CN107540808B - Long-life glass fiber composite board and preparation method thereof - Google Patents
Long-life glass fiber composite board and preparation method thereof Download PDFInfo
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- CN107540808B CN107540808B CN201710724271.5A CN201710724271A CN107540808B CN 107540808 B CN107540808 B CN 107540808B CN 201710724271 A CN201710724271 A CN 201710724271A CN 107540808 B CN107540808 B CN 107540808B
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Abstract
The invention belongs to the technical field of glass fiber composite material preparation, and provides a long-service-life glass fiber composite board and a preparation method thereof. The method comprises the steps of firstly obtaining anionic waterborne polyurethane emulsion under the protection of dry inert gas, preparing a polyurethane impregnating compound together with an auxiliary agent, then spraying the polyurethane impregnating compound on the surface of glass fiber, obtaining a composite material of the glass fiber and a polyurethane film after vacuum drying, finally superposing the composite material with a polytetrafluoroethylene plate, and obtaining the composite plate of the glass fiber and the polytetrafluoroethylene plate with good bonding performance and long service life after treatment. Compared with the traditional method, the obtained plate has good mechanical properties, is high-temperature resistant and corrosion resistant, has the service life of more than 10 years, increases the interface bonding of the glass fiber and the polytetrafluoroethylene, has high interface bonding strength, has simple preparation process, strong product quality controllability, low energy consumption and low production cost, and can realize large-scale industrial production.
Description
Technical Field
The invention belongs to the technical field of glass fiber composite material preparation, and provides a long-service-life glass fiber composite board and a preparation method thereof.
Background
The glass fiber is an excellent functional material and a structural material, and becomes an important composite reinforced new material for replacing traditional materials such as steel, wood, cement and the like. With the rapid development of market economy, glass fiber becomes an indispensable raw material for industries such as building, traffic, electronics, electrical, chemical industry, metallurgy, environmental protection, national defense and the like. Glass fibers are gaining increasing attention due to their widespread use in a number of areas. The major world for producing and consuming glass fiber is developed countries such as America, Europe, Japan, and the like, and the consumption of glass fiber by everyone is high.
The rapid development of the Chinese glass fiber industry in recent years is driven by the pull of two markets, namely domestic and foreign. The expansion of the international market not only has the factor of total demand increase, but also leaves development space for domestic enterprises in the international market after the international enterprises leave the industry in the early stage due to low profit margin; the growth of the domestic market is a rapid development from downstream consumer industries. Chinese glass fibers have been developed over 50 years and are already on a large scale. The glass fiber yield in China reaches 165 ten thousand tons in 2007, and the glass fiber industry yield in China is about 592.7 ten thousand tons in 2015, so that China becomes the first major country for glass fiber production in the world. In 2015, in the first half of the year, the number of glass fiber and product manufacturing industries in China is more than 752, and at present, the glass fiber industry is still the sunward industry keeping the growth vigor in the global range.
As a reinforcing material, the glass fiber has excellent performances of high strength, low flexibility, corrosion resistance, electrical insulation, difficult combustion and the like, but also has the defects of brittleness, poor wear resistance, poor processability and the like, so that the glass fiber impregnating compound is required to be subjected to targeted treatment, a layer of film forming substance can be coated on the surface i after the treatment, the processability is greatly improved, and a strong bonding effect can be generated. The plate material with the glass fiber matrix has heat insulating performance and is an excellent heat insulating material. In use, it is found that the performance of the ordinary glass fiber matrix plate is increasingly unable to meet the actual requirement, the polytetrafluoroethylene has better corrosion resistance and is usually coated on the surface of a metal member to form a corrosion-resistant layer, but the polytetrafluoroethylene plate has poorer bonding performance and is not easy to bond to the metal, therefore, the polytetrafluoroethylene plate is generally compounded with glass fiber cloth, so that the glass fiber cloth can be bonded to the metal relatively easily, but the polytetrafluoroethylene composite plate has the following defects: easy to break and damage and short in service life. Therefore, there is a need to design and develop a method for preparing a glass fiber-based thermal insulation material with a novel structure.
