10% of the mass of the glycidyl ether modified polyurethane prepolymer; the addition amount of the modifier amination porous silicon scandium carbide microsphere is 16% of the mass of the glycidyl ether modified polyurethane prepolymer, the mixture is stirred for 1h under heat preservation, and then the mixture is kept stand for at least 48h at the temperature of 95 ℃ to obtain the modified polyurethane.
Step 5, preparing a double-sided tooth synchronous belt:
and (3) placing the modified polyurethane into a die containing a metal tensile body, heating to 120 ℃ in the die, pressurizing to 20MPa, molding and demolding to obtain the required double-sided tooth synchronous belt.
Comparative example 1
The modified polyurethane was prepared in the same manner as in example 1, except that 2-hydroxyphenyl glycidyl ether and amino porous silicon scandium carbide microspheres were not added, and the other was the same as in example 1.
Comparative example 2
The modified polyurethane was prepared in the same manner as in example 1, except that the aminated porous silicon scandium carbide microsphere was not added, and the rest was the same as in example 1.
Comparative example 3
The modified polyurethane was prepared in the same manner as in example 1 except that the aminated porous silicon carbide scandium microspheres were replaced with aminated porous silicon carbide microspheres, and the rest was the same as in example 1. The aminated porous silicon carbide microspheres were prepared by removing scandium acetate (i.e., without introducing scandium element) on the basis of example 1, and the rest was the same as in example 1.
Experimental example
The material properties of the modified polyurethanes prepared in example 1 and comparative examples 1 to 3 were examined in relation to each other.
The detecting content comprises the following steps: strength (tensile strength), toughness (notched impact strength), abrasion resistance (wear resistance), high and low temperature resistance, and flame retardancy (oxygen index).
The tensile strength is measured by GBT1040.5-2008, which refers to the measurement of the tensile property of plastics.
The detection of notch impact strength is referred to in GB/T1043.1-2008 determination of impact properties of Plastic simple beams.
The abrasion loss is detected by referring to GB/T3960-2016 plastic sliding friction abrasion test method, the temperature is 23+/-5 ℃, the humidity is 50+/-5%, the load is 196N, the time is 2h, and the rotation is 200 r/min.
The Shore D hardness at 60 ℃ is the Shore D hardness performance of the steel under the environment of 70 ℃.
The acid treatment is carried out by immersing in 0.5mol/L hydrochloric acid for 72 hours, the alkali treatment is carried out by immersing in 0.5mol/L sodium hydroxide solution for 72 hours, drying after the acid treatment or alkali treatment, detecting the tensile strength, and calculating the change rate compared with the original tensile strength.
The detection results are shown in the following table:
| Tensile Strength (MPa) | Notched impact strength (kJ/m 2) | Wearing capacity (mg) | Shore D hardness at 70 DEG C | Tensile Strength Change Rate (%) | Tensile Strength Change Rate after alkali treatment (%) | |
| Example 1 | 71.5 | 11.2 | 1.9 | 81 | -3.7 | -5.4 |
| Comparative example 1 | 54.3 | 7.4 | 3.7 | 59 | -8.6 | -11.2 |
| Comparative example 2 | 60.9 | 8.5 | 3.2 | 65 | -6.4 | -8.5 |
| Comparative example 3 | 67.6 | 10.7 | 2.4 | 77 | -3.9 | -6.0 |
From the test results in table 1, it can be seen that the modified polyurethane material prepared in example 1 of the present invention is not only higher in strength, stronger in toughness, but also excellent in abrasion resistance. The hardness is higher at high temperature, which indicates that the alloy is not easy to soften at high temperature and has stronger high temperature resistance. In addition, after acid and alkali treatment, the change rate of tensile strength is smaller, which indicates that the acid and alkali corrosion resistance performance is strong.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms should not be understood as necessarily being directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. The manufacturing method of the double-sided tooth synchronous belt is characterized by comprising the following steps of:
Step 1, preparing porous silicon carbide scandium microspheres:
Scandium acetate is mixed and stirred uniformly in deionized water, activated carbon particles are added, ultrasonic dispersion is uniform, activated carbon dispersion liquid is formed, tetraethyl silicate solution is added dropwise, temperature rising reaction is carried out, a product is dried after the reaction is finished, and then the product is sintered in a muffle furnace, so that porous silicon carbide scandium microspheres are obtained;
step2, preparing amino porous silicon carbide scandium microspheres:
Treating the porous silicon scandium carbide microspheres in a hydrogen peroxide solution to obtain hydroxylated porous silicon scandium carbide microspheres; then mixing the mixture with an aqueous solution of gamma-aminopropyl triethoxysilane, and heating and stirring the mixture to obtain aminated porous silicon carbide scandium microspheres;
step3, preparing a glycidyl ether modified polyurethane prepolymer:
Vacuum dewatering polytetrahydrofuran ether glycol, and then mixing with 2-hydroxyphenyl glycidyl ether to obtain a mixed reaction intermediate; then adding dicyclohexylmethane diisocyanate and a catalyst into the mixed reaction intermediate solution, and performing a prepolymerization reaction to obtain a glycidyl ether modified polyurethane prepolymer;
step 4, preparing modified polyurethane:
adding N, N-dimethylformamide into the glycidyl ether modified polyurethane prepolymer for viscosity reduction, uniformly stirring, adding a chain extender and a modifier for amination of porous silicon carbide scandium microspheres, keeping the temperature, stirring, reacting, and standing to obtain modified polyurethane;
Step 5, preparing a double-sided tooth synchronous belt:
And (3) placing the modified polyurethane into a mold containing a metal tensile body, heating and pressurizing the mold, molding and demolding to obtain the required double-sided tooth synchronous belt.
2. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 1, the particle size of the activated carbon particles is 10-20 μm, and the mass ratio of scandium acetate, the activated carbon particles and deionized water is 0.22-0.44:1:20-30; the tetraethyl silicate solution is ethanol solution of tetraethyl silicate, and the mass ratio of the tetraethyl silicate to the ethanol is 1:1.5-2.5; the mass ratio of the tetraethyl silicate solution to the activated carbon dispersion liquid is 0.35-0.55:1; the dripping speed of the tetraethyl silicate solution is 40-60 drops/min.
3. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 1, the temperature of the heating reaction is 50-70 ℃ and the reaction time is 2-3h; drying in an oven at 80-100deg.C; the sintering temperature in the muffle furnace is 900-1000 ℃, the sintering time is 3-5h, the heating speed is 3-6 ℃/min, and inert gas is introduced as shielding gas in the sintering process.
4. The method for manufacturing the double-sided tooth synchronous belt according to claim 1, wherein in the step 2, the mass percentage of the hydrogen peroxide solution is 20% -30%, the treatment temperature in the hydrogen peroxide solution is 65-85 ℃, and the treatment time is 2-5h; the mass ratio of the porous silicon scandium carbide microspheres to the hydrogen peroxide solution is 1:10-20.
5. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 2, the mass percentage of the aqueous solution of gamma-aminopropyl triethoxysilane is 2% -6%, and the mass ratio of the hydroxylated porous silicon scandium carbide microspheres to the aqueous solution of gamma-aminopropyl triethoxysilane is 1:10-20; the treatment temperature of the hydroxylated porous silicon scandium carbide microsphere in the aqueous solution of gamma-aminopropyl triethoxysilane is 45-55 ℃ and the treatment time is 5-10h.
6. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 3, the temperature of polyether polyol for vacuum dehydration is 110-120 ℃, and the temperature is reduced to 55-60 ℃ after vacuum dehydration.
7. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 3, polytetrahydrofuran ether glycol is polytetrahydrofuran ether glycol 2000, and the mixing of polytetrahydrofuran ether glycol and 2-hydroxyphenyl glycidyl ether is performed under the protection of nitrogen, the mixing temperature is 55-60 ℃, and the mixing time is 15-30min; the mass ratio of polytetrahydrofuran ether glycol, dicyclohexylmethane diisocyanate and 2-hydroxyphenyl glycidyl ether is 60-80:24-36:5-10.
8. The method for manufacturing the double-sided tooth synchronous belt according to claim 1, wherein in the step 3, the catalyst is an organotin catalyst, specifically dibutyltin dilaurate, and the addition amount of the catalyst is 1% -5% of the mass of polytetrahydrofuran ether glycol; the reaction temperature of the prepolymerization reaction is 85-90 ℃ and the reaction time is 2-4h.
9. The method for manufacturing the double-sided toothed synchronous belt according to claim 1, wherein in the step 4, N-dimethylformamide is added for viscosity reduction until the solid content is 60% -80%; the chain extender is 1, 4-butanediol, and the addition amount of the chain extender is 6-10% of the mass of the glycidyl ether modified polyurethane prepolymer; the addition amount of the modifier amination porous silicon scandium carbide microsphere is 8% -16% of the mass of the glycidyl ether modified polyurethane prepolymer; after adding the chain extender and the modifier, the mixture is stirred and reacted for 0.5 to 1 hour at the temperature of 85 to 90 ℃ and then is kept stand for at least 48 hours at the temperature of 75 to 95 ℃.
