CN110964433A - Spraying type castor oil-based polyurethane damping material and preparation method thereof - Google Patents
Spraying type castor oil-based polyurethane damping material and preparation method thereof Download PDFInfo
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
- C09D175/14—Polyurethanes having carbon-to-carbon unsaturated bonds
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- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/30—Low-molecular-weight compounds
- C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
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- C08G18/3206—Polyhydroxy compounds aliphatic
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
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- C08G18/40—High-molecular-weight compounds
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- C08G18/6666—Compounds of group C08G18/48 or C08G18/52
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- C09D7/63—Additives non-macromolecular organic
Abstract
The invention discloses a spray type castor oil-based polyurethane damping material and a preparation method thereof, relating to the technology of high polymer damping materialsThe field is that the component A and the component B are mixed according to the proportion of 1: 2-3, and polymerizing; the component A is prepared from the following raw materials in parts by mass: 700 parts of castor oil, 400 parts of polytetrahydrofuran polyalcohol, 400 parts of diisocyanate, 700 parts of micromolecular chain extender, 10-30 parts of silane coupling agent and 300 parts of plasticizer; the component B comprises the following raw materials in parts by weight: 600 parts of amino-terminated polyether, 20-50 parts of vulcanizing agent, 500 parts of plasticizer, 600 parts of inorganic filler, 1-5 parts of antioxidant and 10-30 parts of rheological additive. In the invention, the component A is a-NCO-terminated reticular high-crosslinking-degree polyurethane prepolymer and the component B is-NH2The damping coating can react quickly, the curing speed is high, the construction is convenient, the elastic modulus and the tensile strength of the obtained damping coating are good, the damping performance is excellent, and the damping factor can reach 1.1.
Description
Technical Field
The invention relates to the technical field of high polymer damping materials, in particular to a spraying type castor oil-based polyurethane damping material and a preparation method thereof.
Background
The damping material is used as an environment-friendly product and is widely applied to vibration reduction and noise reduction in the fields of vehicles, industrial machinery, building and civil engineering, household appliances, precision instruments, military equipment and the like. Viscoelasticity is an important characteristic of a polymer material, and hysteresis and mechanical loss of the polymer material under the action of an alternating force are root causes of damping action. The phase angle difference δ of strain behind stress is called the mechanical loss angle, and the magnitude of the internal loss is usually expressed by the mechanical loss tangent tan δ. The mechanical loss and the damping performance are closely related, and the larger the internal loss of the polymer is, the better the damping effect is.
The polymeric damping materials are various, and among them, the damping material with Polyurethane (PU) matrix is one of the most studied polymeric materials. The polyurethane is a block polymer consisting of soft and hard segments, has a large amount of hydrogen bonds and a certain degree of phase separation, and can obtain a damping material with wide temperature range and high loss by adjusting the structure and the proportion of the soft and hard segments. Because the structure and performance of polyurethane have strong designability, it is widely used in the fields of automobile, ship manufacturing, architectural decoration, etc. Chinese patent CN103113748B, a siloxane damping elastomer for vehicles, introduces hollow glass beads and silica powder to improve the modulus and the degree of mixing of the elastomer, reduce the density of the product and achieve the effect of weight reduction, but the strength and the damping performance of the elastomer are not good enough only by simple resin blending. Chinese patent CN109021196A "an organic silicon type polyurethane damping material and its preparation method", mainly adopts enol and methyl epoxypropane to synthesize terminal alkenyl ether alcohol, then synthesize with silicone oil of silicon dimethyl structure to obtain dihydric alcohol, and further synthesize to obtain organic silicon type polyurethane damping material, its main advantage lies in the same carbon dimethyl structure of high solid content, make the frictional resistance that produces when the chain segment moves increase, the dissipation factor of the material improves, the damping performance improves, but there is certain by-product produced in the synthetic process, the production efficiency waits to be further improved, the crosslinking degree and compatibility of polyurethane molecule are not enough at the same time, thus limit its damping performance to further improve. Therefore, the development of a polyurethane damping material with excellent damping performance is one of the important points of development, and in addition, the spraying type damping material also requires strong adhesion between a damping coating and a base material, rapid curing and convenient construction.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a spraying type castor oil-based polyurethane damping material and a preparation method thereof, and the prepared damping material has excellent damping performance and the damping coating has good elastic modulus and tensile strength.