In order to solve the problem, a long-service-life glass fiber composite board and a preparation method thereof are provided. The glass fiber composite board is characterized in that the polyurethane material is sprayed on glass fibers to enable the glass fibers to be combined together in an organic mode, and then the glass fibers and a polytetrafluoroethylene board are combined into a whole through high-temperature and high-pressure hot melting, so that the glass fiber composite board is prepared.
Disclosure of Invention
The invention aims to provide a long-life glass fiber composite board and a preparation method thereof, the obtained board has good mechanical properties, is high-temperature resistant and corrosion resistant, has a service life of more than 10 years, is added with interface bonding of glass fiber and polytetrafluoroethylene, has high interface bonding strength, is simple in preparation process, strong in product quality controllability, low in energy consumption and low in production cost, and can realize large-scale industrial production.
The invention relates to a specific technical scheme as follows:
a long-life glass fiber composite board and a preparation method thereof are disclosed, firstly, under the protection of dry inert gas, anion water-based polyurethane emulsion is obtained, polyurethane impregnating compound is prepared together with auxiliary agent, then the polyurethane impregnating compound is sprayed on the surface of glass fiber, after vacuum drying, composite material of glass fiber and polyurethane film is obtained, finally, the composite material is superposed with polytetrafluoroethylene board, and after treatment, the composite board of glass fiber and polytetrafluoroethylene with good bonding performance and long service life is obtained, the concrete steps are as follows:
(1) under the protection of dry inert gas, adding polyester diol, castor oil and a catalyst into a reaction vessel in proportion, uniformly stirring and heating, then slowly dropwise adding corresponding amount of isophorone diisocyanate, then adding a hydrophilic chain extender and a cross-linking agent, and adding a certain amount of acetone to adjust viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 10-20 min, dispersing in deionized water at a high speed, adding ethylenediamine for chain extension, and stirring for 20-40 min to obtain an anionic waterborne polyurethane emulsion;
(2) and (2) preparing the polyurethane emulsion prepared in the step (1) and auxiliaries such as a coupling agent, a lubricating agent, a wetting agent, an antistatic agent and the like into the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, and placing the glass fiber and polyurethane film in a vacuum drying oven to obtain a composite material of the glass fiber and a polyurethane film;
(3) and (3) overlapping the composite material prepared in the step (2) with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature, pressurizing at constant temperature, keeping the pressure for 10-20 min after reaching the preset pressure, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
Preferably, the catalyst in the step (1) is dibutyl tin dilaurate, pentamethyl diethylenetriamine or dimethyl cyclohexylamine;
preferably, the hydrophilic chain extender in the step (1) is dimethylolpropionic acid or dihydroxy half ester;
preferably, the crosslinking agent in step (1) is trimethylolpropane, diethylenetriamine or dicumyl peroxide;
preferably, the adding amount of the castor oil in the step (1) is 5-8% of the mass of the polyester diol, and the adding amount of the catalyst is 0.5-1% of the mass of the polyester diol;
preferably, the adding amount of the hydrophilic chain extender in the step (1) is 2-7% of the mass of the polyester diol, and the adding amount of the cross-linking agent is 2-4% of the mass of the polyester diol;
preferably, the adding amount of the ethylenediamine in the step (1) is 50-80% of the total mass of the emulsion;
preferably, the coupling agent in the step (2) is a silane coupling agent, such as KH550, KH560 or KH570, and the addition amount of the silane coupling agent is 0.2-1.0% of the mass of the polyurethane emulsion;
preferably, the lubricant in the step (2) is silicone oil, fatty acid amide or oleic acid, and the addition amount of the lubricant is 0.1-0.3% of the mass of the polyurethane emulsion;
preferably, the wetting agent in the step (2) is polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether or polyoxyethylene polyoxypropylene block copolymer, and the addition amount of the wetting agent is 0.1-0.3% of the mass of the polyurethane emulsion;
preferably, the antistatic agent in the step (2) is ethoxylated fatty alkylamine, such as ethoxylated lauryl tyramine and glycerol-stearate, and the addition amount of the antistatic agent is 0.1-0.2% of the mass of the polyurethane emulsion;
preferably, during the vacuum drying in the step (2), drying for 4-5 hours at 60-65 ℃, and then drying for 2-3 hours after heating to 90-95 ℃;
preferably, in the step (3), the maximum temperature rise is 200-250 ℃, and the maximum pressurizing pressure is 40-60 MPa.
