3results about How to "Hinder contact" patented technology

This invention discloses a functionalized MXene-based waterborne fire-retardant coating, its preparation method, and its application, belonging to the field of fire-retardant coating technology. This invention combines the advantages of functionalized MXene materials, such as high dispersibility, high temperature resistance, and excellent flame-retardant properties, using waterborne polyurethane as the resin matrix, ammonium citrate as the acid source, and MXene materials as nanostructured flame retardants to develop an environmentally friendly, high-performance reinforced waterborne fire-retardant coating. The MXene materials can be obtained through chemical modification with different functional groups (such as silane coupling agents, calixarenes, and MOFs) to introduce polar groups onto the surface. The fire-retardant coating prepared using functionalized MXene materials achieves UL-94 V-0 flame retardancy through a dual mechanism of physical barrier and "catalytic char formation," while also possessing high mechanical strength and thermal stability, making it suitable for protecting substrates such as metals and wood.

This invention relates to the field of yak milk processing technology, and discloses a device and method for separating active substances from yak milk, comprising: a first separation unit, a first processing unit, a pH adjustment unit, a second separation unit, and a third separation unit connected in sequence; the first separation unit is used for centrifugation of yak milk to obtain skimmed yak milk; the first processing unit is used for defoaming the skimmed yak milk; the second separation unit is used for centrifugation of the pH-adjusted skimmed yak milk to obtain supernatant and casein; the third separation unit is used for chromatographic separation of the supernatant to obtain lactoferrin and immunoglobulins. The defoaming treatment of the skimmed yak milk in the first processing unit effectively eliminates air bubbles in the skimmed milk, preventing air bubbles from occupying space and hindering the full contact between the acid solution and the skimmed yak milk, preventing local pH unevenness, improving the mixing effect of the skimmed yak milk and acid solution, increasing the casein yield, and ensuring the subsequent separation effect.

The invention discloses a preparation method of a high-stability natural plant extract bio-based paint, and relates to the technical field of paints.The preparation method comprises the following steps that 1, raw material modification is conducted, specifically, corn starch, deionized water and NaOH are mixed and gelatinized according to the mass ratio of 30: (100-110): (1-1.2) to obtain starch paste liquid, then the starch paste liquid and a graft are subjected to end sealing and grafting treatment, and modified starch emulsion is obtained; step 2, composite treatment: uniformly mixing and stirring the modified starch emulsion and the water-based alkyd resin emulsion in a mass ratio of 7: (2.9-3.1), then adding a nano cellulose whisker dispersion liquid accounting for 2-2.1 wt% of the total mass and tween-80 in a mass ratio of corn starch to the nano cellulose whisker dispersion liquid being 30: (1.1-1.2), and then stirring and mixing to obtain a dispersed composite emulsion; step 3, mixing and preparing to obtain a bio-based coating; wherein the graft is a lignosulfonate graft copolymer solution; the water-based alkyd resin emulsion is obtained by performing alcoholysis and polycondensation on soybean oil. The high-stability natural plant extract bio-based coating has the effect of improving the structural stability of the high-stability natural plant extract bio-based coating.