The invention provides a spray type castor oil-based polyurethane damping material which is prepared from a component A and a component B according to the weight ratio of 1: 2-3, and polymerizing;
the component A is prepared from the following raw materials in parts by mass: 700 parts of castor oil, 400 parts of polytetrahydrofuran polyalcohol, 400 parts of diisocyanate, 700 parts of micromolecular chain extender, 10-30 parts of silane coupling agent and 300 parts of plasticizer;
the component B comprises the following raw materials in parts by weight: 600 parts of amino-terminated polyether, 20-50 parts of vulcanizing agent, 500 parts of plasticizer, 600 parts of inorganic filler, 1-5 parts of antioxidant and 10-30 parts of rheological additive.
Preferably, the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; preferably, the polytetrahydrofuran polyol has a functionality of 2 and a number average molecular weight of 1000-.
Preferably, the diisocyanate is any one or more of a mixture MDI-50 of 4,4' -diphenylmethane diisocyanate and 2, 4-diphenylmethane diisocyanate, toluene diisocyanate, isophorone diisocyanate and hexamethylene diisocyanate.
Preferably, the small molecular chain extender is any one of neopentyl glycol, trimethylolpropane, 1, 4-butanediol and dimethylolpropionic acid; preferably, the plasticizer is any one or more of dibutyl phthalate, dioctyl phthalate, triphenyl phosphate, tricresyl phosphate, chlorinated paraffin 52, long-chain paraffin and chlorinated palm oil methyl ester.
Preferably, the amino-terminated polyether has a functionality of 3 and a number average molecular weight of 1000-.
Preferably, the vulcanizing agent is a vulcanizing agent MOCA; the inorganic filler is any one or more of mica, graphite, molybdenum disulfide and boron nitride; the antioxidant is any one of antioxidant 245, antioxidant 1010, antioxidant 1035 and antioxidant 1076; the rheological additive is any one of gas-phase silicon dioxide, gas-phase titanium dioxide and gas-phase aluminum oxide.
The invention also provides a preparation method of the spray type castor oil-based polyurethane damping material, which comprises the following steps:
(1) preparation of the component A: adding castor oil and polytetrahydrofuran polyol into a reaction kettle, heating, and performing vacuum dehydration; cooling, adding part of diisocyanate, and reacting while keeping the temperature; adding a micromolecular chain extender, and carrying out heat preservation reaction; adding part of diisocyanate, and reacting at a constant temperature; adding the rest diisocyanate, cooling, dropwise adding a silane coupling agent, stirring after dropwise adding, adding a plasticizer, stirring, discharging, sealing and storing to obtain a component A;
(2) preparing a component B: adding a plasticizer, amino-terminated polyether and a vulcanizing agent into a reaction kettle, stirring, adding an inorganic filler and an antioxidant, heating while stirring, and performing vacuum dehydration; cooling, adding rheological additive, stirring, cooling, discharging, sealing and storing to obtain component B;
(3) preparing a damping material: mixing the component A and the component B in proportion, and stirring to obtain the composition.
Preferably, in the step (1), adding castor oil and polytetrahydrofuran polyol into a reaction kettle, heating to 100 ℃, and carrying out vacuum dehydration for 2 hours, wherein the vacuum degree is more than or equal to 0.08 MPa; cooling to 80 ℃, adding diisocyanate, and reacting for 1-2h under heat preservation; adding a micromolecular chain extender, and reacting for 1-2h at the temperature of 80 ℃; adding diisocyanate, and reacting for 3-4h at 80 ℃; adding the rest diisocyanate, cooling to 40-50 ℃, slowly dripping the silane coupling agent, stirring for 0.5h after dripping, adding the plasticizer, stirring for 1h, discharging, sealing and storing to obtain the component A.