The long-life glass fiber composite board is characterized by being prepared by the method.
The method adopts isophorone diisocyanate and polyester diol as main raw materials, and synthesizes an anionic waterborne polyurethane emulsion through a prepolymer method, wherein the anionic waterborne polyurethane emulsion is used for being sprayed on the surface of glass fiber to enhance the interface bonding effect of the glass fiber and a polytetrafluoroethylene plate. The chain is extended by using the ethylenediamine, and because two active hydrogens on the chain extender can react with-NCO to form crosslinking to a certain degree, the improvement of water resistance and solvent resistance is facilitated. Due to the influence of ethylenediamine on the stability and appearance of the emulsion, it should be added dropwise after emulsification is complete. With the increase of-NCO content, urea bonds are increased, the crystallization capacity of hard segment micro-areas is enhanced, and the function of physical cross-linking points is achieved, so that the tensile strength of the material is improved, and the elongation at break is reduced. However, too much-NCO is liable to react with water, and is difficult to control, resulting in an emulsion having a large particle diameter and poor stability, and therefore, the amounts of isophorone diisocyanate and polyester diol should be controlled. The use of the hydrophilic chain extender can reduce the water resistance of the adhesive film, and the water resistance is reduced as much as possible on the premise of meeting the reaction requirement. The use of the castor oil can improve the strength of the material and reduce the water absorption, but can obviously reduce the toughness of the material, and the dosage of the castor oil should be effectively controlled. In the whole preparation process, the preparation process of the anionic waterborne polyurethane emulsion is particularly important, and the quality of the anionic waterborne polyurethane emulsion is directly related to the spraying effect and the pressing bonding strength of the glass fiber and the polytetrafluoroethylene plate, so that the anionic waterborne polyurethane emulsion has important influences on the interface strength, the mechanical property, the temperature resistance, the corrosion resistance and the service life of the obtained composite material.
Compared with the prior art, the invention provides a long-life glass fiber composite board and a preparation method thereof, and the outstanding characteristics and excellent effects are as follows:
1. the composite board of the glass fiber and the polytetrafluoroethylene prepared by the invention has good mechanical properties, high temperature resistance, corrosion resistance and long service life of more than 10 years.
2. According to the invention, the self-made anionic waterborne polyurethane emulsion is sprayed on the surface of the glass fiber to form a film structure, so that the interface bonding between the glass fiber and the polytetrafluoroethylene is increased, and the interface bonding strength is high.
3. The method has the advantages of simple preparation process, high controllability of product quality, low energy consumption and low production cost, and can realize large-scale industrial production.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.5kg of castor oil and 0.1kg of dibutyl tin dilaurate are added into a reaction vessel according to a certain proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.5kg of dimethylolpropionic acid and 0.3kg of diethylenetriamine are added, and a certain amount of acetone is added to adjust viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 15min, then dispersing in deionized water at a high speed, adding 12kg of ethylenediamine for chain extension, and stirring for 30min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with auxiliaries such as 0.25kg KH550, 0.06kg fatty acid amide, 0.06kg polyoxyethylene alkylphenol ether, 0.04kg ethoxy lauryl tyramine and the like to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 65 ℃ for 5 hours, and then heating to 90 ℃ for drying for 2 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 250 ℃, pressurizing at constant temperature, keeping the pressure for 20min after the pressure reaches 40MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 1 were tested, and the obtained tensile strength, elongation at break and flexural modulus are shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 1 was measured, and the obtained data are shown in table 1.
Example 2
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.7kg of castor oil and 0.06kg of pentamethyldiethylenetriamine are added into a reaction vessel according to the proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.5kg of dihydroxy half-ester and 0.4kg of trimethylolpropane are added, and a certain amount of acetone is added to adjust the viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 20min, then dispersing in deionized water at a high speed, adding 14kg of ethylenediamine for chain extension, and stirring for 40min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with 0.28kg KH570, 0.07kg silicone oil, 0.07kg polyoxyethylene fatty alcohol ether, 0.04kg glycerol-stearate and other additives to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 65 ℃ for 4 hours, and then heating to 90 ℃ for drying for 3 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 220 ℃, pressurizing at constant temperature, keeping the pressure for 15min after the pressure reaches 45MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 2 were tested, and the obtained tensile strength, elongation at break and flexural modulus are shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 2 was measured, and the obtained data are shown in table 1.
