2results about How to "Less prone to aging" patented technology

A kind of steel roof eaves wind-resistant structure, it relates to steel roof technical field, including batten board, multiple self-tapping screws and sealing device.Self-tapping screw passes through the opening on batten board and is connected with eaves beam, and compacts roof board;The diameter of opening is larger than the major diameter of screw, and sealing device is arranged in it, including protective sleeve embedded in hole and sealing ring arranged between screw and protective sleeve, sealing ring is expanded and tightly holds screw when screw is compacted and compacts roof board, and sealing is realized.Ring-shaped gasket and its bottom boss, annular groove on screw, and bending protrusion on batten board are arranged.Sealing device is arranged in the inside of opening, and is less affected by ultraviolet rays, rain, temperature difference and the like, has long service life, and is easy to maintain.The utility model improves the wind resistance and long-term sealing stability of roof.

This invention discloses a method for preparing silver paste for a mobile phone speaker diaphragm, belonging to the field of mobile phone acoustic component preparation technology. First, a compound binder is placed in a constant-temperature stirrer, and a toughening agent is added. The mixture is stirred for 40-50 minutes at 70-90°C and a stirring speed of 500-510 r / min, resulting in a binder-toughening agent mixture. Next, based on this mixture, a compound solvent is added to adjust the viscosity of the mixture at 25°C to 5000 mPa·s. The viscosity is then measured using an NDJ-1 rotational viscometer at a rotation speed of 60 r / min. The test was conducted under the conditions of / min and shear rate; and after adjustment, the temperature of the mixing system was reduced to 50-60℃, and stirring was continued for 20-30 minutes for curing treatment, and the cured bonding system was output; based on this, the present invention optimizes the entire process of silver paste preparation, adds a special toughening agent to the bonding system, and fully integrates the toughening agent and the binder through constant temperature curing treatment, which effectively improves the brittleness of the silver paste after film formation, and at the same time precisely adjusts the viscosity and thixotropy of the silver paste to adapt to the ultra-thin characteristics of the diaphragm and the application scenarios of high frequency reciprocating vibration.