CN114957608B - Polyurethane adhesive applied to conveyer belt buckle protection and preparation method thereof - Google Patents

Polyurethane adhesive applied to conveyer belt buckle protection and preparation method thereof Download PDF

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Publication number
CN114957608B
CN114957608B CN202210680900.XA CN202210680900A CN114957608B CN 114957608 B CN114957608 B CN 114957608B CN 202210680900 A CN202210680900 A CN 202210680900A CN 114957608 B CN114957608 B CN 114957608B
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component
parts
preparing
polyurethane adhesive
conveyer belt
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CN114957608A (en
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刘滨
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Beijing Comens New Materials Co Ltd
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Beijing Comens New Materials 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
    • C08G18/70—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
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
    • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
    • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
    • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
    • 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
    • C08G18/4812—Mixtures of polyetherdiols with polyetherpolyols having at least three hydroxy groups
    • 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
    • C08G18/4825—Polyethers containing two hydroxy groups
    • 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
    • C08G18/4829—Polyethers containing at least three hydroxy groups
    • 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
    • C08G18/4854—Polyethers containing oxyalkylene groups having four carbon atoms in the alkylene group
    • 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
    • C08G18/6603—Compounds of groups C08G18/42, C08G18/48, or C08G18/52 with compounds of group C08G18/32 or polyamines of C08G18/38
    • C08G18/6607—Compounds of groups C08G18/42, 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
    • C08G18/70—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
    • C08G18/722—Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
    • 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
    • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
    • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
    • C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • 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
    • C09J175/04—Polyurethanes
    • C09J175/08—Polyurethanes from polyethers

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  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
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  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Adhesives Or Adhesive Processes (AREA)

Abstract

The invention discloses a polyurethane adhesive applied to conveyer belt buckle protection and a preparation method thereof, wherein 20-30 parts of polyether polyol, 30-50 parts of chain extender, 20-30 parts of plasticizer, 0.1-0.5 part of defoamer, 1-3 parts of color paste, 0.5-2 parts of organosilicon coupling agent and 0.001-0.01 part of catalyst are mixed to prepare a first component; 50-60 parts of polyether polyol and 5-15 parts of polyethylene glycol are added into a reaction kettle, the temperature is raised to 110 ℃ to dehydrate until the water content is lower than 200ppm, the temperature is reduced to below 50 ℃, 40-55 parts of diisocyanate is added, the temperature is raised to 70-80 ℃ again, and the reaction is carried out for 3 hours, so that a second component is prepared; and mixing the first component and the second component according to a specific proportion to obtain the polyurethane adhesive. The invention has the advantages of high curing speed, high bonding strength, good transparency, yellowing resistance, no bubbles and the like, is suitable for protecting the conveyer belt buckle, and prolongs the service life of the conveyer belt.

Description

Polyurethane adhesive applied to conveyer belt buckle protection and preparation method thereof
Technical Field
The invention relates to the technical field of polyurethane adhesives, in particular to a polyurethane adhesive applied to conveyer belt buckle protection and a preparation method thereof.
Background
With the rapid development of society, the industrial productivity is continuously improved, the energy demand is continuously increased, so that the workload of a coal mine transportation system is increased, and the coal mine transportation system generally adopts a conveyer belt. The conveyor belt needs to be connected in a multistage mode to form the required length, and the specific conveyor belt connecting method is that conveyor belt buckles are firstly arranged at the ends of the conveyor belt, and then every two sections of conveyor belts are connected into a whole through the conveyor belt buckles. However, when the conveyer belt buckle connected with the conveyer belt in the prior art is subjected to the action of external force in use, the risk of tripping is easy to generate, so that the normal production process of the conveyer belt can be influenced, and the conveyer belt buckle is easy to fall off to bring potential safety hazards, thereby forming danger to personal safety.
The use of the conveyer belt buckle directly relates to the service life, maintenance efficiency and the like of the coal mine conveyer belt, so that a conveyer belt manufacturing enterprise designs a plurality of conveyer belt buckles for prolonging the service life of the conveyer belt, and adopts an adhesive coating method to protect the conveyer belt buckle.