Example 3
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.8kg of castor oil and 0.08kg of pentamethyldiethylenetriamine are added into a reaction vessel according to a proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.6kg of dihydroxy half-ester and 0.2kg of trimethylolpropane are added, and a certain amount of acetone is added to adjust the viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 15min, then dispersing in deionized water at a high speed, adding 10kg of ethylenediamine for chain extension, and stirring for 30min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with auxiliaries such as 0.15kg KH560, 0.06kg fatty acid amide, 0.06kg polyoxyethylene fatty alcohol ether, 0.04kg ethoxy lauryl tyramine and the like to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 65 ℃ for 4 hours, and then heating to 90 ℃ to dry the glass fiber for 2.5 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 250 ℃, pressurizing at constant temperature, keeping the pressure for 10min after the pressure reaches 60MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 3 were tested, and the obtained tensile strength, elongation at break and flexural modulus were as shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 3 was measured, and the obtained data are shown in table 1.
Example 4
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.5kg of castor oil and 0.05kg of dibutyl tin dilaurate are added into a reaction vessel in proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.7kg of dimethylolpropionic acid and 0.3kg of dicumyl peroxide are added, and a certain amount of acetone is added to adjust viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 10min, then dispersing in deionized water at a high speed, adding 16kg of ethylenediamine for chain extension, and stirring for 40min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with 0.3kg KH570, 0.07kg oleic acid, 0.05kg polyoxyethylene polyoxypropylene block copolymer, 0.05kg ethoxy lauryl tyramine and other additives to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 60 ℃ for 5 hours, and then heating to 90 ℃ for drying for 3 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 250 ℃, pressurizing at constant temperature, keeping the pressure for 15min after the pressure reaches 50MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 4 were tested, and the obtained tensile strength, elongation at break and flexural modulus are shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 4 was measured, and the obtained data are shown in table 1.
Example 5
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.5kg of castor oil and 0.09kg of dimethylcyclohexylamine are added into a reaction vessel according to the proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.4kg of dihydroxy half ester and 0.4kg of diethylenetriamine are added, and a certain amount of acetone is added to adjust the viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 15min, then dispersing in deionized water at a high speed, adding 12kg of ethylenediamine for chain extension, and stirring for 30min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with 0.35kg KH550, 0.06kg silicone oil, 0.07kg polyoxyethylene alkylphenol ether, 0.05kg glycerol-stearate and other auxiliary agents to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 60 ℃ for 5 hours, and then heating to 95 ℃ and drying the glass fiber for 2 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 230 ℃, pressurizing at constant temperature, keeping the pressure for 10min after the pressure reaches 60MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 5 were tested, and the obtained tensile strength, elongation at break and flexural modulus were as shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 5 was measured, and the obtained data are shown in table 1.
Example 6
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.8kg of castor oil and 0.07kg of dibutyl tin dilaurate are added into a reaction vessel according to a certain proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.5kg of dimethylolpropionic acid and 0.3kg of trimethylolpropane are added, and a certain amount of acetone is added to adjust viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 20min, then dispersing in deionized water at a high speed, adding 14kg of ethylenediamine for chain extension, and stirring for 20min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with auxiliaries such as 0.4kg KH550, 0.08kg fatty acid amide, 0.07kg polyoxyethylene fatty alcohol ether and 0.05kg ethoxy lauryl tyramine to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 60 ℃ for 4.5 hours, and then heating to 90 ℃ for drying for 2.5 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 200 ℃, pressurizing at constant temperature, keeping the pressure for 15min after the pressure reaches 40MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 6 were tested, and the obtained tensile strength, elongation at break and flexural modulus were as shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 6 was measured, and the obtained data are shown in table 1.
