4results about How to "Guaranteed barrier properties" patented technology

The invention relates to the technical field of degradable high polymer materials and disposable personal care products, and discloses a preparation process of a degradable high-barrier plastic film for a hair dyeing shawl, and the preparation process comprises the following steps: 1, preparing chitosan-dopamine grafted modified montmorillonite (CTS-DA-MMT): dispersing 5g of 20-30nm nano montmorillonite in a 2wt% acetic acid solution, and ultrasonically dispersing for 40 minutes by 200W; adding dopamine hydrochloride according to the ratio of montmorillonite to dopamine being 1: 0.2, adjusting the pH value to 8.5 by using 1mol / L NaOH, and carrying out stirring reaction at room temperature for 1 hour; adding chitosan according to the ratio of montmorillonite to chitosan being 1: 0.4, and stirring and reacting at the constant temperature of 50 DEG C for 3 hours; the pH is adjusted to 7.0 through 1 mol / L HCl, centrifugation is carried out for 15 min at the speed of 8000 r / min, washing is carried out three times through deionized water, vacuum drying is carried out for 8 h at the temperature of 60 DEG C, and the product is obtained. According to the preparation technology of the high-barrier plastic film for the degradable hair dyeing shawl, chemical grafting (instead of physical blending) of montmorillonite-dopamine-chitosan is achieved through catechol groups of dopamine, the problems of montmorillonite agglomeration and matrix compatibility are solved, and the degradable hair dyeing shawl is prepared. Meanwhile, through the dynamic adhesiveness of dopamine, the problem of barrier failure under dynamic stretching is solved.

The application discloses a kind of multilayer co-extrusion high-barrier plastic container extrusion forming device and method, it is related to extrusion molding technical field, including support frame, the upper portion of the support frame is provided with forming mechanism, for extrusion molding, the forming mechanism includes: conveying assembly, setting in the upper portion of support frame, for conveying melt;Flow distribution component, including the support ring fixed in the side of conveying assembly, the inside of the support ring is fixedly installed with outer tube, the top of the outer tube is fixedly installed with flow distribution plate, the lower portion of the flow distribution plate is fixedly installed with straight pipe, inner mould adopts the structure that heat conduction cylinder is inlaid capillary tube, capillary tube inside fills heat conduction medium, utilizes capillary effect to realize medium spontaneous microcirculation heat conduction, form even heating uniform temperature effect, simultaneously along heat conduction cylinder vertical equidistance arrangement annular coil is heated independently in section, temperature sensor is detected mould temperature in real time, extrusion molding whole process continues to smooth the temperature difference of each area of mould body, inhibits temperature instantaneous fluctuation.

The invention discloses a foam material with a thin film layer / foam hole layer alternate multi-layer structure and a preparation method of the foam material. The preparation method comprises the following steps: S1, weighing polystyrene and polymethyl methacrylate; s2, polystyrene and polymethyl methacrylate are prepared into a polymer sheet through multi-layer co-extrusion equipment, the polymer sheet comprises polystyrene layers and polymethyl methacrylate layers which are alternately stacked, the thickness of the polystyrene layers is 5-25 microns, and the thickness of the polymethyl methacrylate layers is 5-25 microns; s3, the polymer sheet is placed in a high-pressure kettle for saturation, after full saturation, a sample is taken out of the high-pressure kettle, foaming is conducted at the foaming temperature, the polystyrene layer forms a foam hole layer, the polymethyl methacrylate layer forms a thin film layer, and the foam material of the thin film layer / foam hole layer alternate multi-layer structure is prepared.

The application provides an alternator, which comprises a motor shell, a stator assembly arranged in the motor shell, a rotor assembly arranged in the stator assembly and connected with the motor shell, a rectification assembly arranged on one side of the motor shell, a heat dissipation fan arranged on the other side of the motor shell, and a middle shaft for connecting the rectification assembly, the rotor assembly and the heat dissipation fan, characterized in that the motor shell is symmetrically provided with a rear end cover and a front end cover on both sides, respectively, and a belt transmission wheel is fixedly arranged at one end of the middle shaft and extends to the outside of the front end cover. The filter mechanism is arranged, so that the particulate matter is blocked on the surface of the annular blocking net when the heat dissipation fan rotates to send the external air into the motor shell, and the particulate matter blocked on the annular blocking net does not completely cover and accumulate on the surface due to the annular structure of the annular blocking net, so that the heat dissipation fan can interact with the external air to the maximum extent.