10. The method for manufacturing a double-sided toothed synchronous belt according to claim 1, wherein in the step 5, the temperature is raised to 100-120 ℃ in the mold, and the pressure is increased to 15-20MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311270062.XA CN117507442B (en) | 2023-09-28 | 2023-09-28 | Manufacturing method of double-sided tooth synchronous belt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311270062.XA CN117507442B (en) | 2023-09-28 | 2023-09-28 | Manufacturing method of double-sided tooth synchronous belt |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN117507442A CN117507442A (en) | 2024-02-06 |
| CN117507442B true CN117507442B (en) | 2024-06-14 |
Family
ID=89757379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311270062.XA Active CN117507442B (en) | 2023-09-28 | 2023-09-28 | Manufacturing method of double-sided tooth synchronous belt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117507442B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511921A (en) * | 2006-07-28 | 2009-08-19 | 埃克阿泰克有限责任公司 | Automotive window panel having polyurethane primer |
| CN104696437A (en) * | 2015-03-18 | 2015-06-10 | 宁波伏龙同步带有限公司 | High-temperature-resistant synchronous belt and preparation method thereof |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1325246C (en) * | 2003-10-31 | 2007-07-11 | 杭州悍马轮胎科技有限公司 | Green tyre in composite structure between wheel track of polyurethane and tyre core of rubber, and fabricating method |
| JP2007291196A (en) * | 2006-04-24 | 2007-11-08 | Matsushita Electric Ind Co Ltd | Composite material and optical part using the same |
| US9803296B2 (en) * | 2014-02-18 | 2017-10-31 | Advanced Ceramic Fibers, Llc | Metal carbide fibers and methods for their manufacture |
| DE102011054978A1 (en) * | 2011-11-02 | 2013-05-02 | Contitech Antriebssysteme Gmbh | Belt with a tension member, in particular a carbon tensile member prepared with a cross-linked polyurethane, and a preparation method |
| US10514083B2 (en) * | 2016-08-16 | 2019-12-24 | Contitech Antriebssysteme Gmbh | Cross-linked elastomeric low friction faced synchronous power transmission belt |
| CN107353448B (en) * | 2017-07-20 | 2018-10-16 | 中国热带农业科学院农产品加工研究所 | A kind of natural rubber/modified white carbon black composite material and preparation method |
| CN110452539A (en) * | 2019-08-02 | 2019-11-15 | 宁波伏龙同步带有限公司 | A kind of Polystyrene silicon rubber synchronous belt and preparation method thereof |
-
2023
- 2023-09-28 CN CN202311270062.XA patent/CN117507442B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101511921A (en) * | 2006-07-28 | 2009-08-19 | 埃克阿泰克有限责任公司 | Automotive window panel having polyurethane primer |
| CN104696437A (en) * | 2015-03-18 | 2015-06-10 | 宁波伏龙同步带有限公司 | High-temperature-resistant synchronous belt and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117507442A (en) | 2024-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110511344B (en) | Self-repairing polyurethane elastomer based on multiple dynamic reversible effects and preparation method thereof | |
| CN1400231A (en) | Polyol and the production process of polymer dispersed polyol | |
| WO2021103376A1 (en) | Non-ionic waterborne polyurethane, preparation method therefor and application thereof | |
| CN114196365B (en) | High-hardness high-cohesiveness heat-conducting polyurethane structural adhesive and preparation method thereof | |
| CN111499833B (en) | Polyurethane type self-repairing resin | |
| CN110790890A (en) | Polyurethane elastomer for metal composite sandwich plate core material and use method thereof | |
| CN111393611B (en) | Silane end-capped resin for sealant and preparation method thereof | |
| CN111925642A (en) | Preparation method of self-repairing carbon nanotube-cation waterborne polyurethane electromagnetic shielding composite material | |
| CN117507442B (en) | Manufacturing method of double-sided tooth synchronous belt | |
| CN116444977B (en) | Polyurethane elastomer and method for preparing polishing abrasive block by using same | |
| CN111154070B (en) | Fluorine-containing polyurethane and preparation method thereof | |
| CN114907541B (en) | Self-repairing polyurethane material, double-layer self-repairing polyurethane film, and preparation method and application thereof | |
| CN115558296A (en) | High-temperature-resistant high-strength silicone rubber composition and preparation method thereof | |
| CN115284165A (en) | Porous polyurethane polishing pad and preparation method thereof | |
| CN114574161A (en) | Friction material for brake pad | |
| CN111187508B (en) | Preparation method of heat-resistant polyurethane elastomer | |
| CN103665314A (en) | Casting polyurethane elastomer and preparation method thereof | |
| CN109518466B (en) | Optical cable reinforced core and preparation method thereof | |
| CN109096460B (en) | Polyurethane elastomer for manufacturing foamed shoe material and preparation method thereof | |
| CN112266603A (en) | Manufacturing method of composition for load-bearing forklift tires | |
| CN117264169A (en) | Polyurethane composite elastomer and preparation method thereof | |
| CN113831492B (en) | Preparation method of polyurethane elastomer for steel rail energy consumption piece, polyurethane elastomer and energy consumption piece | |
| CN117683197B (en) | High-temperature-resistant flame-retardant polyurethane material for roller outer ring and preparation method thereof | |
| CN111892807B (en) | Water-based composite resin impregnating agent for loudspeaker damper and preparation method thereof | |
| CN113621121B (en) | Polyurethane composition, preparation method and application of polyurethane material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |