CN114957965A - High-heat-resistance polyurethane composition, polyurethane disc and preparation method thereof - Google Patents
High-heat-resistance polyurethane composition, polyurethane disc and preparation method thereof Download PDFInfo
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- CN114957965A CN114957965A CN202210795033.4A CN202210795033A CN114957965A CN 114957965 A CN114957965 A CN 114957965A CN 202210795033 A CN202210795033 A CN 202210795033A CN 114957965 A CN114957965 A CN 114957965A
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- 229920002635 polyurethane Polymers 0.000 title claims abstract description 84
- 239000004814 polyurethane Substances 0.000 title claims abstract description 84
- 239000000203 mixture Substances 0.000 title claims abstract description 32
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229920001730 Moisture cure polyurethane Polymers 0.000 claims abstract description 59
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical class O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 49
- 239000000945 filler Substances 0.000 claims abstract description 43
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 30
- 238000010438 heat treatment Methods 0.000 claims abstract description 28
- 239000000853 adhesive Substances 0.000 claims abstract description 14
- 230000001070 adhesive effect Effects 0.000 claims abstract description 14
- 238000004140 cleaning Methods 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 9
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 238000004073 vulcanization Methods 0.000 claims abstract description 6
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 239000004970 Chain extender Substances 0.000 claims description 4
- 125000004427 diamine group Chemical group 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 6
- 238000010422 painting Methods 0.000 abstract 1
- 238000000227 grinding Methods 0.000 description 20
- IBOFVQJTBBUKMU-UHFFFAOYSA-N 4,4'-methylene-bis-(2-chloroaniline) Chemical group C1=C(Cl)C(N)=CC=C1CC1=CC=C(N)C(Cl)=C1 IBOFVQJTBBUKMU-UHFFFAOYSA-N 0.000 description 12
- 241001112258 Moca Species 0.000 description 11
- XSTXAVWGXDQKEL-UHFFFAOYSA-N Trichloroethylene Chemical group ClC=C(Cl)Cl XSTXAVWGXDQKEL-UHFFFAOYSA-N 0.000 description 8
- UBOXGVDOUJQMTN-UHFFFAOYSA-N trichloroethylene Natural products ClCC(Cl)Cl UBOXGVDOUJQMTN-UHFFFAOYSA-N 0.000 description 8
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 239000007769 metal material Substances 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 239000000377 silicon dioxide Substances 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000005488 sandblasting Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- YMWUJEATGCHHMB-UHFFFAOYSA-N Dichloromethane Chemical compound ClCCl YMWUJEATGCHHMB-UHFFFAOYSA-N 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- WKEDZWZMALHQCE-UHFFFAOYSA-N 2,4-diamino-5-methylbenzenethiol Chemical compound CC1=CC(S)=C(N)C=C1N WKEDZWZMALHQCE-UHFFFAOYSA-N 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 150000004985 diamines Chemical group 0.000 description 2
- 229910052755 nonmetal Inorganic materials 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- RMOCOTTZIBBSEK-UHFFFAOYSA-N NC=1C(=C(C(SC)(C)C)C=CC1)N Chemical compound NC=1C(=C(C(SC)(C)C)C=CC1)N RMOCOTTZIBBSEK-UHFFFAOYSA-N 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011133 lead Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000001151 other effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920003225 polyurethane elastomer Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 description 1
- 235000019982 sodium hexametaphosphate Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K9/00—Use of pretreated ingredients
- C08K9/04—Ingredients treated with organic substances
- C08K9/06—Ingredients treated with organic substances with silicon-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/08—Processes
- C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/346—Clay
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Abstract
The application discloses a high-heat-resistance polyurethane composition, which comprises NCO-terminated polyurethane prepolymer, modified silica filler and curing agent; the high heat-resistant polyurethane disc is prepared from a framework and a high heat-resistant polyurethane composition coated on the surface of the framework; the preparation method of the high heat-resistant polyurethane disc comprises the following steps: cleaning the framework, painting an adhesive, drying and placing in a mold; heating the NCO-terminated polyurethane prepolymer, then adding a curing agent and a modified silica filler, uniformly mixing, and pouring to the surface of the framework for molding; and carrying out post-vulcanization treatment on the molded polyurethane disc to obtain the high-heat-resistance polyurethane disc. The polyurethane disc has the effects of wear resistance and good heat resistance.
Description
Technical Field
The application relates to the field of grinding materials, in particular to a high-heat-resistance polyurethane composition, a polyurethane disc and a preparation method thereof.
Background
The grinding equipment is important equipment for grinding metal ores and non-metal ores, and the stirring device of the grinding equipment has various structural forms. Grinding media with a certain proportion are required to be added in the operation process of the grinding equipment, the common grinding media comprise steel balls, ceramic balls and the like, under the stirring action of the stirring mechanism, the grinding media do violent centrifugal motion in the cylinder body and have strong or weak axial staggered motion, radial collision and extrusion, tangential friction and other effects are generated on the inner wall of the cylinder body, and then materials in the cylinder body are ground.
The grinding medium in the grinding device is usually carried by a grinding disc, and the current grinding disc can be made of metal materials such as pig iron, soft copper, red copper, brass, lead and the like, and can also be made of a mixture of metal materials and non-metal materials. However, since the metallic material is easily rusted to affect the use of the grinding disc, researchers have tried to manufacture the grinding disc using high-hardness and wear-resistant polymers, such as polyurethane discs made of polyurethane materials.
The polyurethane disc has high hardness, high wear resistance and chemical resistance, so that the polyurethane material has a good application prospect in the grinding field, but the polyurethane disc prepared from the polyurethane material has poor heat resistance, a large amount of heat can be generated between grinding media in grinding equipment and when the grinding media are contacted with a material to be ground, and the polyurethane disc deforms under a high-temperature condition to influence the use of the polyurethane disc.
Disclosure of Invention
In order to solve the problem of poor heat resistance of the polyurethane disc, the application provides a high heat-resistant polyurethane composition with wear resistance and good heat resistance, a polyurethane disc and a preparation method thereof.
In a first aspect, the application provides a high heat-resistant polyurethane composition, which comprises an NCO-terminated polyurethane prepolymer, a modified silica filler and a curing agent.
By adopting the technical scheme, the modified silica filler has good heat resistance, and the problem of poor heat resistance of the polyurethane composition can be solved.
Optionally, the amount of the modified silica filler is 5wt% -30wt% of the NCO-terminated polyurethane prepolymer.
By adopting the technical scheme, the proportion of the modified silica filler and the NCO-terminated polyurethane prepolymer is controlled, the modified silica filler has good dispersion effect in the prepolymer, the density, the strength and the tensile property of the polyurethane composition can be improved, the bonding force between the lamellar structure of the modified silica filler and the prepolymer is good, the compatibility is good, when a product is subjected to external force, the filler and the prepolymer are not easy to separate, the generated stress is dispersed, so that cracks are avoided, and the effects of toughening, strengthening and improving the wear resistance and the heat resistance are achieved.
Optionally, the curing agent is selected from diamine type chain extenders.
Optionally, the amount of the curing agent is 8-25 wt% of the NCO-terminated polyurethane prepolymer.
By adopting the technical scheme, the reaction ratio of the end NCO-based polyurethane prepolymer and the curing agent is controlled, the requirement for increasing a molecular chain can be met, and the reaction point of a branched chain can be led out from the generated molecular chain, so that the prepolymer is accelerated to generate crosslinking and form a net-shaped structure, the curing effect is ensured on the basis of shortening the gel and curing time, and the probability of self-polymerization of the end NCO-based polyurethane prepolymer can be improved due to the shortened curing time.
Optionally, in the NCO-terminated polyurethane prepolymer, the NCO content is 4% -10%.
Optionally, in the NCO-terminated polyurethane prepolymer, the NCO content is 5% -7%.
By adopting the technical scheme, the NCO content in the end-NCO-group polyurethane prepolymer is controlled in a lower range, the viscosity is lower, the property of the end-NCO-group polyurethane prepolymer is stable, the tendency of side reaction is small, the probability of chain extension reaction of the end-NCO-group polyurethane prepolymer is reduced, and the obtained polyurethane composition is uniform and stable.
In a second aspect, the present application provides a high heat-resistant polyurethane disc, which is made of a skeleton and a high heat-resistant polyurethane composition coated on the surface of the skeleton.
In a third aspect, the present application provides a method for preparing a high heat-resistant polyurethane disc, comprising the following steps:
(1) cleaning the framework, coating an adhesive, drying and placing in a mold;
(2) heating the NCO-terminated polyurethane prepolymer, then adding a curing agent and a modified silica filler, uniformly mixing, and pouring to the surface of the framework for molding;
(3) and carrying out post-vulcanization treatment on the molded polyurethane disc to obtain the high-heat-resistance polyurethane disc.
Optionally, in the step (2), heating the NCO-terminated polyurethane prepolymer, and then performing primary defoaming treatment, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process.
Optionally, in the step (2), after the NCO-terminated polyurethane prepolymer, the curing agent and the modified silica filler are mixed, secondary defoaming treatment is performed, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process.
By adopting the technical scheme, after primary defoaming treatment, the polyurethane has few bubbles, the dispersion of the modified silica filler cannot be hindered, and the dispersion effect of the modified silica filler is good; the bubbles in the polyurethane composition obtained after the secondary defoaming treatment are eliminated, uneven bulges can not be left on the surface of the polyurethane disc, the service life of the polyurethane disc is maintained, and the elasticity, the strength, the elongation and the wear resistance of the polyurethane disc are improved.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the modified silica filler is added into the end NCO-based polyurethane prepolymer, and the modified silica filler has good dispersibility in the end NCO-based polyurethane prepolymer and good bonding force with a base body of the end NCO-based polyurethane prepolymer, so that the cross-linking of the end NCO-based polyurethane prepolymer and a curing agent can be promoted, a compact reticular structure is formed, the curing time is shortened, the problem of self-polymerization of the end NCO-based polyurethane prepolymer caused by the curing time is solved, and the prepared polyurethane composition is uniform and stable;
2. after the silica filler is modified, when the polyurethane composition is coated on the surface of the framework, the modified silica filler can improve the adhesive force between the polyurethane composition and the metal framework, so that the polyurethane composition is tightly coated on the surface of the framework, and the wear resistance and the heat resistance of the polyurethane disk are reduced without generating bubbles and the like.
Detailed Description
The present application will be described in further detail with reference to specific examples.
The high-heat-resistance polyurethane composition comprises an NCO-terminated polyurethane prepolymer, a modified silica filler and a curing agent.
In the invention, the NCO-based polyurethane prepolymer is selected from cast polyurethane elastomer (CPU) containing end NCO group, compared with TPU and MPU, the NCO-based polyurethane prepolymer is directly formed after casting and curing reaction, the processing technology is simple, the selection range of raw materials is wider, and the hardness of the product is larger.
In the invention, the NCO content in the NCO-terminated polyurethane prepolymer is 4-10%, specifically 4%, 5%, 6%, 7%, 8%, 9%, 10%; more preferably, the NCO content of the NCO-terminated polyurethane prepolymer is 5-7%.
In the present invention, the curing agent is selected from diamine type chain extenders.
Wherein the diamine chain extender is selected from 3,3 '-dichloro-4, 4' -diaminodiphenylmethane (MOCA), diaminodimethylmethylthiotoluene (DADMT) and 2, 4-diamino-5-mercaptotoluene (TX-1); when different curing agents are selected, the reaction temperature of the curing agent and the polyurethane prepolymer is adjusted, for example, when MOCA is adopted, the mixing temperature is 100-120 ℃, and when TX-1 is adopted, the mixing temperature is 20-40 ℃. MOCA is selected in this application.
In the invention, the dosage of the curing agent is 8wt% -25wt% of the NCO-terminated polyurethane prepolymer, specifically 8wt%, 10 wt%, 15 wt%, 18 wt%, 20 wt%, 25 wt%; more preferably, the curing agent is used in an amount of 15 to 20 wt% based on the weight of the NCO-terminated polyurethane prepolymer.
In the invention, the amount of the modified silica filler is 5wt% -30wt% of the NCO-terminated polyurethane prepolymer, specifically 5wt%, 10 wt%, 15 wt%, 18 wt%, 20 wt%, 25wt%, 30 wt%; more preferably, the modified silica filler is used in an amount of 15 to 20 wt% based on the weight of the NCO-terminated polyurethane prepolymer.
The application also provides a high heat-resistant polyurethane disc which is prepared from the framework and the high heat-resistant polyurethane composition coated on the surface of the framework.
The application provides a high heat-resistant polyurethane disc, and a preparation method thereof comprises the following steps:
(1) cleaning the framework, coating an adhesive, drying and placing in a mold;
(2) heating the NCO-terminated polyurethane prepolymer, then adding a curing agent and a modified silica filler, uniformly mixing, and pouring to the surface of the framework for molding;
(3) and carrying out post-vulcanization treatment on the molded polyurethane disc to obtain the high-heat-resistance polyurethane disc.
In the invention, the framework in the step (1) is made of metal materials, the framework is prefabricated according to the size of a required polyurethane disc, and then the framework is subjected to sand blasting or shot blasting treatment to remove oil stains and rust stains on the surface, and meanwhile, the specific surface area of the metal surface can be increased, thereby being beneficial to the subsequent adhesion of polyurethane and metal.
In the invention, trichloroethylene is adopted in the cleaning step in the step (1); the adhesive is selected from the group consisting of chemlock218 adhesives; after the adhesive is coated, the adhesive is naturally dried, and then the adhesive is placed in an oven at the temperature of 110-120 ℃ for heating for 1-2 hours, which is beneficial to the bonding of the adhesive.
In the invention, the mould is cleaned by trichloroethylene or dichloromethane, the release agent is coated or sprayed, and then the mould is heated for standby at the temperature of 110-120 ℃, and the preheated mould is beneficial to the subsequent polyurethane molding.
In the invention, in the step (2), the heating temperature of the NCO-terminated polyurethane prepolymer is 80-85 ℃, and the NCO-terminated polyurethane prepolymer can be mixed with a curing agent after being heated to be molten; when the curing agent is MOCA, the curing agent is also heated at the temperature of 115 ℃ and 120 ℃ until being melted, and then the curing agent can be mixed with the NCO-terminated polyurethane prepolymer.
In the invention, in the step (2), the NCO-terminated polyurethane prepolymer is heated and melted and then placed in a vacuum defoaming tank for primary defoaming treatment, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process.
In the invention, in the step (2), the NCO-terminated polyurethane prepolymer, the curing agent and the modified silica filler are mixed and then placed in a vacuum defoaming tank for secondary defoaming treatment, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process; when the surface has no bubbles, slowly pouring into the mold, and if there are still a few bubbles on the surface of the adhesive layer, eliminating the bubbles by using a flame spray gun.
In the invention, the time for casting molding in the step (2) is 5-15min, and demolding can be carried out after molding.
In the invention, the post-vulcanization treatment step in the step (3) is specifically as follows: the polyurethane disc after molding and demolding is heated at the temperature of 100-120 ℃ for 8-15 hours, and the polyurethane composition after post-vulcanization treatment is further crosslinked, so that the mechanical properties of the polyurethane disc, such as hardness, tensile strength, tear strength and the like, can be improved.
Preparation example
A modified silica filler is prepared by the following steps:
s1, coarse crushing of raw ore: crushing, coarsely grinding and screening a silica raw material to obtain silica powder;
s2, preparing water slurry: dispersing silica powder and sodium hexametaphosphate in water, and stirring and finely grinding to obtain silica slurry;
s4, drying the water slurry: drying the silica slurry to obtain dry powder;
s5, preparing a finished product: dispersing the dried powder, adding KH560 for spray modification, controlling the modification temperature at 85-120 ℃, and keeping the temperature for 10-30min under the original modification temperature after spray modification to obtain the modified silica filler.
In the preparation example, the dosage of KH560 is 0.5 percent of the dry powder.
The particle size of the modified silica filler D90 is 5 μm.
Example 1
A high heat-resistant polyurethane disc is prepared by the following steps:
(1) carrying out sand blasting treatment on the framework, cleaning the framework by using trichloroethylene, coating an adhesive chemlock218 on the surface of the framework, airing the framework, and then heating the framework in a drying oven at 110-120 ℃ for 1.5 hours;
cleaning the mold with trichloroethylene, coating a release agent, and placing the mold on a heating platform at the temperature of 110-120 ℃ for heating for 1.5 hours;
placing the preheated framework in a preheated mould, and then placing the preheated framework and the mould together on a heating platform at the temperature of 110-;
(2) heating and melting an NCO-terminated polyurethane prepolymer (NCO content is 4%) at the temperature of 80-85 ℃;
heating and melting MOCA at the temperature of 115-120 ℃;
taking 100 parts by weight of melted NCO-terminated polyurethane prepolymer, 0.05 part by weight of modified silica filler prepared in the preparation example and 0.08 part by weight of melted MOCA, uniformly mixing, pouring into a mold and coating the mold on the surface of a framework, standing for 8min at the temperature of 110-120 ℃, and demolding;
(3) and heating the molded and demoulded polyurethane disc at 100-120 ℃ for 8 hours to obtain the high-heat-resistance polyurethane disc.
Example 2
A high heat-resistant polyurethane disc is prepared by the following steps:
(1) carrying out sand blasting treatment on the framework, cleaning the framework by using trichloroethylene, coating an adhesive chemlock218 on the surface of the framework, airing the framework, and then heating the framework in a drying oven at 110-120 ℃ for 1.5 hours;
cleaning the mold with trichloroethylene, coating a release agent, and placing the mold on a heating platform at the temperature of 110-120 ℃ for heating for 1.5 hours;
placing the preheated framework in a preheated mould, and then placing the preheated framework and the mould together on a heating platform at the temperature of 110-;
(2) heating and melting an NCO-terminated polyurethane prepolymer (NCO content is 4%) at the temperature of 80-85 ℃; weighing 100 parts by weight of NCO-terminated polyurethane prepolymer, and carrying out primary defoaming in a vacuum defoaming tank, wherein the vacuum degree is 0.1 MPa;
heating and melting MOCA at the temperature of 115-120 ℃;
taking the foamed NCO-terminated polyurethane prepolymer, 0.05 part by weight of the modified silica filler prepared in the preparation example and 0.08 part by weight of melted MOCA, uniformly mixing, pouring into a mold and coating the mold on the surface of a framework, standing for 8min at the temperature of 110-;
(3) and heating the molded and demoulded polyurethane disc at 100-120 ℃ for 8 hours to obtain the high-heat-resistance polyurethane disc.
Example 3
A high heat-resistant polyurethane disc is prepared by the following steps:
(1) carrying out sand blasting treatment on the framework, cleaning the framework by using trichloroethylene, coating an adhesive chemlock218 on the surface of the framework, airing the framework, and then heating the framework in a drying oven at 110-120 ℃ for 1.5 hours;
cleaning the mold with trichloroethylene, coating a release agent, and placing the mold on a heating platform at the temperature of 110-120 ℃ for heating for 1.5 hours;
placing the preheated framework in a preheated mould, and then placing the preheated framework and the mould together on a heating platform at the temperature of 110-;
(2) heating and melting an NCO-terminated polyurethane prepolymer (NCO content is 4%) at the temperature of 80-85 ℃; weighing 100 parts by weight of NCO-terminated polyurethane prepolymer, and carrying out primary defoaming in a vacuum defoaming tank, wherein the vacuum degree is 0.1 MPa;
heating and melting MOCA at the temperature of 115-120 ℃;
uniformly mixing a foamed NCO-terminated polyurethane prepolymer, 0.05 part by weight of modified silica filler prepared in the preparation example and 0.08 part by weight of molten MOCA, placing the mixture in a vacuum defoaming tank for secondary defoaming with the vacuum degree of 0.1MPa, pouring the mixture into a mold when the surface basically has no large amount of bubbles and coating the mixture on the surface of a framework, standing the mixture for 8min at the temperature of 110-120 ℃, and demolding;
(3) and heating the molded and demoulded polyurethane disc at 100-120 ℃ for 8 hours to obtain the high-heat-resistance polyurethane disc.
Examples 4 to 8
The difference from example 3 is that the amounts of the raw materials are different, as shown in the following table.
TABLE 1
| Item | NCO group terminated polyurethane prepolymer/part | Modified silica Filler/portion | MOCA/portion |
| Example 3 | 100 | 0.05 | 0.08 |
| Example 4 | 100 | 0.1 | 0.08 |
| Example 5 | 100 | 0.1 | 0.15 |
| Example 6 | 100 | 0.2 | 0.15 |
| Example 7 | 100 | 0.2 | 0.25 |
| Example 8 | 100 | 0.3 | 0.25 |
Example 9
The difference from example 6 is that the NCO content of the NCO-terminated polyurethane prepolymer was 5%.
Example 10
The difference from example 6 is that the NCO content of the NCO-terminated polyurethane prepolymer was 7%.
Example 11
The difference from example 6 is that the NCO content of the NCO-terminated polyurethane prepolymer was 10%.
Example 12
The difference from example 6 is that the NCO content of the NCO-terminated polyurethane prepolymer was 15%.
Example 13
The difference from example 6 is that the NCO content of the NCO-terminated polyurethane prepolymer was 0.8%.
Comparative example 1
The difference from example 1 is that the high heat resistant polyurethane composition does not have a modified silica filler added.
Comparative example 2
The difference from example 1 is that the modified silica filler was replaced by an equal mass of calcium carbonate filler having a particle size D90 of 5 μm.
Comparative example 3
The difference from example 1 is that the modified silica filler was replaced by an equal mass of silica sand filler and the particle size D90 of the calcium carbonate filler was 5 μm.
Test results
1. The polyurethane disks of examples 1 to 13 and comparative examples 1 to 3 were subjected to abrasion resistance tests using a DIN abrasion tester according to the test standard DIN53516 GB9867, the test results being filled in the table below;
2. the polyurethane plate is placed in an aging box at 150 ℃ for storage, taken out during testing, immediately moved into a high-temperature chamber at 150 ℃, stabilized for 30 minutes, subjected to a high-temperature tensile test, and the test results are filled in the following table.
TABLE 2
From the data in Table 2, it can be seen that the polyurethane disks produced according to the invention have a DIN abrasion of 30mm 3 Above, the initial tensile strength is above 35MPa, and the high temperature resistance is good.
According to the comparison between the comparative examples 1 to 3 and the example 1, the modified silica filler has good dispersibility in polyurethane and good bonding force with a polyurethane matrix, can effectively improve the wear resistance and tensile strength of a polyurethane disc, has better tensile strength under the condition of high temperature (150 ℃) and still has better tensile strength after being aged for 30 days at high temperature compared with other fillers such as calcium carbonate filler, quartz sand filler and the like.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The high heat-resistant polyurethane composition is characterized by comprising an NCO-terminated polyurethane prepolymer, a modified silica filler and a curing agent.
2. A highly heat resistant polyurethane composition as claimed in claim 1, characterized in that: the dosage of the modified silica filler is 5wt% -30wt% of the NCO-terminated polyurethane prepolymer.
3. A highly heat resistant polyurethane composition as claimed in claim 1, characterized in that: the dosage of the curing agent is 8wt% -25wt% of the NCO-terminated polyurethane prepolymer.
4. A highly heat resistant polyurethane composition as claimed in claim 1, characterized in that: the curing agent is selected from diamine chain extenders.
5. A highly heat resistant polyurethane composition as claimed in claim 1, characterized in that: in the NCO-terminated polyurethane prepolymer, the NCO content is 4% -10%.
6. A highly heat resistant polyurethane composition as claimed in claim 4, characterized in that: in the NCO-terminated polyurethane prepolymer, the NCO content is 5-7%.
7. The high heat-resistant polyurethane disc is characterized by being prepared from a framework and a high heat-resistant polyurethane composition coated on the surface of the framework.
8. A preparation method of a high heat-resistant polyurethane disc is characterized by comprising the following steps:
(1) cleaning the framework, coating an adhesive, drying and placing in a mold;
(2) heating the NCO-terminated polyurethane prepolymer, then adding a curing agent and a modified silica filler, uniformly mixing, and pouring to the surface of the framework for molding;
(3) and carrying out post-vulcanization treatment on the molded polyurethane disc to obtain the high-heat-resistance polyurethane disc.
9. The method for preparing a high heat-resistant polyurethane disk according to claim 8, wherein: in the step (2), the NCO-terminated polyurethane prepolymer is heated and then subjected to primary defoaming treatment, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process.
10. The method for preparing a high heat-resistant polyurethane disk according to claim 9, wherein: in the step (2), the NCO-terminated polyurethane prepolymer, the curing agent and the modified silica filler are mixed and then subjected to secondary defoaming treatment, wherein the vacuum degree is 0.05-0.5MPa in the defoaming process.
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