At present, the adhesive specially used for protecting the conveyer belt buckle in the market is not common, most of the adhesives are adhesives with other purposes, but the adhesives generally have the defects of containing organic solvents, being not environment-friendly, being low in strength and the like, so that the conveyer belt buckle protecting adhesive with the characteristics of environment friendliness, high curing speed, high bonding strength, yellowing resistance and the like is urgently required to be developed, and the adhesive can be qualified and can be used for protecting the conveyer belt buckle.
In view of this, the present invention has been made.
Disclosure of Invention
The invention aims to provide a polyurethane adhesive applied to belt buckle protection of a conveying belt and a preparation method thereof, so as to solve the technical problems in the prior art. The invention has the advantages of high curing speed, high bonding strength, good adhesion to a base material, high mechanical strength, good transparency, yellowing resistance, no bubbles and the like, and various performance parameters are matched with the protection conveyer belt buckle, so that the invention can be used for protecting the buckle part of the conveyer belt and prolonging the service life of the conveyer belt.
The invention aims at realizing the following technical scheme:
a preparation method of polyurethane adhesive applied to conveyer belt buckle protection comprises the following steps:
(1) The preparation of the first component: according to the mass parts, 20-30 parts of polyether polyol, 30-50 parts of chain extender, 20-30 parts of plasticizer, 0.1-0.5 part of defoamer, 1-3 parts of color paste, 0.5-2 parts of organosilicon coupling agent and 0.001-0.01 part of catalyst are mixed together, so that a first component is prepared;
(2) A step of preparing a second component: adding 50-60 parts of polyether polyol and 5-15 parts of polyethylene glycol into a synthesis reaction kettle according to parts by mass, heating to 110 ℃, dehydrating at a high temperature until the water content is lower than 200ppm, cooling to below 50 ℃, adding 40-55 parts of diisocyanate, heating to 70-80 ℃, and reacting for 3 hours, wherein the synthesis reaction is completed, and obtaining a polyurethane prepolymer, namely a second component;
(3) And (3) compounding: and mixing the first component with the second component according to the mass ratio of the first component to the second component=100:50-60, so as to prepare the polyurethane adhesive applied to the buckle protection of the conveying belt.
Preferably, in the step of preparing the second component, the diisocyanate is at least one of isophorone diisocyanate and 4,4' -dicyclohexylmethane diisocyanate.
Preferably, in the step of preparing the second component, the polyether polyol adopts at least one of a difunctional polyether polyol having a molecular weight of 1000 to 2000 or a difunctional polytetrahydrofuran diol having a molecular weight of 1000 to 2000.
Preferably, in the step of preparing the second component, the polyethylene glycol has a molecular weight of 400 to 1000.
Preferably, in the step of preparing the first component, the polyether polyol is a trifunctional polyether polyol having a molecular weight of 3000 to 4000.
Preferably, in the step of preparing the first component, the chain extender adopts at least one of 4,4' -methylenebis (2-ethyl) aniline, tetrahydroxypropylethylenediamine, and m-xylylenediamine.
Preferably, in the step of preparing the first component, any one of AFCONA-7201 and BYK-A530 is used as the antifoaming agent.
Preferably, in the step of preparing the first component, the silicone coupling agent employs gamma-glycidoxypropyl trimethoxysilane.
Preferably, in the step of preparing the first component, the plasticizer is any one of dioctyl adipate, didecyl phthalate, diisononyl phthalate; the catalyst adopts any one of dibutyl tin dilaurate and DBU derivative catalyst.
The polyurethane adhesive for protecting the conveyer belt buckle is prepared by the preparation method of the polyurethane adhesive for protecting the conveyer belt buckle.
