CN113088237A - Environment-friendly high-performance polyurethane pouring sealant and preparation method thereof - Google Patents
Environment-friendly high-performance polyurethane pouring sealant and preparation method thereof Download PDFInfo
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- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
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- C09J175/06—Polyurethanes from polyesters
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- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/4288—Polycondensates having carboxylic or carbonic ester groups in the main chain modified by higher fatty oils or their acids or by resin acids
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- 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
- C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
- C08G18/44—Polycarbonates
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- 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
- C08G18/721—Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
- C08G18/725—Combination of polyisocyanates of C08G18/78 with other polyisocyanates
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- 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
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
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- 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
- C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
- C08G18/76—Polyisocyanates or polyisothiocyanates cyclic aromatic
- C08G18/7657—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings
- C08G18/7664—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups
- C08G18/7671—Polyisocyanates or polyisothiocyanates cyclic aromatic containing two or more aromatic rings containing alkylene polyphenyl groups containing only one alkylene bisphenyl group
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- 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
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
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- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/02—Flame or fire retardant/resistant
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- C08L2201/00—Properties
- C08L2201/22—Halogen free composition
Abstract
The application relates to the field of adhesives, and particularly discloses an environment-friendly high-performance polyurethane pouring sealant and a preparation method thereof. The environment-friendly high-performance polyurethane pouring sealant comprises a component A and a component B, wherein the component A comprises 55-65% by weight of polyester polyol, 15-25% by weight of castor oil and the balance of a first mixed auxiliary agent; the component B comprises 15-25 wt% of liquefied MDI I, 25-35 wt% of liquefied MDI II, 10-20 wt% of liquefied MDI III and the balance of a mixed auxiliary agent II; the liquefied MDI I is polymethylene polyphenyl isocyanate; the liquefied MDI II consists of 50wt% of 2,4 '-diphenylmethane diisocyanate and 50wt% of 4,4' -diphenylmethane diisocyanate; the liquefied MDI III is carbodiimide modified isocyanate. The polyurethane pouring sealant has excellent water resistance, waterproofness, electric insulation and superior comprehensive use performance.
Description
Technical Field
The application relates to the field of adhesives, in particular to an environment-friendly high-performance polyurethane pouring sealant and a preparation method thereof.
Background
Polyurethane pouring sealant is generally a polymer formed by reaction and solidification of polyol and isocyanate, has excellent adhesive property and insulating property, and is commonly used in the electronic component industry to play roles in gluing, positioning and packaging electronic components and the like.
Currently, two-component polyurethane pouring sealants are often used in order to adjust the curing rate of the polyurethane pouring sealant. In the related technology, the patent with publication number CN106634792A discloses a waterproof antistatic two-component polyurethane sealant and a preparation method thereof, wherein polyester polyol, polyether polyol and toluene diisocyanate are adopted for reaction and curing, and an auxiliary agent is added to improve the waterproof and antistatic performances; and the patent with publication number CN106928837A discloses an HBS two-component polyurethane waterproof coating and a preparation method thereof, which is formed by reacting and curing isocyanate prepolymer and resin containing hydroxyl groups, and improves the waterproof performance.
Considering the application occasions of the polyurethane pouring sealant, when the polyurethane pouring sealant acts on the occasions such as a washing machine, a dish washing machine and the like, the polyurethane pouring sealant needs to meet the following requirements: firstly, the polyurethane pouring sealant has better waterproof performance, and the polyurethane pouring sealant is contacted with moisture for a long time, so that the moisture is easy to permeate into the pouring sealant, and electronic components wrapped in the pouring sealant are short-circuited; secondly, the adhesive strength is high, the polyurethane pouring sealant is easy to be corroded by moisture to cause the cracking of a glue layer, and the adhesive property is insufficient; and finally, the polyurethane pouring sealant has good insulating property, is sensitive to temperature and moisture, is in an insulating state when being glued, and is beneficial to reducing the possibility of short circuit when the electronic element is used.
Therefore, the comprehensive use performance of the polyurethane pouring sealant still has room for improvement.
Disclosure of Invention
In order to improve the comprehensive use performance of the polyurethane pouring sealant, the application provides the environment-friendly high-performance polyurethane pouring sealant and the preparation method thereof.