Example 7
A long-life glass fiber composite board and a preparation method thereof are disclosed, wherein the specific process for preparing the composite board is as follows:
under the protection of dry inert gas, 10kg of polyester diol, 0.7kg of castor oil and 0.1kg of dimethylcyclohexylamine are added into a reaction vessel according to a proportion, stirred uniformly and heated, then a corresponding amount of isophorone diisocyanate is slowly dripped, then 0.5kg of dimethylolpropionic acid and 0.4kg of dicumyl peroxide are added, and a certain amount of acetone is added to adjust the viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 10min, then dispersing in deionized water at a high speed, adding 16kg of ethylenediamine for chain extension, and stirring for 40min to obtain an anionic waterborne polyurethane emulsion; the polyurethane emulsion is mixed with 0.5kg KH560, 0.07kg oleic acid, 0.07kg polyoxyethylene alkylphenol ether, 0.06kg glycerol-stearate and other auxiliary agents to prepare the polyurethane impregnating compound. Placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, placing the glass fiber in a vacuum drying oven, drying the glass fiber at 65 ℃ for 4 hours, and then heating to 90 ℃ for drying for 3 hours to obtain a composite material of the glass fiber and the polyurethane film; and overlapping the prepared composite material with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature to 250 ℃, pressurizing at constant temperature, keeping the pressure for 20min after the pressure reaches 50MPa, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
The mechanical properties of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 7 were measured, and the obtained tensile strength, elongation at break and flexural modulus were as shown in table 1; the service life of the composite sheet of glass fiber and polytetrafluoroethylene obtained in example 7 was measured, and the obtained data are shown in table 1.
Table 1:
| DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION | Tensile Strength (MPa) | Elongation at Break (%) | Flexural modulus (MPa) | Service life (years) of industrial load-bearing plate |
| Example 1 | 49.5 | 258 | 870 | ≥3 |
| Example 2 | 58.6 | 262 | 846 | ≥3 |
| Example 3 | 51.7 | 255 | 855 | ≥3 |
| Example 4 | 50.3 | 269 | 848 | ≥3 |
| Example 5 | 59.7 | 254 | 842 | ≥3 |
| Example 6 | 58.8 | 267 | 837 | ≥3 |
| Example 7 | 58.9 | 252 | 865 | ≥3 |
As can be seen from table 1:
(1) the composite board of the glass fiber and the polytetrafluoroethylene prepared by the method has higher tensile strength, flexural modulus, elongation at break and excellent comprehensive mechanical properties.
(2) The composite board of the glass fiber and the polytetrafluoroethylene prepared by the method has longer service life.
Claims (7)
1. A preparation method of a long-life glass fiber composite board is characterized in that a polyurethane material is sprayed on glass fibers to enable the glass fibers and the glass fibers to be combined together in an organic mode, and then the polyurethane material and a polytetrafluoroethylene board are combined into a whole through high-temperature and high-pressure hot melting, so that the glass fiber and polytetrafluoroethylene composite board which is good in bonding performance and long in service life is prepared; the preparation method comprises the following specific steps:
(1) under the protection of dry inert gas, adding polyester diol, castor oil and a catalyst into a reaction vessel in proportion, uniformly stirring and heating, then slowly dropwise adding corresponding amount of isophorone diisocyanate, then adding a hydrophilic chain extender and a cross-linking agent, and adding a certain amount of acetone to adjust viscosity. After the reaction is finished, reducing the temperature, adding triethylamine to adjust the pH value, stirring for 10-20 min, dispersing in deionized water at a high speed, adding ethylenediamine for chain extension, and stirring for 20-40 min to obtain an anionic waterborne polyurethane emulsion;
(2) preparing the polyurethane emulsion prepared in the step (1), a coupling agent, a lubricant, a wetting agent and an antistatic agent into a polyurethane impregnating compound; placing glass fiber on a horizontal table, spraying a polyurethane impregnating compound on the surface of the glass fiber, uniformly distributing and thickness, naturally drying the glass fiber at room temperature, and placing the glass fiber and polyurethane film in a vacuum drying oven to obtain a composite material of the glass fiber and a polyurethane film;
(3) and (3) overlapping the composite material prepared in the step (2) with a polytetrafluoroethylene plate, enabling a polyurethane film to be in close contact with the polytetrafluoroethylene plate, slowly raising the temperature, pressurizing at constant temperature, keeping the pressure for 10-20 min after reaching the preset pressure, and slowly releasing the pressure to obtain the glass fiber and polytetrafluoroethylene composite plate with good bonding performance and long service life.