Compared with the prior art, the polyurethane adhesive with the excellent characteristics of high curing speed, high bonding strength, good adhesion to a base material, high mechanical strength, good transparency, yellowing resistance, difficult foaming and the like is prepared by mixing polyether polyol, a chain extender, a plasticizer, a defoaming agent, color paste, an organosilicon coupling agent and a catalyst to prepare a first component, preparing a second component by adopting the polyether polyol, the polyethylene glycol and diisocyanate with the special proportions according to a special preparation method, mixing and compounding the first component and the second component according to the special proportions, and preparing the polyurethane adhesive with the excellent characteristics of high curing speed, high bonding strength, good transparency, yellowing resistance, difficult foaming and the like, wherein all performance parameters meet the requirements of protecting a conveyer belt buckle, and the polyurethane adhesive can be used as a qualified conveyer belt buckle protecting adhesive for protecting a conveyer belt buckle part, and prolonging the service life of the conveyer belt;
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely described below; it will be apparent that the described embodiments are only some embodiments of the invention, but not all embodiments, which do not constitute limitations of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to fall within the scope of the invention.
The terms that may be used herein will first be described as follows:
The terms "comprises," "comprising," "includes," "including," "has," "having" or other similar referents are to be construed to cover a non-exclusive inclusion. For example: including a particular feature (e.g., a starting material, component, ingredient, carrier, formulation, material, dimension, part, means, mechanism, apparatus, step, procedure, method, reaction condition, processing condition, parameter, algorithm, signal, data, product or article of manufacture, etc.), should be construed as including not only a particular feature but also other features known in the art that are not explicitly recited.
The term "parts by mass" means a mass ratio relationship between a plurality of components, for example: if the X component is described as X parts by mass and the Y component is described as Y parts by mass, the mass ratio of the X component to the Y component is expressed as x:y;1 part by mass may represent any mass, for example: 1 part by mass may be 1kg or 3.1415926 kg. The sum of the mass parts of all the components is not necessarily 100 parts, and may be more than 100 parts, less than 100 parts, or 100 parts or equal. The parts, proportions and percentages described herein are by mass unless otherwise indicated.
When concentrations, temperatures, pressures, dimensions, or other parameters are expressed as a range of values, the range is to be understood as specifically disclosing all ranges formed from any pair of upper and lower values within the range of values, regardless of whether ranges are explicitly recited; for example, if a numerical range of "2 to 8" is recited, that numerical range should be interpreted to include the ranges of "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5to 7", and the like. Unless otherwise indicated, numerical ranges recited herein include both their endpoints and all integers and fractions within the numerical range.
The polyurethane adhesive applied to the protection of the conveyer belt buckle and the preparation method thereof are described in detail below. What is not described in detail in the embodiments of the present invention belongs to the prior art known to those skilled in the art. The specific conditions are not noted in the examples of the present invention and are carried out according to the conditions conventional in the art or suggested by the manufacturer. The reagents or apparatus used in the examples of the present invention were conventional products commercially available without the manufacturer's knowledge.
The invention provides a polyurethane adhesive applied to conveyer belt buckle protection, and the preparation method of the polyurethane adhesive can comprise the following steps:
(1) The preparation of the first component: according to the mass parts, 20 to 30 parts of polyether polyol, 30 to 50 parts of chain extender, 20 to 30 parts of plasticizer, 0.1 to 0.5 part of defoamer, 1 to 3 parts of color paste, 0.5 to 2 parts of organosilicon coupling agent and 0.001 to 0.01 part of catalyst are mixed together and uniformly dispersed, so as to prepare the first component. The first component is a homogenous fluid with the viscosity of 500-1500 mPa.s and consistent with the color of the color paste at the temperature of 25 ℃.
(2) A step of preparing a second component: 50-60 parts of polyether polyol and 5-15 parts of polyethylene glycol are added into a synthesis reaction kettle according to parts by mass, the temperature is raised to 110 ℃, the water is dehydrated at a high temperature until the water content is lower than 200ppm, the temperature is reduced to below 50 ℃, 40-55 parts of diisocyanate is added, the temperature is raised to 70-80 ℃ and the reaction is carried out for 3 hours, and the polyurethane prepolymer is obtained after the completion of the synthesis reaction, namely the second component. The second component is a transparent homogeneous fluid with a viscosity of 8000-12000 mPa.s at 25 ℃.
