36results about How to "Good composition stability" patented technology

The invention discloses a solvent-free impregnating resin for a low voltage motor and a medium voltage motor. The solvent-free impregnating resin is composed of, by weight, 40-60% of heat-resisting unsaturated polyester resin, 5-10% of benzoxazine imine resin, 10-15% of epoxy resin, 0.5-2.0% of initiator, 7.0-15% of reactive diluent, 7.0-20% of curing agent and 0.1-1.0% of curing accelerator Due to the fact that benzoxazine imine modified unsaturated solvent-free impregnating resin is synthesized by the benzoxazine imine resin, heat resistance of the impregnating resin is improved, and heat resistance of epoxy unsaturated resin is enabled to increase to the heat-resisting level of polyester imide. Besides, compounded with the high-performance curing agent, the fact that defects of short storage life, bad thermal state surface dryness, large shrinking percentage, low hanging paint amount and low cohesive force in general solvent-free resin are overcome is guaranteed. Further, the solvent-free impregnating resin is excellent in combination property, especially, the cohesive force is as high as 241N, and similar impregnating resin can not achieve the cohesive force easily.

The invention introduces a preparation method of modified HEU type zeolite and an application of the modified HEU type zeolite as a nitrogen selection adsorbent. The preparation method comprises the following steps of uniformly mixing SiO2 with Al2O3, Na2O, K2O and H2O according to the mole ratio of the SiO2 to the Al2O3, to the Na2O, to the K2O and to the H2O being (8-20) to 1 to (0.5-3) to (0.5-3) to (300-800) to obtain initial aluminosilicate sol, then adding artificial synthesis structure induction species of which the mass percentage is about 1-20%, performing low-temperature ageing, performing high-temperature crystallization, performing solid-liquid separation, and performing drying so as to obtain high-crystallinity HEU type zeolite. According to the preparation method disclosed by the invention, the crystallization period can be greatly shortened and can be shortened to 12h, and besides, the synthesized HEU type zeolite can be guaranteed to have small and uniform grain size (1-3[mu]m); and after ion exchange modification, different ion exchange modified adsorbents can be obtained, and the selective adsorption capacity of the adsorbents to N2 in N2 / CH4 mixed gas is obviously improved and can be improved by 2-15 times.

The invention discloses a flexible printed circuit board washing agent, a flexible printed circuit board washing method, a flexible printed circuit board, and electronic equipment, and belongs to thetechnical field of circuit board washing. The flexible printed circuit board washing agent comprises, by mass, 30 to 45% of N-methyl pyrrolidone, 20 to 35% of butyrolactone, 1.5 to 3% of a carboxylicacid complexing agent, 0.5 to 2% of a penetrating agent, and the balance water. According to the flexible printed circuit board washing method, the flexible printed circuit board washing agent is usedfor washing the flexible printed circuit board. The flexible printed circuit board washing method is capable of solving problems in the prior art that complete removing of residual rosin is impossible to realize using conventional flexible printed circuit board washing agent, white spots are left on the flexible printed circuit board after washing, the conventional flexible printed circuit boardwashing agent is not safe, and is not friendly to the environment, and water washing is inconvenient to realize after applications of the conventional flexible printed circuit board washing agent. Theflexible printed circuit board washing agent is capable of removing rosin matters left on the flexible printed circuit board, and removing metal oxides and grease on the flexible printed circuit board, is excellent in stain removing effect, corrosion of flexible printed circuit board is not caused, after washing, the surface of the flexible printed circuit board is clean and bright, and no whitespot is generated.

The present application discloses an embedded particle and a preparation method and application thereof. The embedded particles include a vitamin K2 inner core, an embedding agent layer I, a vitamin D3 layer, an embedding agent layer II, a calcium source layer, and an embedding agent layer III from the inside to the outside; wherein, the calcium source layer, the vitamin D3 layer, The mass ratio of the vitamin K2 inner core and the embedding agent is 50.5-75: 0.13-0.19: 1.0-1.4: 0.1-5; the quality of the embedding agent is the embedding agent layer I, the embedding agent layer II, the embedding agent The sum of the masses of layer III. The embedded particles have a layer-by-layer embedded structure, with higher stability and longer shelf life.

The invention discloses a plane network impact wave loading device and a making method of the device. The loading device comprises a network board base plate, an attenuation layer and a mounting sleeve. The network board base plate, the attenuation layer and the mounting sleeve are integrally connected through screws, and the network board base plate and the attenuation layer are made of 2Al2 aluminium alloy. The plane network impact wave loading device is simple in structure, the time range of unevenness of impact waves can be effectively narrowed, and the planarity of output impact waves isimproved; the making method is used for making the loading device.