润滑科技信息平台

专利摘要

本发明提供了一种耐高温固体自润滑材料的制备方法,包括以下步骤:首先将聚合物基体树脂与纳米润滑填料混合,制成均匀的原料粉末; 然后,将原料粉末放入热压模具的型腔内; 在第一预压温度下保温90-120min,将热压压力控制在第三预压压力下,逐渐升温至材料的固相成型温度; 固相成型完成后,逐渐降温至第一预压温度; 然后卸压,最后自然冷却至常温脱模得到固体自润滑材料。本发明根据玻璃化转变温度的漂移值来调节热压成型温度,以避免复合材料在模压成型过程中因塑化不均匀和过热而引起摩擦性能和力学性能的下降。 ......

基本信息

专利类型:
发明专利
申请/专利号:
US18/079614
申请日期:
2022-12-12
专利申请人:
分类号:
C10M111/04 ; B29C43/00 ; C08G73/10 ; C08K3/04 ; C10M103/02 ; C10M107/44 ; C10M177/00
发明/设计人:
DUAN, HAITAO ， WAN, CHANGXIN ， ZHAN, SHENGPENG ， JIA, DAN ， LI, JIAN ， ZHANG, WULIN ， YANG, TIAN ， LI, YINHUA
权利要求: 1. A preparation method of solid self-lubricating material with high temperature resistance, including the preparation steps as follows:step 1, mixing polymer matrix resin and nano lubricating filler to compose a uniform raw material powders;step 2, placing the raw material powders in the cavity of hot-press die, gradually increasing the temperature of the first preloading temperature under the first preloading pressure;step 3, keeping the temperature for 90-120 min at the first prepressing temperature, and at the same time, controlling the hot pressing pressure to the second prepressing pressure;step 4, controlling the hot-pressing pressure under the third pre-loading pressure, and gradually increasing the temperature to the solid-phase molding temperature of the material; the solid-phase molding temperature of that material is 15-20° C. higher than the glass transition temperature of the material;step 5, carrying out heat preservation for 60-180 min under the molding pressure for solid-phase molding after the hot pressing temperature reaches the solid-phase molding temperature of the material;step 6, gradually reducing the temperature to the first preloading temperature after the solid-phase molding is completed, next, removing the pressure, finally, obtaining the solid self-lubricating material by naturally cooling to normal temperature and demoulding.2. The preparation method of solid self-lubricating material as claimed in claim 1, the molding parameters are as follows:in step 1, the first preloading pressure is 8-10 MPa, the first preloading temperature is 240-260° C., and the heating rate is 2-5° C./min;in step 2, the second preloading pressure is 13-15 MPa;in step 3, the third preloading pressure is 25-35 MPa, and the heating rate is 1-3° C./min;In step 4, the molding pressure is 35-45 MPa;In step 5, the cooling rate is 1-2° C./min.3. The preparation method of solid self-lubricating material as claimed in claim 1, in step 1, the weight ratio of the polymer matrix resin to the nano lubricating filler is 100:(1-10) in raw material powders.4. The preparation method of solid self-lubricating material as claimed in claim 1, in step 1, the polymer matrix resin is a polyimide block copolymers with a glass transition temperature of 300-360° C. and an average particle size of 10 μm.5. The preparation method of solid self-lubricating material as claimed in claim 1, at least one dimension of the nano lubricating filler is nano-scale, meaning the size is less than 100 nm.6. The preparation method of solid self-lubricating material as claimed in claim 1, the nano lubricating filler is inorganic nano filler or organic graft modified inorganic nano filler.7. The preparation method of solid self-lubricating material as claimed in claim 6, the inorganic nano filler is any one or more of graphene, carbon nanotubes, fullerenes, nano graphene and nano molybdenum disulfide.8. The preparation method of solid self-lubricating material as claimed in claim 4, in step 1, the polyimide is apolyimide soft and hard segments block copolymer; the block copolymer is prepared by copolymerization of polyimide hard segment I and polyimide soft segment II; the polyimide hard segment I is obtained by copolymerization of pyromellitic dianhydride and diaminodiphenyl ether and end-capping with diamine, the polyimide soft segment II is obtained by copolymerization of benzophenone tetracarboxylic dianhydride and diphenylmethane diisocyanate and end-capping with dianhydride.9. The preparation method of solid self-lubricating material as claimed in claim 8, there are two mixing modes of polyimide and nano lubricating filler, described as follows:the first mixing mode, introducing nano lubricating filler into the reaction system, after the polyimide block I reacts with the polyimide block II to generate polyamic acid, but before the imidization;the second mixing mode, carrying out copolymerization of polyimide hard segment I and polyimide soft segment II to obtain polyimide powder; applying the ultrasonic dispersion-ball milling collaborative mixing process to mix the polyimide powder, nano lubricating filler and solvent; carrying out ultrasonic dispersion at room temperature for 60-120 min; using heating reflux extraction to obtain a blend, using a planetary ball mill to blend the blend for 100-140 min, then drying the blend in an oven at 110-130° C. for 1-3 h to remove the residual volatile matter, finally, obtaining uniformly mixed raw material powder.10. The preparation method of high-performance plastic structural parts as claimed in claim 8, the preparation method of soft and hard segment block copolymer block polyimide is described in the steps as follows:step 1.1, preparation of polyimide soft segment II: placing benzophenone tetracarboxylic dianhydride and N-methylpyrrolidone in a three-necked flask equipped with a stirring and condensing device under the protection of nitrogen atmosphere, and heating the flask until the solid reactants are completely dissolved;next, adding 1,4-diazabicyclo [2.2.2]octane first, then adding diphenylmethane diisocyanate in batches for copolymerization, discharging CO2 generated during the polymerization through a condenser, finally, obtaining BTDA-MDI soft segment copolymer solution end-capping with dianhydride, and cooling it for later use;step 1.2, preparation of polyimide hard segment I: dissolving diaminodiphenyl ether in N-methylpyrrolidone, controlling the temperature below 18-22° C., and then adding pyromellitic dianhydride in batches to obtain a hard segment copolymer solution of PMDA-ODA end-capping with diamine;step 1.3, adding the cooled BTDA-MDI soft segment copolymer solution to the PMDA-ODA hard segment copolymer solution at a constant speed, and keeping the reaction temperature below 18-22° C. for block copolymerization to obtain the polyimide soft and hard segments block copolymer.