CN113801289A - High-hardness polyurethane blade material and preparation method of blade - Google Patents

High-hardness polyurethane blade material and preparation method of blade Download PDF

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Publication number
CN113801289A
CN113801289A CN202111220385.9A CN202111220385A CN113801289A CN 113801289 A CN113801289 A CN 113801289A CN 202111220385 A CN202111220385 A CN 202111220385A CN 113801289 A CN113801289 A CN 113801289A
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component
pouring
mold
parts
hardness
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许双喜
冯兴卓
曹彦海
朱军
张坚强
颜渊巍
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Zhuzhou Times New Material Technology Co Ltd
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Zhuzhou Times New Material Technology Co Ltd
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    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
    • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
    • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
    • C08G18/667—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6674—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
    • 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
    • C08G18/28—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
    • C08G18/3203—Polyhydroxy compounds
    • C08G18/3206—Polyhydroxy compounds aliphatic
    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/4009—Two or more macromolecular compounds not provided for in one single group of groups C08G18/42 - C08G18/64
    • C08G18/4045—Mixtures of compounds of group C08G18/58 with other macromolecular 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4804—Two or more polyethers of different physical or chemical nature
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    • 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
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/58—Epoxy resins
    • 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
    • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
    • C08G18/72—Polyisocyanates or polyisothiocyanates
    • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
    • C08G18/78—Nitrogen
    • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
    • C08G18/797—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing carbodiimide and/or uretone-imine groups

Abstract

A high-hardness polyurethane paddle material comprises a component A and a component B, wherein the component A mainly comprises polyether dihydric alcohol, polyether trihydric alcohol, polyether tetrahydric alcohol, 1, 3-butanediol, a defoaming agent, a catalyst and organic silicon epoxy resin, and the component B is carbodiimide modified MDI. The invention also discloses a method for preparing the high-hardness polyurethane blade paddle from the high-hardness polyurethane blade paddle material by the sectional pouring process. In the polyurethane paddle material, the organosilicon epoxy resin is introduced as a raw material, so that the hardness, toughness and hydrolysis resistance of the polyurethane material can be obviously improved. The invention selects the sectional casting process in the forming process, and the reaction of the process raw materials is carried out step by step, thereby relieving the problem of large heat release of the whole reaction of the raw materials and effectively solving the surface shrinkage defect of the product.

Description

High-hardness polyurethane blade material and preparation method of blade
Technical Field
The invention belongs to the technical field of polyurethane products, and particularly relates to a high-hardness, low-viscosity and low-reactivity blade material and a preparation method of a blade.
Background
The submersible propeller is an important device for establishing water flow in aeration tanks and anaerobic tanks of industrial and urban sewage treatment plants, and the water flow is pushed by contacting two stirring blades of an installation machine with sewage, so that multiple functions of water circulation, nitrification, denitrification, phosphorus removal and the like of the aeration tanks and the anaerobic tanks are exerted, and the stirring blades have important effects on the working efficiency and the service life of the submersible propeller to a certain extent.
Polyurethane materials are widely applied to underwater propellers due to excellent mechanical strength and hydrolysis resistance, but the blade paddles are generally prepared by using low-hardness polyurethane materials (the hardness is less than or equal to 95A) in the industry at present. The material of the blade is one of important factors influencing the mechanical performance of the blade and the efficiency of the submersible propeller, and the blade is easy to deform in the operation process due to low hardness value and small rigidity of the material, so that the propelling effect is influenced.
The hardness of the polyurethane material is improved, so that the mechanical performance of the blade can be improved, the energy consumption of equipment can be reduced, and the propulsion effect is improved, but the following difficulties exist in the preparation of the high-hardness polyurethane blade (the hardness is more than or equal to Shore D70):
(1) at present, a prepolymer method is generally adopted, and the method has the defects of high material viscosity, quick reaction and short operable time;
(2) because the polyurethane blade is a special-shaped piece, the size is uneven, and the forming is difficult. In the prior art, open normal pressure casting is generally used for special-shaped products, the process is feasible for preparing polyurethane materials with general hardness, but defects are easily generated for preparing high-hardness polyurethane materials with high shrinkage rate, and the normal pressure molding size precision is low.
