5results about How to "Improve barrier efficiency" patented technology

The present application relates to a kind of synergistic flame-retardant low melting point polyester chip for polyester sheath-core and its preparation method, the melting point of product is reduced by introducing part of asymmetric isomer of terephthalic acid in esterification process, while introducing part of symmetric structure alcohol with small difference with ethylene glycol, the chain regularity is less damaged, a small amount of introduction will not significantly damage the crystallization ability of product while reducing the melting point. After esterification, by means of blending and co-melting and alcoholysis repolymerization, flexible chain segment (‑O‑(CH2)4‑O‑) with fast crystallization speed is introduced to improve the crystallization performance of product, and finally the modified synergistic flame retardant is added. Nitrogen, phosphorus and silicon elements are introduced into the product chain segment during polycondensation reaction, and a triple protection system covering condensed phase, gas phase and interface is formed through the multidimensional complementary action of the three elements during combustion. Through the above steps, polyester chip for polyester sheath-core with high flame retardancy, low melting point and high crystallinity is finally synthesized.

The utility model relates to laboratory safety equipment technical field especially, more particularly to a kind of intelligent laboratory ventilation control device, including experiment cabinet and first telescopic pipe etc., controller is installed in experiment cabinet side edge, the front side of experiment cabinet is slidably connected with baffle, exhaust gas concentration detector is installed in the bottom of moving plate, exhaust fan is installed in moving plate, exhaust pipe is connected in the top of experiment cabinet, connecting pipe is connected in the top of exhaust pipe, connecting pipe is communicated with external exhaust gas treatment equipment, first telescopic pipe lower end is sealingly connected with the outer ring of the top of exhaust fan, first telescopic pipe upper end is sealingly connected with the inner ring of exhaust pipe, the front end of moving plate is provided with the isolation component for isolating exhaust gas. Through the real-time linkage of exhaust fan and exhaust gas concentration detector, according to gas concentration adjustment exhaust fan speed, while electric slide rail drives moving plate to move down and reduce exhaust gas capture distance, so that exhaust volume is always matched with exhaust gas production, reach the purpose of self-regulating air volume, while reducing invalid exhaust energy consumption.

The invention belongs to the technical field of capsule preparation, and relates to a glue solution for reducing volatilization of essence in tobacco capsules, which is composed of low-acyl gellan gum, high-acyl gellan gum, agar 1000, agar 600, sodium alginate, sorbitol, potassium chloride, calcium chloride and water in specific mass percentage. The preparation method is characterized in that the content of sodium alginate is increased to 0.22%, 0.05% of calcium chloride is added, and a more compact gel network and a physical wrapping structure are formed in a capsule shell through the ionic cross-linking synergistic effect between sodium alginate and calcium chloride, so that the blocking and retaining capability on essence molecules is remarkably enhanced. The invention also provides a detailed preparation process of the glue solution. The tobacco capsule prepared from the glue solution can reach more than 85% in essence residual rate after being stored for 6 months at room temperature, the essence residual rate is greatly improved compared with the traditional formula, meanwhile, the hardness and disintegration performance required by the capsule are completely maintained, the existing production process does not need to be changed, the glue solution is suitable for various volatile essences such as terpenes and esters, and the essence loss and the production cost can be effectively reduced.

The utility model discloses a low -noise motorcycle engine cylinder cover belongs to cylinder cover technical field, it includes cylinder cover body, the inside wall of cylinder cover body is equipped with the noise reduction structure, the inside wall center place of cylinder cover body is equipped with cooling structure, the inside center upper place of cylinder cover body is equipped with support structure, the cooling structure includes cavity, the inside wall center place of cylinder cover body is equipped with the cavity, the inside center upper place of cavity is equipped with cooling pipe, in addition, the utility model discloses, can be targeted to attenuate valve knock, gas turbulence etc. high frequency noise, and the noise reduction amount reaches 10 15dB, solve the problem that high frequency noise penetrability is strong, simultaneously, absorb the vibration energy that cylinder body resonance and component low frequency impact produced, and the barrier efficiency improves 20 30%, solved the defect that low frequency noise suppression is insufficient, and, reduce gas leakage noise 8 12dB, also through the rigid vibration transmission of elastic contact reduction cylinder cover and cylinder, avoid resonance and produce additional noise.

The invention relates to the technical field of traditional Chinese medicine preparations, in particular to a compound emblic leafflower fruit sore-throat relieving lozenge film-coated tablet for treating throat diseases and a preparation method thereof. The compound emblic leafflower fruit sore-throat relieving lozenge film-coated tablet for treating throat diseases comprises a tablet core and a film coating layer wrapping the tablet core, the tablet core comprises phyllanthus emblica dry paste powder, compound dry powder, menthol, borneol, corn starch, sucrose powder and hydroxypropyl methylcellulose; the compound dry powder is a water extract of a mixture of radix scrophulariae, platycodon grandiflorum and liquorice; the weight ratio of the corn starch to the sucrose powder to the hydroxypropyl methylcellulose is (0.5-15): (45-60): (0.5-8); the film coating layer comprises gelatin; the weight ratio of the gelatin to the hydroxypropyl methylcellulose is (0.5-8): (0.3-3). The compound emblic leafflower fruit sore-throat relieving lozenge film-coated tablet for treating throat diseases has good storage stability, and the appearance and palatability are improved.