Preferably, in step (1), the diisocyanate is added in three portions so that the-NCO/-OH value of the reaction system increases stepwise after each addition, being 0.1-0.5, 2-2.8, 2.8-3, respectively.
Preferably, in the step (2), the plasticizer, the amino-terminated polyether and the vulcanizing agent are added into the reaction kettle and uniformly stirred, then the inorganic filler and the antioxidant are added, the temperature is raised while stirring, the temperature is raised to 120 ℃, the vacuum dehydration is carried out for 2 hours, the vacuum degree is more than or equal to 0.08MPa, the temperature is lowered to 80 ℃, the rheological additive is added, the stirring is carried out, the temperature is lowered to 50 ℃, the material is discharged, and the component B is obtained after sealed preservation.
The construction method of the spray type castor oil-based polyurethane damping material comprises the following steps: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
The beneficial effects of the invention are shown in the following aspects:
1. in the invention, the component A is a-NCO-terminated reticular high-crosslinking-degree polyurethane prepolymer and the component B is-NH2The damping coating can react quickly, can be used after being mixed uniformly, is high in curing speed and convenient to construct, and the elastic modulus and the tensile strength of the obtained damping coating are good;
2. the castor oil contained in the component A can improve the crosslinking degree of polyurethane, obtain the polyurethane molecules with high crosslinking degree and improve the compatibility of soft and hard segments; the addition of the silane coupling agent increases the content of a hard segment, is beneficial to microphase separation, and increases the friction force when a chain segment moves, so that the damping performance and hydrolysis resistance of the damping material are greatly improved, and the damping factor can reach 1.1;
3. in the preparation process of the component A, diisocyanate is added for three times, and the-NCO/-OH is designed to be gradually increased from 0.1 to 3, so that the reaction process is controllable, the molecular weight is gradually increased, and the viscosity increase caused by over-fast reaction is avoided;
4. in the invention, the-NCO/-OH of the mixed grafting reaction of the component A and the component B is 1.1-1.3, so that the excessive NCO can be used for gelling, the component A and the component B can fully react, meanwhile, the excessive NCO can be subjected to moisture curing with moisture in the air, and if the residual NCO is too much and is more than 1.3, the reaction of the NCO and moisture can generate more bubbles, and the final damping performance is influenced;
4. the damping material prepared by the invention does not contain organic solvent, is safe and environment-friendly, and has no pollution to the environment.
Detailed Description
The technical solution of the present invention will be described in detail below with reference to specific examples.
Example 1
A spray type castor oil-based polyurethane damping material is prepared from a component A and a component B according to the weight ratio of 1:2 by mass ratio;
the component A is prepared from the following raw materials in parts by mass: 500 parts of castor oil, 2000300 parts of polytetrahydrofuran dihydric alcohol, 470 parts of toluene diisocyanate, MDI-5020 parts of p-phenyl diisocyanate, 20 parts of dimethylolpropionic acid, 15 parts of gamma-aminopropyltriethoxysilane and 300 parts of dibutyl phthalate; wherein the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; polytetrahydrofuran diol 2000 has a functionality of 2;
the component B comprises the following raw materials in parts by weight: 2000450 parts of amino-terminated polyether, 25 parts of vulcanizing agent MOCA, 360 parts of dioctyl phthalate, 200 parts of mica, 10102 parts of antioxidant and 15 parts of fumed silica; wherein the amino-terminated polyether has a functionality of 3.