Disclosure of Invention
The technical problem to be solved by the present invention is to overcome the disadvantages and drawbacks mentioned in the background art, and to provide a blade material with high hardness, low viscosity, and low reactivity, and a method for manufacturing a blade.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a high-hardness polyurethane blade material comprises a component A and a component B, wherein the component A is mainly prepared from the following raw materials in parts by weight:
50-65 parts of polyether glycol,
20-35 parts of polyether triol,
10-20 parts of polyether tetrahydric alcohol,
7-10 parts of 1, 3-butanediol,
0.5 to 2 parts of a defoaming agent,
0.05-1 part of a catalyst;
5-20 parts of organic silicon epoxy resin;
the component B is carbodiimide modified MDI.
In the polyurethane paddle material, the silicone epoxy resin is preferably one or more selected from ES-1001N, ES-1002T, ES-1023 produced by shin-Etsu chemical Co., Ltd or silicone epoxy resin No. 665 produced by Shanghai resin factory.
Preferably, the hydroxyl value of the polyether diol is 112 plus or minus 3mgKOH/g, the hydroxyl value of the polyether triol is 475 plus or minus 15mgKOH/g, and the hydroxyl value of the polyether tetraol is 430 plus or minus 10 mgKOH/g.
In the polyurethane paddle material, preferably, the defoaming agent is organic siloxane; the catalyst is a latent catalyst and is selected from one or more of AUCAT-RM301, CUCAT-RM60 and SA102 produced by Guangzhou Youyun chemical industry.
As a general inventive concept, the present invention also provides a method for preparing a high hardness polyurethane paddle, which comprises the following steps:
(1) placing the component A into a material tank A of a casting machine, placing the component B into a material tank B, starting stirring, and conveying the component A and the component B to a mixing chamber through a metering pump for casting;
(2) closing the mold and pressurizing;
(3) leading a hose from a mixing head of a pouring machine, discharging at the position of the pouring mixing head, enabling the hose to lean against the position of a pouring gate of a mold, ensuring that liquid flows along the wall of the mold, and pouring the mixture into the mold;
(4) adopting a sectional pouring process, respectively pouring the materials at 1/3 and 1/2, and staying for 10-50min to ensure the free shrinkage of the materials, and after the staying time is reached, continuously pouring the hose along the wall of the mold until the whole mold is fully poured;
(5) after the pouring is finished, a piston is arranged at the pouring gate to pressurize the raw materials at the pouring gate;
(6) and after pressurization is finished, heating and curing are carried out, pressure is relieved after curing is finished, and the product is taken out to obtain the high-hardness polyurethane blade finished product.
In the above preparation method, preferably, in the step (1), the mixing ratio of the component A and the component B is: 100 parts of component A and 95-105 parts of component B.
Preferably, in the preparation method, in the step (1), the temperature of the component A is controlled to be 50-60 ℃, and the temperature of the component B is controlled to be 30-45 DEG C
In the preparation method, preferably, in the step (2), the mold clamping pressure is 5-10MPa, and the mold temperature is 50-60 ℃.
In the above production process, preferably, in the step (5), the pressure for pressurization is 2 to 5 MPa.
In the preparation method, preferably, in the step (6), the temperature of the mold is increased to 80-110 ℃, and the mold is cured for 2-4 hours.
Compared with the prior art, the invention has the advantages that:
(1) in the polyurethane paddle material, the organosilicon epoxy resin is introduced as a raw material, so that the hardness, toughness and hydrolysis resistance of the polyurethane material can be obviously improved.
(2) Compared with the conventional catalyst, the latent catalyst is selected, the polyurethane paddle material has the advantages of slow reaction in the initial stage, low viscosity, good fluidity, easier filling into a mold cavity, better product appearance and long operable time, and is very suitable for molding large-scale complex parts.
(3) The invention selects the sectional casting process in the forming process, and the reaction of the process raw materials is carried out step by step, thereby relieving the problem of large heat release of the whole reaction of the raw materials and effectively solving the surface shrinkage defect of the product.
