60results about How to "Avoid accelerated aging" patented technology

The invention discloses an internal lubricant for polyvinyl chloride (PVC) resin molding processing and a preparation method thereof. The internal lubricant for PVC resin molding processing is a polymer pretreatment organic auxiliary material prepared only through carbon-carbon unsaturated bond reactions. The internal lubricant for PVC resin molding processing is characterized by comprising: by weight, 50 to 95 parts of epoxy oleic acid, 4.5 to 49.5 parts of one or more aliphatic dihydric alcohols and 0.1 to 0.5 parts of butyl titanate. The preparation method comprises the following steps of 1, raw material feeding and heating, 2, a condensation reaction, and 3, slicing and packaging. The internal lubricant for PVC resin molding processing has excellent lubricating properties, good compatibility and dispersity, and certain auxiliary heat stability. Epoxy groups of the epoxy oleic acid have chemical activity and can absorb hydrogen chloride and thus PVC plastic accelerated ageing is avoided and a stabilization effect is obtained. The internal lubricant for PVC resin molding processing has good compatibility with other components of a PVC molding processing formula system and has a low production cost.

The invention discloses a backlight module used in a liquid crystal display device and a control method of the backlight module. The backlight module comprises a light emitting unit and a power supply used for supplying power for the light emitting unit. The light emitting unit comprises a plurality of light sources connected in parallel, a plurality of switches corresponding to the light sources and a controller used for controlling the on-off state of each switch. Each light source is electrically connected with the power supply through one corresponding switch, and the switches are electrically connected with the controller. When the backlight module is started, the controller chooses to connect one of the switches in the following steps so as to turn on the light source corresponding to the connected switch. By means of the backlight module and the control method of the backlight module, service life of the backlight module can be prolonged.

The invention discloses a direct methanol fuel cell catalyst layer gradient membrane electrode, which comprises a gas diffusion layer, a microporous layer, a catalyst layer and a proton exchange membrane, and is characterized in that the catalyst layer of the direct methanol fuel cell membrane electrode has a spanwise gradient structure, and the catalyst load from the vicinity of a fuel and air inlet to the vicinity of an outlet is gradually increased. Compared with the prior art, the membrane electrode has the advantages that the hydrothermal management capacity is high; the current density is uniformly distributed; and catalyst utilization is improved. In conclusion, the gradient membrane electrode of the catalyst layer of the direct methanol fuel cell is reasonable in structure, powerful in function and suitable for popularization and application.

The invention discloses a suspension protection construction method for a high-voltage cable pipeline transversely penetrating through the middle of a large-span foundation pit. The suspension protection construction method comprises the following steps that S1, a construction environment is surveyed; S2, foundation pit structure construction of the section not affected by the high-voltage cable pipeline is achieved; S3, lifting construction of the high-voltage cable pipeline is achieved; S4, laying and suspension construction of the high-voltage cable pipeline are achieved; S5, integrity protection construction of the high-voltage cable pipeline is carried out; and S6, underground main body structure construction is achieved. According to the suspension protection construction method for the high-voltage cable pipeline transversely penetrating through the middle of the large-span foundation pit, the high-voltage cable pipeline is arranged in a root division and segmentation manner that two ends are radiated and the middle is parallel, so that the suspension weight and span of the high-voltage cable pipeline can be reduced and shortened, and the safety and reliability of flexible suspension are improved; and meanwhile, underground existing structures such as inclined supporting beams, top beams and the like are assisted, bearing steel wire ropes are arranged in a short-span and long-span alternating and multi-row parallel mode so as to carry out flexible suspension on the high-voltage cable pipeline, the suspension weight can be evenly distributed on the inclined supporting beams, and therefore the suspension safety and stability are further improved.

The invention discloses a window guardrail with high safety performance and capable of preventing children from falling, and relates to the technical field of door and window hardware. The window guardrail comprises a base, wherein the top of the base is fixedly connected with a frame, sliding grooves are formed in the inner sides of the base and the frame, the sliding grooves penetrate through the frame, handrails are connected between the inner walls of the sliding grooves in a sliding manner, the two ends of the outer sides of the handrails are sleeved with gears, and gear plate grooves areformed in the two sides of the inner walls of the sliding grooves. The window guardrail with high safety performance and capable of preventing children from falling can realize the purpose of preventing children from falling without increasing the sealing performance of windows, the protection function is triggered in time after children touch the window guardrail, the intellectualization degreeis high, the window guardrail can provide foot support when children get stuck on the window guardrail, reduces physical output of children and fights for more time for rescue, at the same time, the window guardrail can provide buffering when a child falls and prevents the child from being injured in collision with a building, and the safety performance is improved.