In a first aspect, the application provides an environment-friendly high-performance polyurethane pouring sealant, which adopts the following technical scheme: the environment-friendly high-performance polyurethane pouring sealant comprises a component A and a component B, and is characterized in that the component A comprises 55-65% of polyester polyol, 15-25% of castor oil and the balance of a first mixed auxiliary agent in percentage by weight; the component B comprises 15-25 wt% of liquefied MDI I, 25-35 wt% of liquefied MDI II, 10-20 wt% of liquefied MDI III and the balance of a mixed auxiliary agent II;
the liquefied MDI I is polymethylene polyphenyl isocyanate;
the liquefied MDI II consists of 50wt% of 2,4 '-diphenylmethane diisocyanate and 50wt% of 4,4' -diphenylmethane diisocyanate;
the liquefied MDI III is carbodiimide modified isocyanate.
By adopting the technical scheme, the polyester polyol is modified by the castor oil in the component A to obtain the castor oil modified polyester polyol, and the free diisocyanate content is adjusted by compounding three liquefied MDI in the component B so as to control the reaction activity. When the component A and the component B are mixed, the hydroxyl of the castor oil modified polyester polyol and free isocyanate in three liquefied MDI have high curing reaction rate, multiple polyurethane chain segments are tightly wound, the crosslinking density is increased, the waterproof performance is improved, moisture is not easy to permeate, the dissociation difficulty of hydrogen bonds in the polyurethane pouring sealant is increased due to the high crosslinking density, the constraint of polar groups, ions and the like is high, the volume resistivity of the polyurethane pouring sealant is high, and the electric insulation property is good. Meanwhile, carboxyl of the castor oil modified polyester polyol reacts with carbodiimide bonds of the carbodiimide modified isocyanate to generate ureide, so that hydrolysis of the polyurethane pouring sealant can be effectively inhibited, and therefore, the comprehensive use performance of the polyurethane is improved;
in addition, the application also has the following advantages: firstly, the main components in the component A and the component B are in liquid states, no additional solvent is needed to be added, and no harmful gas or organic solvent is volatilized in the process of forming the polyurethane pouring sealant by the reaction of the component A and the component B, so that the environment-friendly polyurethane pouring sealant is green and environment-friendly; secondly, compared with the conventional pure MDI, the cost of the three liquefied MDI used in the component B is reduced from 3.49-3.87 ten thousand yuan/ton to 2.94-3.12 ten thousand yuan/ton, and the cost of each ton is reduced by at least 0.37 ten thousand yuan; thirdly, the A component and the B component are added with the auxiliary agent, so that the proportion of the A component and the B component can be conveniently regulated and controlled, and the sizing of the polyurethane pouring sealant is facilitated.
Preferably, the polyester polyol is a polycarbonate polyol.
By adopting the technical scheme, the polycarbonate polyol and the three liquefied MDI are cured and crosslinked, compared with the traditional polyester polyol (polyester polyol formed by polycondensation of dibasic acid and dihydric alcohol), the content of ester bonds in a formed polyurethane crosslinking network is reduced, and the hydrolysis resistance is improved.
Preferably, the polymethylene polyphenyl isocyanate has an average functionality of 2.1 to 2.9.
Preferably, the carbodiimide-modified isocyanate has an isocyanate group content of 25.5 to 30 wt%.
By adopting the technical scheme, within the range of the average functionality and the content of isocyanate groups, the three liquefied MDI in the component B have high reactivity, low viscosity and larger crosslinking density of polyurethane chain segments, and the polyurethane pouring sealant has better waterproof performance and electrical insulation performance.
Preferably, the first mixing aid in the component A comprises a flame retardant, a coupling agent, a defoaming agent and a plasticizer, and the weight ratio of the first mixing aid to the flame retardant, the coupling agent, the defoaming agent and the plasticizer is 100: 8: 2: 90, respectively; the second mixing aid in the component B comprises a flame retardant and a plasticizer, and the weight ratio of the flame retardant to the plasticizer of the second mixing aid is 3: 4.
by adopting the technical scheme, the flame retardant property, the waterproof property, the low-temperature toughness and the foam discharging property of the polyurethane pouring sealant can be improved by the aid of the first mixing aid and the second mixing aid, and meanwhile, the use amounts of the component A and the component B are easy to regulate and control during glue application.
Preferably, the flame retardant is a halogen-free phosphate ester.
By adopting the technical scheme, the halogen-free phosphate flame retardant is generally a liquid flame retardant, and compared with a solid halogen-free flame retardant, the halogen-free phosphate flame retardant has better compatibility with the component A and the component B, so that the coating effect of the polyurethane pouring sealant is better, the thickness of the polyurethane pouring sealant is uniform, and the electrical insulation property is better on the premise of ensuring the flame retardant effect.