(3) And (3) compounding: and mixing the first component with the second component according to the mass ratio of the first component to the second component=100:50-60, so as to prepare the polyurethane adhesive applied to the buckle protection of the conveying belt.
Specifically, the polyurethane adhesive applied to the protection of the conveyer belt buckle can comprise the following embodiments:
(1) In the step of preparing the second component, the diisocyanate is preferably at least one of isophorone diisocyanate and 4,4' -dicyclohexylmethane diisocyanate.
(2) In the step of preparing the second component, the polyether polyol preferably employs at least one of a difunctional polyether polyol having a molecular weight of 1000 to 2000 or a difunctional polytetrahydrofuran diol having a molecular weight of 1000 to 2000.
(3) In the step of preparing the second component, the polyethylene glycol preferably has a molecular weight of 400 to 1000.
(4) In the step of preparing the first component, the polyether polyol is preferably a trifunctional polyether polyol having a molecular weight of 3000 to 4000.
(5) In the step of preparing the first component, the chain extender is preferably an amine-type chain extender, for example: the chain extender is preferably at least one of 4,4' -methylenebis (2-ethyl) aniline, tetrahydroxypropyl ethylenediamine, and m-xylylenediamine.
(6) In the step of preparing the first component, the antifoaming agent is preferably any one of the Epalferol AFCONA-7201 antifoaming agent and the Pick BYK-A530 antifoaming agent in the prior art.
(7) In the step of preparing the first component, the silicone coupling agent is preferably gamma-glycidoxypropyl trimethoxysilane.
(8) In the step of preparing the first component, the plasticizer is preferably any one of dioctyl adipate, didecyl phthalate, and diisononyl phthalate.
(9) The catalyst is preferably any one of dibutyl tin dilaurate and DBU derivative catalyst.
(10) The color paste can be blue color paste treated by polyether and plasticizer in the prior art or other color paste meeting the color required by customers.
Further, the polyurethane adhesive applied to the conveyer belt buckle protection and the preparation method thereof are developed according to the requirement of the conveyer belt buckle protection adhesive, and the polyurethane adhesive has the advantages of high curing speed, high bonding strength, good adhesive force to a base material, high mechanical strength, good transparency, yellowing resistance, no bubbles and the like, and the performance parameters meet the requirement of protecting the conveyer belt buckle, and can be used as qualified conveyer belt buckle protection adhesive for protecting the buckle part of the conveyer belt and prolonging the service life of the conveyer belt by selecting specific polyether polyol, matching different chain extenders, different polyethylene glycols and different diisocyanates according to specific proportions and adjusting the preparation method; the polyurethane adhesive prepared by the invention has the effects of high strength and yellowing resistance by adjusting the diisocyanate, and has good transparency by selecting specific polyethylene glycol; the polyurethane prepolymer fully prepolymerized in the invention can react with a specific chain extender and a specific polyether polyol to form macromolecules rapidly, so that the strength of the prepared polyurethane adhesive rises rapidly and bubbles are not easy to generate; the invention can further eliminate bubbles and pinholes of the prepared polyurethane adhesive by adopting a special defoaming agent, thereby ensuring that the polyurethane adhesive has good strength and appearance.
The adhesive in the prior art can not completely meet the performance requirement of the application field of protecting the conveyer belt buckle, and mainly has the following problems: (1) On the basis of meeting the solid content requirement, the requirement of peeling strength cannot be met, and bubbles are very many; (2) On the basis of meeting the operation time, the index requirement that the 1 hour hardness is more than 30D can not be met; (3) The two requirements of high strength and high elongation cannot be met; (4) the yellowing resistance requirement cannot be satisfied. Compared with the adhesive in the prior art, the performance parameters shown in the following table 1 can be achieved in the embodiment of the invention:
TABLE 1
According to the technical scheme of the invention, the technical scheme of the invention can be adopted to customize the product of the embodiment of the invention with proper reaction speed, color, strength and other performance requirements for the conveyor belt manufacturer according to the actual needs of the conveyor belt manufacturer.