Preparing a spraying type castor oil-based polyurethane damping material:
(1) preparation of the component A: adding castor oil and polytetrahydrofuran diol 2000 into a reaction kettle, heating to 100 ℃, and dehydrating in vacuum for 2 hours with the vacuum degree of more than 0.08 MPa; cooling to 85 ℃, adding 20 parts of toluene diisocyanate, and reacting for 1.5 hours in a heat preservation manner; adding dimethylolpropionic acid, and reacting for 1.5h at the temperature of 85 ℃; slowly adding 450 parts of toluene diisocyanate, and reacting for 3.5 hours at the temperature of 80 ℃; slowly adding MDI-5020 parts of p-phenyl diisocyanate, cooling to 45 ℃, slowly adding gamma-aminopropyltriethoxysilane dropwise, stirring for 0.5h after dropwise addition is finished, adding dibutyl phthalate serving as a plasticizer, stirring for 1h, discharging, packaging, sealing and storing to obtain a component A;
(2) preparing a component B: adding plasticizer dioctyl phthalate, amino-terminated polyether 2000 and vulcanizing agent MOCA into a reaction kettle, uniformly stirring, then sequentially and slowly adding inorganic filler mica and antioxidant 1010, heating while stirring, heating to 120 ℃, vacuum dehydrating for 2 hours, wherein the vacuum degree is more than 0.08MPa, cooling to 65 ℃, adding fumed silica, uniformly stirring, cooling to 50 ℃, discharging, packaging, sealing and storing to obtain component B;
(3) preparing a damping material: mixing the component A and the component B according to the mass ratio of 1:2, and stirring to obtain the composition.
Construction and spraying: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
Example 2
A spray type castor oil-based polyurethane damping material is prepared from a component A and a component B according to the weight ratio of 1:2 by mass ratio;
the component A is prepared from the following raw materials in parts by mass: 600 parts of castor oil, 2000200 parts of polytetrahydrofuran dihydric alcohol, MDI-50500 parts of p-phenyl diisocyanate, 80 parts of toluene diisocyanate, 15 parts of dimethylolpropionic acid, 20 parts of gamma-aminopropyltriethoxysilane and 200 parts of methyl chloropalmitolate; wherein the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; polytetrahydrofuran diol 2000 has a functionality of 2;
the component B comprises the following raw materials in parts by weight: 3000500 parts of amino-terminated polyether, 15 parts of vulcanizing agent MOCA, 52200 parts of chlorinated paraffin, 200 parts of graphite, 10102 parts of antioxidant and 15 parts of fumed silica; wherein the amino-terminated polyether has a functionality of 3.
Preparing a spraying type castor oil-based polyurethane damping material:
(1) preparation of the component A: adding castor oil and polytetrahydrofuran diol 2000 into a reaction kettle, heating to 100 ℃, and dehydrating in vacuum for 2 hours with the vacuum degree of more than 0.08 MPa; cooling to 85 ℃, adding 30 parts of toluene diisocyanate, and reacting for 1.5 hours in a heat preservation manner; adding dimethylolpropionic acid, and reacting for 1.5h at the temperature of 85 ℃; slowly adding MDI-50500 parts of p-phenyl diisocyanate, and reacting for 3.5 hours at the temperature of 80 ℃; slowly adding 50 parts of toluene diisocyanate, starting cooling, reducing the temperature to 45 ℃, slowly dropwise adding gamma-aminopropyltriethoxysilane, stirring for 0.5h after dropwise adding, adding a plasticizer of chlorinated palm oil methyl ester, stirring for 1h, discharging, packaging, sealing and storing to obtain a component A;
(2) preparing a component B: adding plasticizer chlorinated paraffin 52, amino-terminated polyether 3000 and vulcanizing agent MOCA into a reaction kettle, uniformly stirring, then sequentially and slowly adding inorganic filler graphite and antioxidant 1010, heating while stirring, heating to 120 ℃, performing vacuum dehydration for 2 hours, wherein the vacuum degree is more than 0.08MPa, cooling to 65 ℃, adding fumed silica, uniformly stirring, cooling to 50 ℃, discharging, packaging, sealing and storing to obtain component B;
(3) preparing a damping material: mixing the component A and the component B according to the mass ratio of 1:2, and stirring to obtain the composition.