Preferably, the plasticizer is a polyester plasticizer.
By adopting the technical scheme, the flexible chain segment contained in the polyester plasticizer improves the toughness of the polyurethane pouring sealant, so that the polyurethane pouring sealant is not easy to embrittle and crack.
Preferably, the defoamer is a silicone defoamer.
Preferably, the coupling agent is a silane coupling agent.
By adopting the technical scheme, the organic silicon defoaming agent has the functions of instantaneous defoaming and lasting foam inhibition, but the performance of the polyurethane pouring sealant can be reduced when the doping amount of the organic silicon defoaming agent is too large, and the silicon-oxygen group contained in the silane coupling agent can be hydrolyzed to generate the silanol group.
In a second aspect, the application provides a preparation method of a polyurethane pouring sealant, which adopts the following technical scheme:
a preparation method of polyurethane pouring sealant comprises the following steps:
preparation of component A: weighing polyester polyol, castor oil and a first mixed assistant in a formula ratio, heating to 100 +/-10 ℃ under stirring, carrying out heat preservation reaction for 3 hours, and removing water and bubbles under vacuum conditions to obtain a component A;
and B component: weighing the liquefied MDI I, the liquefied MDI II, the liquefied MDI III and the mixed auxiliary agent II according to the formula ratio, and removing water and defoaming under the vacuum condition to obtain a component B;
when the polyurethane pouring sealant is used: stirring and mixing the component A and the component B according to the mass ratio of 1 (1-2).
By adopting the technical scheme, after the component A and the component B are subjected to vacuum dehydration and bubble removal, the moisture content of the component A and the component B is detected, the qualified component A and the component B are detected and then are stored in a sealed mode, the polyurethane pouring sealant is prepared according to the use requirement, the polyurethane pouring sealant is applied to occasions in long-term contact with water, and the polyurethane pouring sealant has good waterproof performance, hydrolysis resistance, adhesive property and electrical insulation performance and good comprehensive use performance.
In summary, the present application has the following beneficial effects:
1. according to the application, polyester polyol is grafted on a castor oil side chain in the component A to obtain castor oil modified polyester polyol, the content of the hydroxyl value of the castor oil modified polyester polyol is high, and the component B contains polymethylene polyphenyl isocyanate, 2,4 '-diphenylmethane diisocyanate, 4' -diphenylmethane diisocyanate, carbodiimide modified isocyanate and other substances, so that the component A and the component B have high reaction activity during reaction, polyurethane chain segments are diversified, the cross-linking density of the polyurethane pouring sealant is increased, the waterproof performance and the electric insulation performance are good, meanwhile, the polyurethane pouring sealant contains carbodiimide bonds, the hydrolysis of the polyurethane pouring sealant is effectively inhibited, and the comprehensive use performance of the polyurethane pouring sealant is improved;
2. in the application, the polyester polyol is preferably polycarbonate polyol, the liquefied MDI is preferably polymethylene polyphenyl isocyanate with the average functionality of 2.1-2.9, the liquefied MDI is preferably carbodiimide modified isocyanate with the isocyanate group content of 25.5-30 wt%, and the isocyanate group content is controlled in the polyurethane pouring sealant, so that the curing rate is controlled, the ester bond content is reduced, the crosslinking curing density is improved, and the comprehensive use performance is further improved;
3. in the application, the halogen-free phosphate flame retardant, the polyester plasticizer, the silane coupling agent and the organic silicon defoamer are used as the auxiliary agents, and the comprehensive use performance of the polyurethane pouring sealant is improved under the cooperation of the four auxiliary agents.
Detailed Description
Unless otherwise specified, the sources of the raw materials in the following examples and comparative examples are shown in table 1 below:
TABLE 1 sources of raw materials
Examples
An environment-friendly high-performance polyurethane pouring sealant is prepared by the following preparation method:
preparation of component A:
p1, weighing polyester polyol (JHK-0924), castor oil, a nitrogen and phosphorus flame retardant, dioctanoate phthalate, a titanate coupling agent and sodium polyacrylate according to the formula in the following table 2, stirring the substances at the rotating speed of 600rpm, heating to 100 +/-10 ℃, carrying out heat preservation reaction for 3 hours, drying for 2 hours under the conditions of 50 ℃ and-0.9 MPa, detecting the water content, the acid value and the like, and sealing after the substances are qualified to obtain a component A;
preparation of the component B: weighing polymethylene polyphenyl isocyanate (the brand is SUPRASEC 9465), liquefied MDI (the brand is WANNATE MDI-50), carbodiimide modified isocyanate (the brand is Millionote MTL), a nitrogen-phosphorus flame retardant and dioctoate phthalate according to the formula in the following table 2, stirring and uniformly mixing for 5min at the rotating speed of 600rpm, drying for 2h under the conditions of 50 ℃ and 0.9MPa, detecting the water content, the acid value and the like, and sealing after the components are qualified to obtain a component B;
when the polyurethane pouring sealant is needed, 100g of the component A and 100g of the component B are taken and stirred uniformly for 10s at the rotating speed of 600rpm to prepare the polyurethane pouring sealant.