The invention discloses a directly embedded high-power LED illumination module comprising a printed circuit board (PCB), an LED module and a constant-current driving module. The LED module and a constant-current driving module are connected and directly embedded on the surface of the PCB; the LED module comprises an LED chip and a copper diffuse-reflection lamp cup; the copper diffuse-reflection lamp cup comprises a copper cup body and an inwards concave reflection cup cavity arranged on the top of the copper cup body; a cup seat of the copper diffuse-reflection lamp cup is embedded inside the PCB, and the reflection cup cavity exposes out of the PCB; and the LED chip is arranged inside the reflection cup cavity. The invention adopts a chip directly embedded strategy and the technology ofthe copper diffuse-reflection lamp cup, thereby reducing the assembly cost, improving the heat conduction efficiency, realizing non-epoxy beam transformation, greatly enhancing the external quatum efficiency of white light LED and avoiding serious light decay caused by etiolation of ethoxyline resin.

The invention discloses a writing brush capable of accurately adjusting the ink flow rate. The writing brush comprises a main brush holder and a brush hair protective cover, wherein an upper end cover is connected to the upper part of the main brush holder; a suspension rope is connected to the upper part of the upper end cover; a holding rod is connected to the lower part of the main brush holder; external threads are separately arranged at the out sides of the middle of the upper end cover and the lower end of the holding rod; the brush hair protecting cover is positioned outside a brush head; internal threads corresponding to the external threads are arranged at the inner side of the upper part of the brush hair protective cover; an ink leakage hole is formed in the bottom of the brush hair protective cover; an ink sac is arranged inside the main brush holder; a piston is arranged inside the ink sac; a piston rod is fixedly connected to the upper part of the piston; the middle of the piston rod and a limiting block are connected in a penetrating way; and a rotating loop bar sleeves the outer side of the upper part of the piston rod through the internal threads. On the whole, the writing brush disclosed by the invention has the characteristics that the structure is simple; brush hairs of the writing brush can be effectively protected; meanwhile, ink can be stored for bringing convenience to use of users; and the writing brush is worthy of being popularized.

The invention discloses a high-temperature-resistant oil pipe joint and a preparation method thereof, and aims to solve the problems that in the prior art, an oil pipe joint is poor in high-temperature resistance, aging of the joint is accelerated due to long-time high-temperature operation, the service life is short, the quality of a product cannot be detected in the preparation process, and the production cost is low. The defects in the product cannot be found, and the quality degree of the product is reduced. The oil pipe joint comprises an internal thread joint and an insertion rod fixed at the right end of the internal thread joint. According to the oil pipe joint and the preparation method thereof, by means of the design of the high-temperature-resistant coating, the high-temperature-resistant effect is achieved, the high-temperature-resistant performance of the oil pipe joint is improved, it is avoided that aging of the joint is accelerated due to long-time high-temperature operation, and the service life of the oil pipe joint is prolonged; therefore, product cracks or other defects hidden inside can be found in time, normal use of the oil pipe joint is guaranteed, and the effect of the high-temperature-resistant finish paint is guaranteed.

The invention relates to a method for preparing a composite conductive polyethylene carbon black material with improved positive temperature coefficient performance. The method comprises the following steps of: (1) preparing a hyper dispersant from 12-oxystearic acid, an antioxidant, a catalyst, dimethylbenzene and the like; (2) preparing modified carbon black from carbon black and a titanate hyper dispersant or a phosphate hyper dispersant or a mixture of the titanate hyper dispersant and the phosphate hyper dispersant; and (3) preparing the composite conductive polyethylene carbon black material from high-density polyethylene, low-density polyethylene, the modified carbon black, the antioxidant and the like. The composite conductive polyethylene carbon black material provided by the invention improves the interaction between a conductive filler and a high molecular matrix, effectively inhibits the agglomeration and the position offset of carbon black in the matrix, increases the PTC(Positive Temperature Coefficient) strength, retards the NTC (Negative Temperature Coefficient) effect, and increases the stability of PTC effect in repeated heating cycle. The method has simple process and low cost, basically causes no pollution to the environment and is convenient to popularize and apply widely.