Construction and spraying: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
Example 3
A spray type castor oil-based polyurethane damping material is prepared from a component A and a component B according to the weight ratio of 1:3 in a mass ratio;
the component A is prepared from the following raw materials in parts by mass: 650 parts of castor oil, 3000200 parts of polytetrahydrofuran diol, 600 parts of toluene diisocyanate, 100 parts of isophorone diisocyanate, 30 parts of neopentyl glycol, 15 parts of gamma-aminopropyltriethoxysilane and 200 parts of triphenyl phosphate; wherein the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; polytetrahydrofuran diol 3000 has a functionality of 2;
the component B comprises the following raw materials in parts by weight: 1000100 parts of amino-terminated polyether, 3000300 parts of amino-terminated polyether, 20 parts of vulcanizing agent MOCA, 250 parts of dibutyl phthalate, 300 parts of mica, 10352 parts of antioxidant and 20 parts of fumed silica; wherein the amino-terminated polyether has a functionality of 3.
Preparing a spraying type castor oil-based polyurethane damping material:
(1) preparation of the component A: adding the castor oil and the polytetrahydrofuran diol 3000 into a reaction kettle, heating to 100 ℃, and dehydrating in vacuum for 2 hours with the vacuum degree of more than 0.08 MPa; cooling to 85 ℃, adding 40 parts of isophorone diisocyanate, and reacting for 1.5 hours in a heat preservation manner; adding neopentyl glycol, and reacting for 1.5h at the temperature of 85 ℃; slowly adding 600 parts of toluene diisocyanate, and reacting for 3.5 hours at the temperature of 80 ℃; slowly adding 60 parts of isophorone diisocyanate, starting cooling, reducing the temperature to 45 ℃, slowly dropwise adding gamma-aminopropyl triethoxysilane, stirring for 0.5h after dropwise adding is finished, adding a plasticizer triphenyl phosphate, stirring for 1h, discharging, packaging, sealing and storing to obtain a component A;
(2) preparing a component B: adding plasticizer dibutyl phthalate, amino-terminated polyether 1000, amino-terminated polyether 3000 and vulcanizing agent MOCA into a reaction kettle, uniformly stirring, then sequentially and slowly adding inorganic filler mica and antioxidant 1035, heating while stirring, heating to 120 ℃, vacuum dehydrating for 2 hours, keeping the vacuum degree above 0.08MPa, cooling to 65 ℃, adding fumed silica, uniformly stirring, cooling to 50 ℃, discharging, packaging, sealing and storing to obtain component B;
(3) preparing a damping material: mixing the component A and the component B according to the mass ratio of 1:3, and stirring to obtain the composition.
Construction and spraying: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
Example 4
A spray type castor oil-based polyurethane damping material is prepared from a component A and a component B according to the weight ratio of 1:2 by mass ratio;
the component A is prepared from the following raw materials in parts by mass: 700 parts of castor oil, 3000100 parts of polytetrahydrofuran dihydric alcohol, 5000100 parts of polytetrahydrofuran dihydric alcohol, 430 parts of diisocyanate, 10 parts of 1, 4-butanediol, 20 parts of gamma-aminopropyltriethoxysilane and 100 parts of triphenyl phosphate; wherein the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; the functionality of polytetrahydrofuran diol 3000 and polytetrahydrofuran diol 5000 is 2;
the component B comprises the following raw materials in parts by weight: 1000200 parts of amino-terminated polyether, 20 parts of vulcanizing agent MOCA, 500 parts of dibutyl phthalate, 300 parts of mica, 100 parts of molybdenum disulfide, 2451 parts of antioxidant and 30 parts of gas-phase titanium dioxide; wherein the amino-terminated polyether has a functionality of 3.
