3results about How to "Guaranteed color stability" patented technology

A method for preparing white stable lignin and its application are disclosed. This invention addresses the limitations of existing lignin decolorization processes, which are constrained by long decolorization times and difficulty in maintaining color stability under ultraviolet light stimulation after decolorization, thus failing to meet the low absorption requirements of radiative cooling materials in the visible light band. The method includes: 1. Preparation of DES; 2. Preparation of lignin solution; 3. Modification of lignin; 4. Bleaching; 5. Preparation of white stable lignin. Application: It is used in the preparation of refrigeration materials.

The invention discloses a safe and environment-friendly Paris green substitute pigment as well as a preparation method and application thereof, and belongs to the technical field of materials. And weighing 12.5-18.6 parts of modified nano titanium dioxide, 46.5-62.5 parts of art green, 21.9-27.9 parts of peacock blue and 3.1-7.0 parts of fluorescent green 3G, respectively sieving by a 200-mesh sieve, and uniformly stirring to obtain the substitute pigment. The pigment obtained by mixing the modified nano titanium dioxide with other raw materials is similar to the Paris green in color, and can be used as a safe and environment-friendly pigment for replacing the Paris green. The modified nano titanium dioxide contains a benzophenone structure, a quaternary ammonium salt antibacterial structure and a sulfonamide group, so that the modified nano titanium dioxide has excellent ultraviolet resistance and antibacterial activity, and when the modified nano titanium dioxide is added into the pigment, the pigment can be prevented from being damaged by microorganisms and is not prone to decay, mildew and blackening; meanwhile, the weather resistance of the pigment is greatly enhanced, the color stability of the pigment is maintained, and the service life of the pigment is prolonged.

The invention relates to the technical field of softening methods, in particular to a high-temperature cooking, processing and softening method for lactic acid extraction. The preparation method comprises the following steps: step 1, preparing raw materials; step 2, crushing the raw materials; step 3, mixing; step 4, cooking at a high temperature, step 5, filtering, step 6, cooling, step 7, concentrating, step 8, crystallizing, step 9, separating, step 10, drying, and step 11, screening and packaging. According to the method, the heavy-phase lactic acid is crushed into small particle size through the crushing and sieving machine, the contact area of the raw material and the solvent is increased, mass transfer and heat transfer in the subsequent mixing and cooking process are facilitated, the extraction efficiency is improved, interaction between the lactic acid and the solvent can be accelerated through high-temperature cooking, and the lactic acid is more easily released from the raw material; and in the cooking process, the mixture is ensured to be uniformly heated through stirring operation, lactic acid decomposition or quality reduction possibly caused by local overheating is prevented, and the stability and quality of the product are ensured.