(4) In the forming process of the invention, the pouring gate is pressurized after the pouring is finished, so that the product is more compact, the internal bubbles are broken, the quality is improved, and the product has high dimensional precision.
(5) In the forming process, a staged heating process is selected, the initial state is low in temperature, the reaction of the materials is slow, the fluidity is good, the cavity is filled with the materials, the staged heating is realized, the materials react gradually, the internal stress of the product is small, and the appearance quality is good.
Drawings
FIG. 1 is a diagram showing the arrangement of the mold used in the process of preparing the high-hardness polyurethane blade according to the present invention.
FIG. 2 is a schematic diagram of a mold in the process of pouring the high-hardness polyurethane blade in sections.
FIG. 3 is a schematic view of the piston used for pressurizing the pouring gate after the completion of pouring in the process of preparing the high-hardness polyurethane paddle according to the present invention.
FIG. 4 shows the preparation of a high hardness polyurethane paddle product according to the present invention.
Illustration of the drawings:
1. a pouring gate; 2. a blade tip; 3. a blade root; 4. a metal shaft; 5. 2/3 stay there; 6. 1/3 stay there; 7. a piston.
Detailed Description
In order to facilitate an understanding of the invention, the invention will be described more fully and in detail below with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1:
the high-hardness polyurethane blade material comprises a component A and a component B, wherein the component A is prepared by putting the following raw materials in parts by weight into a reactor, dehydrating for 2 hours at the temperature of 110 ℃, and cooling to 50 ℃, wherein the raw materials are as follows: 55 parts of polyether diol (with a hydroxyl value of 112mgKOH/g), 30 parts of polyether triol (with a hydroxyl value of 475mgKOH/g), 20 parts of polyether tetraol (with a hydroxyl value of 430mgKOH/g), 7 parts of 1, 3-butanediol, 10 parts of No. 665 silicone epoxy resin, 1 part of organosiloxane defoamer and 0.1 part of catalyst AUCAT-RM 3010; the component B is 100 parts by weight of carbodiimide modified MDI.
The high-hardness polyurethane blade material of the embodiment is molded to prepare the high-hardness polyurethane blade, and the specific preparation process is as follows:
(1) before pouring, put into pouring machine A feed tank with A component, in B component put into the B feed tank, open the stirring, set for technological parameter: the temperature of the component A is 50 ℃, and the temperature of the component B is 30 ℃; conveying the component A and the component B to a mixing chamber through a metering pump for pouring, wherein the mixing ratio is as follows: 100 parts by mass of the component A and 95 parts by mass of the component B;
(2) the mode of placing the mould is shown in figure 1, a metal shaft 4 is placed in the middle, a blade root 3 is arranged below, and a blade tip 2 is arranged upwards, so that raw materials can flow into a mould cavity from a pouring gate 1; adhering a sealing strip to a mold, spraying a release agent, installing an iron piece, closing the mold and pressurizing, setting the pressure to be 10MPa, and setting the temperature of the mold to be 50 ℃;
(3) leading a hose from the mixing head, discharging the mixture at the position of the pouring mixing head, and enabling the hose to lean against the position of a pouring port 1 of the mold wall so as to ensure that the liquid flows along the mold wall;
(4) by adopting a sectional pouring process, the hose stays for 25 minutes when the hose is poured to a stopping position 6 of the mold 1/3 and a stopping position 5 of the mold 2/3 (shown in figure 2), and after the stopping time is reached, the hose is continuously poured along the mold wall until the whole mold is fully poured;
(5) after pouring, a piston 7 is installed at the pouring gate 1, and the piston 7 can pressurize the raw material at the pouring gate 1 (as shown in fig. 3), wherein the pressurizing pressure of the piston is 8 MPa;
(6) and after pressurization is finished, increasing the temperature of the die to 90 ℃ for curing, releasing pressure after curing for 2 hours, and taking out the product to obtain a finished product, wherein the finished product is shown in figure 4.