Preparing a spraying type castor oil-based polyurethane damping material:
(1) preparation of component A castor oil, polytetrahydrofuran dihydric alcohol 3000 and polytetrahydrofuran dihydric alcohol 5000 are added into a reaction kettle, the temperature is raised to 100 ℃, vacuum dehydration is carried out for 2 hours, and the vacuum degree is more than or equal to 0.08 MPa; cooling to 80 ℃, adding 20 parts of toluene diisocyanate, and reacting for 1h under heat preservation; adding 1, 4-butanediol, and reacting for 1h at the temperature of 80 ℃; adding 260 parts of toluene diisocyanate, and reacting for 3 hours at the temperature of 80 ℃; adding the remaining 150 parts of hexamethylene diisocyanate, cooling to 40 ℃, dropwise adding gamma-aminopropyltriethoxysilane, stirring for 0.5h after dropwise adding, adding triphenyl phosphate, stirring for 1h, discharging, sealing and storing to obtain a component A;
(2) preparing a component B: adding dibutyl phthalate, amino-terminated polyether 1000 and a vulcanizing agent MOCA into a reaction kettle, stirring, adding mica, molybdenum disulfide and an antioxidant 245, heating while stirring, heating to 120 ℃, performing vacuum dehydration for 2 hours, wherein the vacuum degree is more than or equal to 0.08MPa, cooling to 80 ℃, adding gas-phase titanium dioxide, stirring, cooling, discharging, and performing sealed preservation to obtain a component B;
(3) preparing a damping material: mixing the component A and the component B according to the mass ratio of 1:2, and stirring to obtain the composition.
Construction and spraying: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
Example 5
A spray type castor oil-based polyurethane damping material is prepared from a component A and a component B according to the weight ratio of 1:3 in a mass ratio;
the component A is prepared from the following raw materials in parts by mass: 400 parts of castor oil, 1000400 parts of polytetrahydrofuran dihydric alcohol, 700 parts of diisocyanate, 30 parts of neopentyl glycol, 10 parts of gamma-aminopropyltriethoxysilane and 300 parts of dibutyl phthalate; wherein the castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; polytetrahydrofuran diol 1000 has a functionality of 2;
the component B comprises the following raw materials in parts by weight: 1000450 parts of amino-terminated polyether, 20 parts of vulcanizing agent MOCA, 200 parts of tricresyl phosphate, 500 parts of mica, 100 parts of boron nitride, 10765 parts of antioxidant and 10 parts of gas-phase aluminum oxide; wherein the amino-terminated polyether has a functionality of 3.
Preparing a spraying type castor oil-based polyurethane damping material:
(1) preparation of component A castor oil and polytetrahydrofuran diol 1000 are added into a reaction kettle, the temperature is raised to 100 ℃, vacuum dehydration is carried out for 2 hours, and the vacuum degree is more than or equal to 0.08 MPa; cooling to 80 ℃, adding 40 parts of toluene diisocyanate, and reacting for 2 hours in a heat preservation manner; adding neopentyl glycol, and reacting for 2 hours at the temperature of 80 ℃; then adding 500 parts of toluene diisocyanate, and reacting for 4 hours at the temperature of 80 ℃; adding 160 parts of p-phenyl diisocyanate, cooling to 50 ℃, dropwise adding gamma-aminopropyltriethoxysilane, stirring for 0.5h after dropwise adding, then adding dibutyl phthalate, stirring for 1h, discharging, sealing and storing to obtain a component A;
(2) preparing a component B: adding tricresyl phosphate, amine-terminated polyether 1000 and vulcanizing agent MOCA into a reaction kettle, stirring, adding mica, boron nitride and antioxidant 1076, heating while stirring, heating to 120 ℃, vacuum dehydrating for 2 hours, cooling to 80 ℃, adding gas-phase aluminum oxide, stirring, cooling, discharging, sealing and storing to obtain a component B;
(3) preparing a damping material: mixing the component A and the component B according to the mass ratio of 1:2, and stirring to obtain the composition.
