4results about How to "Reduce particle count" patented technology

A method for recycling cellulose acetate, which comprises the following steps: dissolving the waste tow, waste filter rod or waste mouth rod generated in the process of producing filter rod for cigarettes after removing impurities in acetic acid aqueous solution, filtering, water solution precipitation, solid-liquid separation, washing to remove the forming paper, water pine paper and TiO2, and obtaining diacetate cellulose with quality meeting the use requirements of downstream products. The present application can completely remove the residual forming paper and water pine paper and TiO2 in the prior art. The quality of cellulose acetate before and after regeneration is compared, and it is found that AV and IV fluctuate slightly, which does not affect the use, but the PV value of regenerated cellulose acetate increases greatly, which shows that filtering and washing can significantly remove residual impurities, the quality of regenerated cellulose acetate is significantly improved, and the commercial use requirements are met; the present application has a very positive effect on reducing production cost and environmental protection.

The present invention is a bonded light-emitting element wafer in which a light-emitting element epitaxial wafer having an epitaxial layer including an active layer is bonded to a transparent substrate with an adhesive layer interposed therebetween, the transparent substrate being visible-light-transmissive and ultraviolet-light-transmissive. The adhesive layer is visible-light-transmissive and ultraviolet-light-impermeable, and the height at which spinous inclusions contained in the epitaxial layer protrude from the epitaxial layer is equal to or less than the thickness of the adhesive layer. The present invention thereby provides a bonded light-emitting element wafer in which an epitaxial wafer having thorn-like inclusions is bonded to a transparent substrate with an adhesive layer interposed therebetween, the adhesive layer being visible-light-transmissive and ultraviolet-light-impermeable, and the transparent substrate being visible-light-transmissive and ultraviolet-light-transmissive, the range of defective parts caused by spiny inclusions is narrow.

The invention provides a method for improving bonding interface quality of a composite substrate and the composite substrate. The method comprises the following steps: providing two substrates to be bonded, growing a buffer layer on a to-be-bonded surface of at least one of the two substrates, and then carrying out bonding to obtain a composite substrate; the method for growing the buffer layer comprises the following steps: (1) pre-cleaning a reaction chamber, then placing a substrate in the pre-cleaned reaction chamber, and depositing the buffer layer on a to-be-bonded surface of the substrate; and (2) carrying out preliminary cleaning on the surface of the buffer layer obtained by deposition, then turning on radio frequency, introducing oxygen, and carrying out oxygen plasma cleaning. The process before and after deposition of the buffer layer is optimized, the number of particles in the buffer layer can be effectively reduced, and therefore the bonding interface quality of the composite substrate can be effectively improved.

The invention relates to a preparation method of a flame-retardant washable water-based acrylate resin coating with moderate compatibility, which comprises the following steps: adding water, an emulsifier and methacrylic acid, stirring to react for 60 minutes, adding a monomer A, a charring agent intermediate, DOPO and 3, 4-epoxy-1-butene, and emulsifying for 20-30 minutes; heating to 80-90 DEG C, dropwise adding an initiator, reacting for 1-2 hours, adding diethanol amine, and reacting for 1-2 hours to obtain a core-layer emulsion; the preparation method comprises the following steps: adding a monomer A and a monomer B into a reaction kettle, dropwise adding a monomer B and an initiator at the same time, keeping the temperature at 75-85 DEG C, stirring and reacting for 1.5 hours, adding DOPO, 3, 4-epoxy-1-butene and an initiator, reacting for 1 hour at 60-70 DEG C, cooling to 50 DEG C, adding an emulsifier B, reacting for 30 minutes, and adding ammonia water to adjust the pH value to 7-8, so as to obtain the flame-retardant washable water-based acrylate resin coating with moderate compatibility, and the obtained acrylate resin has good flame retardance and washability.