Comparative example 1:
the comparative example is different from the example 1 only in that no organic silicon epoxy resin is added into the high-hardness polyurethane blade material, and other raw materials, raw material contents and preparation processes are the same as those of the example 1.
The results of the performance test of the blade materials prepared in the example 1 and the comparative example 1 are shown in table 1, and it can be seen from table 1 that the hardness of the prepared blade material is 70D after the organosilicon epoxy resin is added, the hardness and the tensile strength of the material are obviously improved, the impact resistance is excellent, and the hydrolysis resistance is improved (the water absorption is reduced).
TABLE 1 Performance parameters of high hardness polyurethane blade materials prepared in example 1 and comparative example 1
Figure BDA0003312372530000041
Comparative example 2:
this example differs from example 1 only in that the catalyst AUCAT-RM301 was replaced with the conventional catalyst dibutyltin dilaurate, and other raw materials, raw material contents, and preparation processes were the same as those of example 1.
The gel property test results of the blade material mixtures prepared in example 1 and comparative example 2 are shown in table 2, and it can be seen from table 2 that the gel time of the high-hardness blade material in example 1 is 35min due to the adoption of the latent curing agent, and compared with the conventional catalyst, the gel time is greatly increased, the operable time is prolonged, and the material flowable time is long.
Table 2 gel properties of the material mixtures of example 1 and comparative example 2
Figure BDA0003312372530000051
Example 2:
the high-hardness polyurethane blade material comprises a component A and a component B, wherein the component A is prepared by putting the following raw materials in parts by weight into a reactor, dehydrating for 2 hours at the temperature of 115 ℃, and cooling to 60 ℃, wherein the raw materials are as follows: 60 parts of polyether diol (hydroxyl value of 112mgKOH/g), 20 parts of polyether triol (hydroxyl value of 475mgKOH/g), 15 parts of polyether tetraol (hydroxyl value of 430mgKOH/g), 10 parts of 1, 3-butanediol, 15 parts of No. 665 silicone epoxy resin, 2 parts of organosiloxane defoamer and an AUCAT-RM 3010.5 part as catalyst; the component B is carbodiimide modified MDI.
The high-hardness polyurethane blade material of the embodiment is molded to prepare the high-hardness polyurethane blade, and the specific preparation process is as follows:
(1) before pouring, put into pouring machine A feed tank with A component, in B component put into the B feed tank, open the stirring, set for technological parameter: the temperature of the component A is 55 ℃, and the temperature of the component B is 35 ℃; conveying the component A and the component B to a mixing chamber through a metering pump for pouring, wherein the mixing ratio is as follows: 100 parts of component A and 101 parts of component B;
(2) the mode of placing the mould is shown in figure 1, a metal shaft 4 is placed in the middle, a blade root 3 is arranged below, and a blade tip 2 is arranged upwards, so that raw materials can flow into a mould cavity from a pouring gate 1; adhering a sealing strip to a mold, spraying a release agent, installing an iron piece, closing the mold and pressurizing, wherein the pressure is set to be 15MPa, and the temperature of the mold is set to be 55 ℃;
(3) leading a hose from the mixing head, discharging the mixture at the position of the pouring mixing head, and enabling the hose to lean against the position of a pouring port 1 of the mold wall so as to ensure that the liquid flows along the mold wall;
(4) respectively staying for 10 minutes (shown in figure 2) when the hose is poured to a stopping position 6 of the mould 1/3 and a stopping position 5 of the mould 2/3 by adopting a sectional pouring process, and continuing pouring the hose along the wall of the mould until the whole mould is fully poured;
(5) after pouring, a piston 7 is installed at the pouring gate 1, and the piston 7 can pressurize the raw material at the pouring gate 1 (as shown in fig. 3), wherein the pressurizing pressure of the piston is 5 MPa;
(6) and after pressurization is finished, increasing the temperature of the die to 100 ℃ for curing, releasing pressure after curing for 3h, and taking out the product to obtain a finished product.
The gel time of the high-hardness paddle material in the embodiment is 40min, and compared with the conventional prepolymerization method polyurethane, the gel time is greatly increased, and the operable time is prolonged.