Construction and spraying: the damping material obtained by uniformly stirring and mixing the component A and the component B is sprayed on the surface of the treated base material, and the damping material can be sprayed for multiple times until the thickness requirement is met.
Comparative example
Preparation of the component A: adding 800 parts of polytetrahydrofuran diol 2000 and 30 parts of chain extender dimethylolpropionic acid into a reaction kettle, heating to 100 ℃, carrying out vacuum dehydration for 2 hours, wherein the vacuum degree is more than 0.08MPa, cooling to 85 ℃, adding 470 parts of toluene diisocyanate, MDI-5020 parts of p-phenyl diisocyanate and 100 parts of organic solvent at one time, carrying out heat preservation reaction for 3.5 hours at 80 ℃, adding 300 parts of plasticizer phthalic acid ester dibutyl ester, stirring for 1 hour, discharging, packaging, sealing and storing to obtain a component A;
preparing a component B: adding 360 parts of plasticizer dioctyl phthalate, 450 parts of polyether polyol and 25 parts of vulcanizing agent MOCA into a reaction kettle, uniformly stirring, then sequentially and slowly adding 200 parts of inorganic filler mica and 2 parts of antioxidant 1010, heating up while stirring, heating to 120 ℃, vacuum dehydrating for 2 hours, keeping the vacuum degree above 0.08MPa, cooling to 65 ℃, adding rheological additive fumed silica, uniformly stirring, cooling to 50 ℃, discharging, packaging, sealing and storing to obtain a component B;
preparing a damping material: the components A and B are uniformly stirred and mixed according to the ratio of 1:2, and the mixture is sprayed on the surface of the treated base material.
The properties of the damping materials prepared in examples 1 to 3 and comparative example were examined.
The test method comprises the following steps: the tensile strength is tested according to GB/T1040-92, and the temperature range of the damping factor and the tan delta which are more than or equal to 0.3 is tested according to GB/T18258-2000.
The results are shown in Table 1.
TABLE 1 Performance data for damping materials prepared in examples 1-3 and comparative examples
As can be seen from Table 1, the damping materials prepared in examples 1-3 of the present invention have better tensile strength, damping factor, temperature range, etc. than the comparative examples.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A spray type castor oil-based polyurethane damping material is characterized by comprising a component A and a component B according to the weight ratio of 1: 2-3, and polymerizing;
the component A is prepared from the following raw materials in parts by mass: 700 parts of castor oil, 400 parts of polytetrahydrofuran polyalcohol, 400 parts of diisocyanate, 700 parts of micromolecular chain extender, 10-30 parts of silane coupling agent and 300 parts of plasticizer;
the component B comprises the following raw materials in parts by weight: 600 parts of amino-terminated polyether, 20-50 parts of vulcanizing agent, 500 parts of plasticizer, 600 parts of inorganic filler, 1-5 parts of antioxidant and 10-30 parts of rheological additive.
2. The spray-on castor oil-based polyurethane damping material of claim 1, wherein said castor oil has a hydroxyl functionality of 2.7 and a molecular weight of 931; preferably, the polytetrahydrofuran polyol has a functionality of 2 and a number average molecular weight of 1000-.
3. The spray type castor oil based polyurethane damping material according to claim 1 or 2, wherein the diisocyanate is any one or more of MDI-50, toluene diisocyanate, isophorone diisocyanate, and hexamethylene diisocyanate, which is a mixture of 4,4' -diphenylmethane diisocyanate and 2, 4-diphenylmethane diisocyanate.