In summary, the embodiment of the invention has the excellent characteristics of high curing speed, high bonding strength, good adhesion to a base material, high mechanical strength, good transparency, yellowing resistance, no bubbles and the like, and various performance parameters are matched with the protection conveyer belt buckle, so that the conveyer belt buckle can be used for protecting the buckle part of the conveyer belt and prolonging the service life of the conveyer belt.
In order to clearly show the technical scheme and the technical effects provided by the invention, the polyurethane adhesive applied to the protection of the conveyer belt buckle and the preparation method thereof provided by the embodiment of the invention are described in detail in the following by specific embodiments.
Example 1
The preparation method of the polyurethane adhesive for protecting the conveyer belt buckle comprises the following steps:
(1) The preparation of the first component: according to mass parts, 25 parts of polyether triol with molecular weight of 3500, 47 parts of 4,4' -methylenebis (2-ethyl) aniline, 25 parts of dioctyl adipate, 0.2 part of Pick BYK-A530 defoamer, 2 parts of color paste, 0.8 part of gamma-glycidoxypropyl trimethoxysilane and 0.001 part of dibutyltin dilaurate are mixed together and uniformly dispersed, so that a first component is prepared; the first component is a homogenous fluid with the viscosity of 650 mPa.s at the temperature of 25 ℃ and consistent with the color of the color paste.
(2) A step of preparing a second component: according to parts by mass, adding 24 parts of polyether glycol with the molecular weight of 2000, 30 parts of polytetrahydrofuran glycol with the molecular weight of 1000 and 6 parts of polyethylene glycol with the molecular weight of 400 into a synthesis reaction kettle, heating to 110 ℃, dehydrating at high temperature until the water content is lower than 200ppm, cooling to 50 ℃, adding 15 parts of 4,4' -dicyclohexylmethane diisocyanate and 25 parts of isophorone diisocyanate, heating to 70-80 ℃, reacting for 3 hours, and obtaining a polyurethane prepolymer when the viscosity is 9000 mPa.s at the temperature of 25 ℃, wherein the polyurethane prepolymer is obtained; the second component is a transparent homogeneous fluid having a viscosity of 9000 mPa-s at a temperature of 25 ℃.
(3) And (3) compounding: and mixing the first component with the second component according to the mass ratio of the first component to the second component=100:60, so as to prepare the polyurethane adhesive applied to conveyor belt buckle protection.
Example 2
The preparation method of the polyurethane adhesive for protecting the conveyer belt buckle comprises the following steps:
(1) The preparation of the first component: according to mass parts, 28 parts of polyether triol with molecular weight of 3500, 39 parts of tetrahydroxypropyl ethylenediamine, 5 parts of m-xylylenediamine, 25 parts of diisononyl phthalate, 0.2 part of Epfukuna AFCONA-7201 defoamer, 2 parts of color paste, 0.8 part of gamma-glycidoxypropyl trimethoxysilane and 0.003 part of catalyst dibutyl tin dilaurate are mixed together and uniformly dispersed, so that a first component is prepared; the first component is a homogenous fluid with the viscosity of 720 mPa.s at the temperature of 25 ℃ and consistent with the color of the color paste.
(2) A step of preparing a second component: according to parts by mass, 26 parts of polyether glycol with the molecular weight of 2000, 28 parts of polytetrahydrofuran glycol with the molecular weight of 1000 and 6 parts of polyethylene glycol with the molecular weight of 400 are added into a synthesis reaction kettle, the temperature is raised to 110 ℃, the water content is dehydrated to be lower than 200ppm at high temperature, the temperature is reduced to 50 ℃, 12 parts of 4,4' -dicyclohexylmethane diisocyanate and 28 parts of isophorone diisocyanate are added, the temperature is raised to 70-80 ℃, the reaction is carried out for 3 hours, and when the viscosity is 8000 mPa.s at the temperature of 25 ℃, the synthesis reaction is completed, and the polyurethane prepolymer is obtained, namely the second component; the second component is a transparent homogeneous fluid having a viscosity of 8000 mPa-s at a temperature of 25 ℃.