Compared with the common casting process, the high-hardness blade pulp product prepared by the embodiment has the advantages of better overall appearance, smooth surface, no shrinkage, no glue shortage and no bubble defect.
The performance test results of the high-hardness blade material prepared in the embodiment are shown in table 3, and as can be seen from table 3, the hardness of the prepared material is 68D, the hardness and the tensile strength of the material are obviously improved, the impact performance is excellent, and the hydrolysis resistance is improved (the water absorption is reduced).
TABLE 3 Property parameters of the high hardness polyurethane blade material prepared in example 2
Detecting item points Example 2 Test standard
Gel time/min of the mixture 40 GB/T 12007.7
Hardness (Shore D) 68 GB/T531
Tensile Strength (MPa) 45 GB/T528
Elongation at Break (%) 25 GB/T528
The toughness of the material: impact Strength (KJ/m)2) 125 GB/T1043.1
Hydrolysis resistance: water absorption percentage% 0.30 GB/T1034
Example 3:
the high-hardness polyurethane blade material comprises a component A and a component B, wherein the component A is prepared by putting the following raw materials in parts by weight into a reactor, dehydrating for 2.5 hours at 105 ℃, and cooling to 55 ℃, wherein the raw materials are as follows: 50 parts of polyether diol (hydroxyl value of 112mgKOH/g), 35 parts of polyether triol (hydroxyl value of 475mgKOH/g), 13 parts of polyether tetraol (hydroxyl value of 430mgKOH/g), 8 parts of 1, 3-butanediol, 8 parts of No. 665 silicone epoxy resin, 1.5 parts of organosiloxane defoamer and AUCAT-RM 3010.3 parts of catalyst; the component B is carbodiimide modified MDI.
The high-hardness polyurethane blade material of the embodiment is molded to prepare the high-hardness polyurethane blade, and the specific preparation process is as follows:
(1) before pouring, put into pouring machine A feed tank with A component, in B component put into the B feed tank, open the stirring, set for technological parameter: the temperature of the component A is 60 ℃, and the temperature of the component B is 40 ℃; conveying the component A and the component B to a mixing chamber through a metering pump for pouring, wherein the mixing ratio is as follows: 100 parts by mass of the component A and 95 parts by mass of the component B;
(2) the mode of placing the mould is shown in figure 1, a metal shaft 4 is placed in the middle, a blade root 3 is arranged below, and a blade tip 2 is arranged upwards, so that raw materials can flow into a mould cavity from a pouring gate 1; adhering a sealing strip to a mold, spraying a release agent, installing an iron piece, closing the mold and pressurizing, setting the pressure to be 20MPa and the temperature of the mold to be 60 ℃;
(3) leading a hose from the mixing head, discharging the mixture at the position of the pouring mixing head, and enabling the hose to lean against the position of a pouring port 1 of the mold wall so as to ensure that the liquid flows along the mold wall;
(4) respectively staying for 30 minutes (shown in figure 2) when the hose is poured to a stopping position 6 of the mould 1/3 and a stopping position 5 of the mould 2/3 by adopting a sectional pouring process, and continuing pouring the hose along the wall of the mould until the whole mould is fully poured;
(5) after pouring, a piston 7 is installed at the pouring gate 1, and the piston 7 can pressurize the raw material at the pouring gate 1 (as shown in fig. 3), wherein the pressurizing pressure of the piston is 3 MPa;
(6) and after pressurization is finished, increasing the temperature of the die to 110 ℃ for curing, releasing pressure after curing for 2.5 hours, and taking out the product to obtain a finished product.
The gel time of the high-hardness paddle material in the embodiment is 30min, and compared with the conventional prepolymerization method polyurethane, the gel time is greatly increased, and the operable time is prolonged.
Compared with the common casting process, the high-hardness blade pulp product prepared by the embodiment has the advantages of better overall appearance, smooth surface, no shrinkage, no glue shortage and no bubble defect.