4. The spray type castor oil based polyurethane damping material according to any one of claims 1 to 3, wherein the small molecule chain extender is any one of neopentyl glycol, trimethylolpropane, 1, 4-butanediol, dimethylolpropionic acid; preferably, the plasticizer is any one or more of dibutyl phthalate, dioctyl phthalate, triphenyl phosphate, tricresyl phosphate, chlorinated paraffin 52, long-chain paraffin and chlorinated palm oil methyl ester.
5. The spray type castor oil based polyurethane damping material as claimed in any one of claims 1 to 4, wherein said amino terminated polyether has a functionality of 3 and a number average molecular weight of 1000-.
6. The spray-on castor oil-based polyurethane damping material according to any of claims 1 to 5, wherein the vulcanizing agent is MOCA; the inorganic filler is any one or more of mica, graphite, molybdenum disulfide and boron nitride; the antioxidant is any one of antioxidant 245, antioxidant 1010, antioxidant 1035 and antioxidant 1076; the rheological additive is any one of gas-phase silicon dioxide, gas-phase titanium dioxide and gas-phase aluminum oxide.
7. A preparation method of the spray type castor oil based polyurethane damping material according to any one of claims 1 to 6, which comprises the following steps:
(1) preparation of the component A: adding castor oil and polytetrahydrofuran polyol into a reaction kettle, heating, and performing vacuum dehydration; cooling, adding part of diisocyanate, and reacting while keeping the temperature; adding a micromolecular chain extender, and carrying out heat preservation reaction; adding part of diisocyanate, and reacting at a constant temperature; adding the rest diisocyanate, cooling, dropwise adding a silane coupling agent, stirring after dropwise adding, adding a plasticizer, stirring, discharging, sealing and storing to obtain a component A;
(2) preparing a component B: adding a plasticizer, amino-terminated polyether and a vulcanizing agent into a reaction kettle, stirring, adding an inorganic filler and an antioxidant, heating while stirring, and performing vacuum dehydration; cooling, adding rheological additive, stirring, cooling, discharging, sealing and storing to obtain component B;
(3) preparing a damping material: mixing the component A and the component B in proportion, and stirring to obtain the composition.
8. The preparation method of the spray type castor oil based polyurethane damping material according to claim 7, wherein in the step (1), castor oil and polytetrahydrofuran polyol are added into a reaction kettle, the temperature is raised to 100 ℃, the dehydration is carried out in vacuum for 2 hours, and the vacuum degree is more than or equal to 0.08 MPa; cooling to 80 ℃, adding diisocyanate, and reacting for 1-2h under heat preservation; adding a micromolecular chain extender, and reacting for 1-2h at the temperature of 80 ℃; adding diisocyanate, and reacting for 3-4h at 80 ℃; adding the rest diisocyanate, cooling to 40-50 ℃, slowly dripping the silane coupling agent, stirring for 0.5h after dripping, adding the plasticizer, stirring for 1h, discharging, sealing and storing to obtain the component A.
9. The method for preparing spray type castor oil based polyurethane damping material according to claim 7 or 8, wherein in the step (1), the diisocyanate is added in three times, so that the-NCO/-OH value of the reaction system is gradually increased after each addition, and is respectively 0.1-0.5, 2-2.8 and 2.8-3.
10. The preparation method of the spray type castor oil based polyurethane damping material according to any one of claims 7 to 9, wherein in the step (2), the plasticizer, the amino terminated polyether and the vulcanizing agent are added into the reaction kettle and stirred uniformly, then the inorganic filler and the antioxidant are added, the temperature is raised while stirring, the temperature is raised to 120 ℃, the vacuum dehydration is carried out for 2 hours, the vacuum degree is more than or equal to 0.08MPa, the temperature is lowered to 80 ℃, the rheological additive is added, the stirring is carried out, the temperature is lowered to 50 ℃, the material is discharged, and the material is sealed and stored, so that the component B is obtained.
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| CN114478972A (en) * | 2021-12-24 | 2022-05-13 | 山东一诺威聚氨酯股份有限公司 | High-damping polyurethane elastomer for shock pad and preparation method thereof |
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