(3) And (3) compounding: and mixing the first component with the second component according to the mass ratio of the first component to the second component=100:55, so as to prepare the polyurethane adhesive applied to conveyor belt buckle protection.
Comparative example 1
A polyurethane adhesive which is a polyurethane adhesive product free of organic solvents, the first component being a mixture of polyol components; the second component is a product obtained by pre-polymerizing isocyanate; the preparation method comprises the following steps:
(1) The preparation of the first component: according to parts by mass, 45 parts of polyether triol with a molecular weight of 5000, 17 parts of 1,4 butanediol, 35 parts of dioctyl adipate, 0.2 part of Pick BYK-A530 defoamer, 2 parts of color paste, 0.8 part of gamma-glycidoxypropyl trimethoxysilane and 0.001 part of dibutyl tin dilaurate are mixed together and uniformly dispersed, so that a first component is prepared; the first component is a homogenous fluid with the viscosity of 850 mPa.s at the temperature of 25 ℃ and consistent with the color of the color paste.
(2) A step of preparing a second component: according to parts by mass, adding 24 parts of polyether glycol with the molecular weight of 2000, 30 parts of polytetrahydrofuran glycol with the molecular weight of 1000 and 6 parts of polyethylene glycol with the molecular weight of 800 into a synthesis reaction kettle, heating to 110 ℃, dehydrating at high temperature until the water content is lower than 200ppm, cooling to 50 ℃, adding 15 parts of diphenylmethane diisocyanate and 25 parts of isophorone diisocyanate, heating to 70-80 ℃, reacting for 3 hours, and finishing the synthesis reaction when the viscosity is 6000 mPa.s at 25 ℃ is measured, thus obtaining a polyurethane prepolymer, namely a second component; the second component is a transparent homogeneous fluid having a viscosity of 6000 mPa-s at a temperature of 25 ℃.
(3) And (3) compounding: the first component and the second component are mixed according to the mass ratio of the first component to the second component=100:60, so that the mixture can be used.
Comparative example 2
A polyurethane adhesive is Beijing Tao Xi TX-2015 two-component polyurethane adhesive which is commercially available in the prior art.
Performance detection
The following performance tests were carried out on the polyurethane adhesive for conveyor belt buckle protection prepared in example 1 of the present invention and the polyurethane adhesives in comparative examples 1 and 2:
the test results are shown in table 1 below:
TABLE 1
As can be seen from inventive example 1, comparative example 2 and table 1 above: in the embodiment 1 of the invention, 1,4 butanediol serving as a chain extender in the comparative example 1 is mainly changed into amine chain extender 4,4 '-methylenebis (2-ethyl) aniline, diphenylmethane diisocyanate in the comparative example 1 is changed into 4,4' -dicyclohexylmethane diisocyanate, and the dosage proportion of several main raw materials such as polyether triol is adjusted, so that the performance of the embodiment 1 of the invention in the aspect of curing speed is greatly improved, the time for reaching 30D in hardness is greatly shortened, bubbles are greatly reduced, and the yellowing resistance is remarkably improved. The polyurethane adhesive of the proportion 1 and the comparative example 2 can not completely meet the performance requirement of the application field of protecting the conveyer belt buckle, and can not solve the technical problems of quick solidification, air bubble, yellowing and the like; in the embodiment 1 of the invention, the raw material formula and the preparation method are adjusted, the high-efficiency amine chain extender is creatively adopted, so that the molecular chain can be rapidly increased, the hardness can be rapidly improved, the 4,4' -dicyclohexylmethane diisocyanate and isophorone diisocyanate are matched for high-degree prepolymerization, and meanwhile, the high-purity epoxy resin is matched with specific polyether polyol and specific polyethylene glycol according to a specific proportion, so that the yellowing resistance, the bulk strength, the tensile strength and the peeling strength are high, and the flexibility is good.