Examples 1 to 15
Examples 1-15 were prepared as described above, with the exception that examples 1-15 were prepared as follows: the compositions of the component A and the component B in each example are different, and the specific compositions are shown in the following table 2:
TABLE 2 compositions of A Components and B Components in examples 1-15
Example 12
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 10 in that: polycarbonate polyol with the trademark Desmophen C1100 and the like are used for replacing polyester polyol with the trademark JHK-0924.
Examples 13 to 14
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 12 in that: the average functionality of the polymethylene polyphenyl isocyanates was varied, and the polymethylene polyphenyl isocyanate having the average functionality of 2.5 was used in example 13, and the polymethylene polyphenyl isocyanate having the average functionality of 2.9 was used in example 14.
Examples 15 to 16
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 14 in that: the carbodiimide-modified isocyanate used in example 15 has an isocyanate group content of 27.5 to 29.5 wt%, and the carbodiimide-modified isocyanate used in example 16 has an isocyanate group content of 25.5 to 26.5 wt%, depending on the isocyanate group content of the carbodiimide-modified isocyanate.
Example 17
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 14 in that: the component A and the component B both use halogen-free phosphate ester flame retardant (the brand number is LA-Q7) with equal mass to replace nitrogen phosphorus flame retardant.
Example 18
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 17 in that: equal mass of polyester plasticizer (Hexamoll DINCH) was used in both component A and component B instead of dioctanoate phthalate.
Example 19
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 18 in that: an equivalent mass of silane coupling agent (trade name LA-a03) was used in place of the titanate coupling agent.
Example 20
An environment-friendly high-performance polyurethane pouring sealant is different from the sealant in example 18 in that: an equal mass of silicone defoamer (trade name XST-7008) was used instead of sodium polyacrylate.
Comparative example
Comparative examples 1 to 5
The polyurethane pouring sealant is different from the polyurethane pouring sealant in example 1 in that: the compositions of the B component are different, and the specific compositions are shown in the following table 3.
TABLE 3 composition of B component
| B component | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | Comparative example 5 | Comparative example 6 |
| Suprasec 9465/g | / | 25 | 25 | / | / | 50 |
| WANNATE MDI-50/g | 25 | / | 25 | / | / | / |
| Millionate MTL/g | 25 | 25 | / | 50 | 0 | / |
| Nitrogen phosphorus flame retardant/g | 21.4 | 21.4 | 21.4 | 21.4 | 21.4 | 21.4 |
| Dioctanoate/g phthalate | 28.6 | 28.6 | 28.6 | 28.6 | 28.6 | 28.6 |
Comparative example 7
The polyurethane pouring sealant is different from the polyurethane pouring sealant in example 1 in that: equal mass of polyester polyol (JHK-0924) is used in the A component to replace castor oil.
Performance test
Detection method
Firstly, physical property detection: the tested ambient temperature was 23 + -2 deg.C and ambient humidity was 50 + -5% RH, with the test items as shown in the following table:
secondly, detecting hydrolysis resistance and waterproof performance:
sample preparation: samples of examples 1 to 20 and comparative examples 1 to 7 were prepared by injecting them into a casting device (having a specification of 5 cm. times.5 cm);
the samples after being soaked for 7 days at normal temperature and the samples after being soaked for 7 days in hot water at 70 ℃ are tested for the retention rate of water absorption and elongation at break according to GB/T19250-2013.
The result of the detection
TABLE 4 detection results of physical properties of polyurethane pouring sealant
TABLE 5 results of testing hydrolysis resistance and water resistance of polyurethane casting glue
The main evaluation indexes of the toughness of the polyurethane pouring sealant are tensile strength and elongation at break.