The performance test results of the high-hardness blade material prepared in the embodiment are shown in table 4, and as can be seen from table 4, the hardness of the prepared material is 75D, the hardness and the tensile strength of the material are obviously improved, the impact performance is excellent, and the hydrolysis resistance is improved (the water absorption is reduced).
TABLE 4 Property parameters of the high hardness polyurethane blade material prepared in example 3
Detecting item points Example 3 Test standard
Gel time/min of the mixture 30 GB/T 12007.7
Hardness (Shore D) 75 GB/T531
Tensile Strength (MPa) 55 GB/T528
Elongation at Break (%) 15 GB/T528
The toughness of the material: impact Strength (KJ/m)2) 115 GB/T1043.1
Hydrolysis resistance: water absorption percentage% 0.15 GB/T1034

Claims (10)

1. The high-hardness polyurethane blade material is characterized by comprising a component A and a component B, wherein the component A mainly comprises the following raw materials in parts by weight:
50-65 parts of polyether glycol,
20-35 parts of polyether triol,
10-20 parts of polyether tetrahydric alcohol,
5-20 parts of organic silicon epoxy resin,
7-10 parts of 1, 3-butanediol,
0.5 to 2 parts of a defoaming agent,
0.05-1 part of a catalyst;
the component B is carbodiimide modified MDI.
2. The polyurethane paddle material of claim 1, wherein the silicone epoxy resin is one or more selected from the group consisting of ES-1001N, ES-1002T, ES-1023 manufactured by shin-Etsu chemical Co., Ltd, and silicone epoxy resin No. 665 manufactured by Shanghai resin factory.
3. The polyurethane paddle material of claim 1, wherein the polyether diol has a hydroxyl value of 109 to 115mgKOH/g, the polyether triol has a hydroxyl value of 460 to 490mgKOH/g, and the polyether tetraol has a hydroxyl value of 420 to 440 mgKOH/g.
4. The polyurethane paddle material of claim 1, wherein the defoamer is an organosiloxane; the catalyst is one or more selected from AUCAT-RM301, CUCAT-RM60 and SA102 produced by Guangzhou Yougun chemical industry.
5. A method for preparing a high-hardness polyurethane blade by using the high-hardness polyurethane blade material according to any one of claims 1 to 4, comprising the steps of:
(1) placing the component A into a material tank A of a casting machine, placing the component B into a material tank B, starting stirring, and conveying the component A and the component B to a mixing chamber through a metering pump for casting;
(2) closing the mold and pressurizing;
(3) leading a hose from a mixing head of a pouring machine, discharging at the position of the pouring mixing head, enabling the hose to lean against the position of a pouring gate of a mold, ensuring that liquid flows along the wall of the mold, and pouring the mixture into the mold;
(4) adopting a sectional pouring process, respectively pouring the materials into the molds 1/3 and 1/2, and staying for 10-50min to ensure the free shrinkage of the materials, and after the staying time is reached, continuously pouring the hose along the mold wall until the whole mold is fully poured;
(5) after the pouring is finished, a piston is arranged at the pouring gate to pressurize the raw materials at the pouring gate;
(6) and after pressurization is finished, heating and curing are carried out, pressure is relieved after curing is finished, and the product is taken out to obtain the high-hardness polyurethane blade finished product.
6. The method according to claim 5, wherein in the step (1), the A-component and the B-component are mixed in a ratio of: 100 parts of component A and 95-105 parts of component B.
7. The method according to claim 5, wherein in the step (1), the temperature of the component A is controlled to be 50 to 60 ℃ and the temperature of the component B is controlled to be 30 to 45 ℃.
8. The method according to claim 5, wherein in the step (2), the mold clamping pressure is 10-20MPa, and the mold temperature is 50-60 ℃.
9. The production method according to claim 5, wherein in the step (5), the pressure of the pressurization is 2 to 10 MPa.
10. The method according to claim 5, wherein in the step (6), the mold is cured for 2 to 4 hours while the temperature of the mold is increased to 80 to 110 ℃.
CN202111220385.9A 2021-10-20 2021-10-20 High-hardness polyurethane blade material and preparation method of blade Pending CN113801289A (en)

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Application publication date: 20211217