In summary, the embodiment of the invention has the excellent characteristics of high curing speed, high bonding strength, good adhesion to a base material, high mechanical strength, good transparency, yellowing resistance, no bubbles and the like, and various performance parameters are matched with the protection conveyer belt buckle, so that the conveyer belt buckle can be used for protecting the buckle part of the conveyer belt and prolonging the service life of the conveyer belt.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the scope of the present invention should be included in the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims. The information disclosed in the background section herein is only for enhancement of understanding of the general background of the invention and is not to be taken as an admission or any form of suggestion that this information forms the prior art already known to those of ordinary skill in the art.

Claims (6)

1. The preparation method of the polyurethane adhesive applied to the protection of the conveyer belt buckle is characterized by comprising the following steps:
(1) The preparation of the first component: according to the mass parts, 20-30 parts of polyether polyol, 30-50 parts of chain extender, 20-30 parts of plasticizer, 0.1-0.5 part of defoamer, 1-3 parts of color paste, 0.5-2 parts of organosilicon coupling agent and 0.001-0.01 part of catalyst are mixed together, so that a first component is prepared;
in the step of preparing the first component, the polyether polyol adopts trifunctional polyether polyol with a molecular weight of 3000-4000;
in the step of preparing the first component, the chain extender adopts at least one of 4,4' -methylenebis (2-ethyl) aniline, tetrahydroxypropyl ethylenediamine and m-xylylenediamine;
(2) A step of preparing a second component: adding 50-60 parts of polyether polyol and 5-15 parts of polyethylene glycol into a synthesis reaction kettle according to parts by mass, heating to 110 ℃, dehydrating at a high temperature until the water content is lower than 200ppm, cooling to below 50 ℃, adding 40-55 parts of diisocyanate, heating to 70-80 ℃, and reacting for 3 hours, wherein the synthesis reaction is completed, and obtaining a polyurethane prepolymer, namely a second component;
in the step of preparing the second component, the polyether polyol adopts difunctional polytetrahydrofuran glycol with a molecular weight of 1000-2000;
In the step of preparing the second component, isophorone diisocyanate, 4' -dicyclohexylmethane diisocyanate is used as the diisocyanate;
(3) And (3) compounding: and mixing the first component with the second component according to the mass ratio of the first component to the second component=100:50-60, so as to prepare the polyurethane adhesive applied to the buckle protection of the conveying belt.
2. The method for preparing a polyurethane adhesive for conveyor belt buckle protection of claim 1, wherein in the step of preparing the second component, the molecular weight of the polyethylene glycol is 400-1000.
3. The method for preparing a polyurethane adhesive for conveyor belt buckle protection according to claim 1, wherein in the step of preparing the first component, any one of AFCONA-7201 and BYK-a530 is used as the defoaming agent.
4. The method for preparing a polyurethane adhesive for conveyor belt buckle protection as claimed in claim 1, wherein in the step of preparing the first component, the silicone coupling agent adopts gamma-glycidoxypropyl trimethoxysilane.
5. The method for preparing a polyurethane adhesive for conveyor belt buckle protection according to claim 1, wherein in the step of preparing the first component, the plasticizer is any one of dioctyl adipate, didecyl phthalate, diisononyl phthalate; the catalyst adopts any one of dibutyl tin dilaurate and DBU derivative catalyst.
6. A polyurethane adhesive for conveyer belt buckle protection, which is characterized by being prepared by adopting the preparation method of the polyurethane adhesive for conveyer belt buckle protection as claimed in any one of claims 1 to 5.
CN202210680900.XA 2022-06-16 2022-06-16 Polyurethane adhesive applied to conveyer belt buckle protection and preparation method thereof Active CN114957608B (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112011304A (en) * 2020-07-30 2020-12-01 陆志奇 Polyurethane elastomer glue for repairing conveyor belt and preparation process thereof

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112011304A (en) * 2020-07-30 2020-12-01 陆志奇 Polyurethane elastomer glue for repairing conveyor belt and preparation process thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
游敏 等.《金属结构胶接》.武汉水利电力大学出版社,2000,(第1版),第13页. *

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