The detection results of examples 1-11, comparative examples 1-7 and tables 4-5 show that the polyurethane pouring sealant prepared by compounding three kinds of liquefied MDI and reacting with the castor oil modified polyester polyol has high flame retardant grade, large volume resistivity and high toughness evaluation index value, and the flame retardant property, the electric insulation property and the physical property are excellent, meanwhile, through the water resistance and waterproof property tests, the polyurethane pouring sealant is found to have the water absorption rate of less than or equal to 0.02% at normal temperature, hardly absorbs water at normal temperature and has good waterproof property, the breaking elongation retention rate is more than or equal to 80% after being soaked for 7 days at normal temperature, and the hydrolysis resistance is good.
In addition, after the soaking temperature is increased, the test sample is subjected to water resistance and waterproof performance tests, and the test sample is found to have excellent waterproof performance at high temperature, the water absorption rate is less than or equal to 0.15 percent and is far lower than the national specified water absorption rate by 0.3 percent, the breaking elongation retention rate is more than or equal to 68.1 percent, the performance under the high-temperature and high-humidity environment is stable, and the comprehensive service performance is good.
The detection results of examples 12-16 and tables 4-5 show that the physical properties, water resistance and water resistance of the polyurethane pouring sealant can be effectively improved by selecting the characteristic parameters of the polyester polyol of the component A and the three liquefied MDI of the component B, the water absorption rate under the high-temperature and high-humidity condition is only increased by 0.12-0.13%, the breaking elongation retention rate is not less than 73.1%, and the comprehensive service performance is excellent.
The detection results of the examples 17 to 20 and the tables 4 to 5 show that the use of the halogen-free phosphate flame retardant, the polyester plasticizer, the silane coupling agent and the organic silicon defoamer as the auxiliary agents can effectively improve the physical properties of the polyurethane pouring sealant, and simultaneously, the polyurethane pouring sealant is not sensitive to moisture and temperature and has good comprehensive use performance.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. An environment-friendly high-performance polyurethane pouring sealant, which comprises a component A and a component B and is characterized in that,
the component A comprises 55-65% of polyester polyol, 15-25% of castor oil and the balance of a first mixed auxiliary agent in percentage by weight;
the component B comprises 15-25 wt% of liquefied MDI I, 25-35 wt% of liquefied MDI II, 10-20 wt% of liquefied MDI III and the balance of a mixed auxiliary agent II;
the liquefied MDI I is polymethylene polyphenyl isocyanate;
the liquefied MDI II consists of 50wt% of 2,4 '-diphenylmethane diisocyanate and 50wt% of 4,4' -diphenylmethane diisocyanate;
the liquefied MDI III is carbodiimide modified isocyanate.
2. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 1, wherein: the polyester polyol is polycarbonate polyol.
3. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 1, wherein the average functionality of the polymethylene polyphenyl isocyanate is 2.1-2.9.
4. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 3, wherein the carbodiimide modified isocyanate has an isocyanate group content of 25.5 to 30 wt%.
5. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 1, wherein a first mixing aid in the component A comprises a flame retardant, a coupling agent, a defoaming agent and a plasticizer, and the weight ratio of the flame retardant, the coupling agent, the defoaming agent and the plasticizer of the first mixing aid is 100: 8: 2: 90, respectively; and the second mixing auxiliary agent in the component B comprises a flame retardant and a plasticizer, and the weight ratio of the flame retardant to the plasticizer of the second mixing auxiliary agent is 3: 4.
6. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 5, wherein the flame retardant in the first mixing aid and the second mixing aid is halogen-free phosphate.
7. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 5, wherein the plasticizer in the first mixing aid and the second mixing aid is polyester plasticizer.
8. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 5, wherein the defoaming agent is an organic silicon defoaming agent.
9. The environment-friendly high-performance polyurethane pouring sealant as claimed in claim 5, wherein the coupling agent is a silane coupling agent.
10. The preparation method of the environment-friendly high-performance polyurethane pouring sealant as claimed in any one of claims 1 to 9, characterized by comprising the following steps:
preparation of component A: weighing polyester polyol, castor oil and a first mixed assistant in a formula ratio, heating to 100 +/-10 ℃ under stirring, carrying out heat preservation reaction for 3 hours, and removing water and bubbles under vacuum conditions to obtain a component A;
preparation of the component B: weighing the liquefied MDI I, the liquefied MDI II, the liquefied MDI III and the mixed auxiliary agent II according to the formula ratio, and removing water and defoaming under the vacuum condition to obtain a component B;
when the polyurethane pouring sealant is used: stirring and mixing the component A and the component B according to the mass ratio of 1 (1-2).
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