5results about How to "Avoid Bubble Defects" patented technology

The application belongs to the technical field of waterborne polyurethane preparation, and particularly relates to a solvent-free photocuring polyurethane and a preparation method thereof, which comprises the following steps: 1) mixing 1,6-hexane diisocyanate trimer, hydroxypropyl acrylate and a polymerization inhibitor at 55-65 DEG C, and obtaining a PUA prepolymer after reaction; 2) mixing the PUA prepolymer, epoxy acrylate resin, hydrogenated rosin glyceride, an active diluent mixture containing a photoinitiator, PETMP, a tertiary amine type co-initiator, a silane coupling agent and a polymerization inhibitor, stirring, defoaming, filtering, and obtaining the solvent-free photocuring polyurethane; the application has the advantages of fast curing speed and high storage stability.

The utility model discloses a kind of photosensitive dry film winding devices, including box, winding mechanism, pressing mechanism and moving mechanism, box front and rear are provided with box door;Winding mechanism is set in box, winding mechanism includes winding roller, winding roller is wound to photosensitive dry film under the action of winding mechanism;Pressing mechanism is used to resist photosensitive dry film;Moving mechanism includes second support frame and second sleeve, one end of second sleeve is rotatably connected in second support frame, moving mechanism is used to drive the other end of second sleeve and the roll axle of winding roller away from the one end of winding mechanism is connected or separated.

The application belongs to the technical field of ion sieve adsorption, and particularly relates to a manganese-based ion sieve composite hydrogel and a preparation method thereof. 1.6 Mn 1.6 O4 precursor, and further processing obtains H 1.6 Mn 1.6 O4 ion sieve. The H 1.6 Mn 1.6 O4 ion sieve is mixed with a photo-thermal agent and a surfactant to obtain an HMO suspension; the HMO suspension is mixed with a gelatin aqueous solution, acrylamide and a pore-forming agent to obtain a hydrogel premix; the hydrogel premix is subjected to low-temperature initiation and high-temperature curing, and then is soaked in deionized water to obtain the manganese-based ion sieve composite hydrogel. The composite hydrogel prepared by the application has strong lithium ion adsorption force and can effectively complete the function of lithium extraction from salt lake brine.

The invention belongs to the technical field of functional polymer materials, and particularly relates to an epoxy resin latent curing agent based on a negative thermal expansion principle and a preparation method thereof. The preparation method comprises the following steps: 1) carrying out surface hydrophilization treatment on a porous negative thermal expansion material to obtain a surface-modified porous negative thermal expansion material; and 2) mixing the surface-modified porous negative thermal expansion material with an aliphatic amine curing agent, so that the aliphatic amine curing agent is adsorbed and diffused to the surface and pore channels of the porous negative thermal expansion material. Compared with an existing latent curing agent, the prepared epoxy resin latent curing agent based on the negative thermal expansion principle has the advantages of being long in storage stable period, high in curing efficiency, controllable in curing process and the like, effectively overcomes the defects in the prior art and has high application value.

This utility model discloses a blow molding die for a blow molding machine, including a support and a die slidably disposed inside the support. The die includes a left half and a right half symmetrically arranged. Electric push rods for driving the left and right half to move and close the die are respectively provided on the left and right sides of the support, corresponding to the left and right half. Both the left and right half have cavities matching the product shape, and micropore arrays are distributed on the surface of the cavities. Both the left and right half have a combined venting system, which includes a main venting groove extending along the die mating surface and an auxiliary venting channel communicating with the micropore array. This utility model, by setting a micropore array on the surface of the die cavity and cooperating with the combined venting system, allows gas in thin-walled areas to be quickly discharged, avoiding bubble defects and significantly improving product surface quality and yield.