A kind of high temperature resistant polyurethane rubber modified by silaborazane and preparation method thereof
A technology of polyurethane rubber and silaborazane, which is applied in the field of polyurethane rubber manufacturing and high-temperature heat protection, can solve the problems of reduced flexibility, mechanical properties and anti-aging performance, and cannot meet the needs of ultra-high temperature heat protection, and achieve heat resistance performance Improved effect
Active Publication Date: 2022-05-24
BEIJING INST OF ASTRONAUTICAL SYST ENG +1
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Problems solved by technology
However, at present, with the gradual improvement of aerospace thermal conditions, the existing polyurethane rubber can no longer meet the actual instantaneous ultra-high temperature heat protection requirements
For this reason, it is necessary to further improve the high temperature resistance of polyurethane rubber. The usual strategy is to add more inorganic fillers. However, with the increase of inorganic fillers, the flexibility, mechanical properties and aging resistance of polyurethane rubber at room temperature will be significantly reduced. For this reason , it is necessary to find a more effective method to improve the high temperature heat resistance of polyurethane without reducing many properties at room temperature
Method used
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[0028] The first step: a certain proportion of inorganic fillers: 10 parts of micron sodium silicate, 10 parts of micron calcium carbonate, 10 parts of micron ammonium borate, put in a planetary mill, the speed is 200 rpm, and the ball mill is 400 minutes to obtain an inorganic filler mixture ;
[0029] The second step: add 20 parts of silaborazane to 50 parts of polyurethane rubber AU1110, and the mechanical stirring speed is 120 rpm, and after stirring for 60 minutes, it becomes a uniform rubber mixture;
[0030] The third step: add the inorganic filler mixture obtained in the first step to the rubber mixture in the second step, then add 1 part of dibutyltin dilaurate as a catalyst, and then the mechanical stirring speed is 300 rpm, and after 10 minutes of stirring, it becomes uniform rubber compound;
[0031] The fourth step: paint the rubber mixture into the mold, and put it into a heating furnace at 80°C for 30 minutes to obtain a flexible rubber sheet with a thickness o...
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The invention relates to a silaborazane-modified high-temperature-resistant polyurethane rubber and a preparation method thereof, which belong to the technical field of polyurethane rubber manufacturing and also belong to the technical field of high-temperature thermal protection. Compared with rubber A, the tensile strength and tear strength of rubber B have increased by 45% and 61% respectively, and the anti-aging performance of rubber B has improved by 29%; Rubber tensile strength of the present invention and tear strength have improved 154% respectively % and 173%, the anti-aging properties of the rubber of the present invention have improved by 133%, and the high-temperature heat-resistant properties, the backside temperature rise of rubber A after irradiation is 390 ° C, and the back side temperature rise of rubber B is 201 ° C after irradiation (heat-proof performance Increased by 48%), the back surface temperature rise of the rubber of the present invention after irradiation is 12° C. (the heat resistance performance has been improved by 97%), which shows that the rubber heat protection performance of the present invention is significantly improved.
Description
technical field [0001] The invention relates to a high temperature resistant polyurethane rubber modified by silaborazane and a preparation method thereof, belonging to the technical field of polyurethane rubber manufacturing and also to the technical field of high temperature thermal protection. High temperature resistant rubber above 150℃. Background technique [0002] In the aerospace field, flexible polyurethane rubber is usually used as a thermal protection material in some thermal conditions. Polyurethane rubber is a series of elastomer materials containing more urethane groups on the polymer main chain, which is actually polyurethane rubber, referred to as polyurethane rubber or urethane rubber or polyurethane elastomer. It consists of oligomer polyol and organic polyisocyanate to form the main body of polyurethane rubber, diamine or diol and small molecular polyamine or polyol, etc. It contains two or more N-H bonds or O-H bonds as chain extenders, catalysts For ex...
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IPC IPC(8): C08L75/04C08K13/02C08K3/34C08K3/26C08K3/38C08K5/55C08J5/18C07F7/10
CPCC08K13/02C08K3/34C08K3/26C08K3/38C08K5/55C08J5/18C07F7/10C08L2201/08C08K2003/265C08K2003/387C08J2375/04C08L75/04
Inventor 王国辉张兵陈红波刘树仁廖锡广刘强杨若丽荀飞
Owner BEIJING INST OF ASTRONAUTICAL SYST ENG