2. The method for preparing a long-life glass fiber composite board according to claim 1, wherein the method comprises the following steps: the catalyst in the step (1) is dibutyl tin dilaurate, pentamethyl diethylenetriamine or dimethyl cyclohexylamine; the hydrophilic chain extender is dimethylolpropionic acid or dihydroxy half ester; the cross-linking agent is trimethylolpropane, diethylenetriamine or dicumyl peroxide.
3. The method for preparing a long-life glass fiber composite board according to claim 1, wherein the method comprises the following steps: the adding amount of the castor oil in the step (1) is 5-8% of the mass of the polyester diol; the adding amount of the catalyst is 0.5-1% of the mass of the polyester dihydric alcohol; the addition amount of the hydrophilic chain extender is 2-7% of the mass of the polyester diol; the addition amount of the cross-linking agent is 2-4% of the mass of the polyester diol; the addition amount of the ethylenediamine is 50-80% of the total mass of the emulsion.
4. The method for preparing a long-life glass fiber composite board according to claim 1, wherein the method comprises the following steps: the coupling agent in the step (2) is KH550, KH560 or KH570, and the addition amount is 0.2-1.0% of the mass of the polyurethane emulsion; the lubricant is silicone oil, fatty acid amide or oleic acid, and the addition amount of the lubricant is 0.1-0.3% of the mass of the polyurethane emulsion; the wetting agent is polyoxyethylene alkylphenol ether, polyoxyethylene fatty alcohol ether or polyoxyethylene polyoxypropylene segmented copolymer, and the addition amount of the wetting agent is 0.1-0.3% of the mass of the polyurethane emulsion; the antistatic agent is ethoxy lauryl tyramine or glycerol-stearate, and the addition amount of the antistatic agent is 0.1-0.2% of the mass of the polyurethane emulsion.
5. The method for preparing a long-life glass fiber composite board according to claim 1, wherein the method comprises the following steps: and (3) during vacuum drying in the step (2), drying for 4-5 hours at the temperature of 60-65 ℃, and then heating to the temperature of 90-95 ℃ for drying for 2-3 hours.
6. The method for preparing a long-life glass fiber composite board according to claim 1, wherein the method comprises the following steps: and (3) the highest temperature rise temperature is 250 ℃, and the highest pressurizing pressure is 60 MPa.
7. The long-life glass fiber composite board is characterized in that: prepared by the process of any one of claims 1 to 6.
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| CN110626020B (en) * | 2019-08-06 | 2021-12-14 | 衢州艾科科技有限公司 | Polyurethane reinforced composite material and preparation method thereof |
| CN114075397A (en) * | 2020-08-12 | 2022-02-22 | 江苏山由帝奥节能新材股份有限公司 | High-temperature-resistant water-based paint and furnace door liner applying same |
| CN112724847B (en) * | 2020-12-14 | 2023-03-31 | 苏州市雄林新材料科技有限公司 | High-low temperature composite film and preparation method thereof |
| CN114179400B (en) * | 2021-12-15 | 2024-03-29 | 苏州市华研富士新材料有限公司 | High-strength high-temperature-resistant glass fiber composite board production device and technology |
| CN115304736A (en) * | 2022-08-09 | 2022-11-08 | 盛鼎高新材料有限公司 | Polyurethane elastomer with hydrolytic stability and preparation method thereof |
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Effective date of registration: 20200511 Address after: Li Cun Zhen Bai Miao Cun, Mudan District, Heze City, Shandong Province Patentee after: Heze Haoyuan energy conservation and Environmental Protection Technology Co.,Ltd. Address before: Qingyang District of Chengdu City, Sichuan province 610091 Dragon Industrial Port East Road 4 Patentee before: CHENDU NEW KELI CHEMICAL SCIENCE Co.,Ltd. CHINA |
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