17results about How to "Excellent reworkability" patented technology

The invention relates to the technical field of adhesives, in particular to a dual-curing UV tackifying adhesive and a product thereof. The dual-curing UV tackifying adhesive is prepared from the following components in parts by weight: 73 to 92 parts of acrylate copolymer, 6 to 25 parts of UV polyester resin, 0.4 to 1.7 parts of thermal curing agent and 0.3 to 1 part of photoinitiator. According to the dual-curing UV tackifying adhesive disclosed by the invention, the components are compounded, so that the adhesive can be endowed with relatively low and appropriate bonding strength in a thermocuring stage, the bonding and positioning requirements are met, and the dual-curing UV tackifying adhesive can be stripped from an adhered object and has excellent reworkability; and after positioning, the bonding force between the adhesive and the pasted object is increased through UV illumination, so that the pasting effect of the adhesive on the pasted object is ensured.

The invention provides a backlight module and a display device, the backlight module comprises a back plate and a reflection cup, the back plate comprises a bottom plate and a side plate, the bottom plate and the side plate form a containing cavity, the reflection cup is arranged in the containing cavity, and the backlight module is characterized in that a reflection cup fixing structure is arranged on the side, close to the bottom plate, of the reflection cup and penetrates through the bottom plate; an anti-loosening structure used for preventing the reflection cup fixing structure from loosening is arranged on the side, away from the reflection cup, of the bottom plate. By optimizing the fixing mode of the reflecting cup, the problem that the reflecting cup tilts after reliability testing is solved, reworkability and fixing reliability of the reflecting cup are improved, and cost is saved.

This invention relates to a retardation film comprising: an A layer having a slow axis, and a B layer having a slow axis at an angle of 85° to 90° to the slow axis of the A layer; the A layer is formed of a resin A having positive intrinsic birefringence; the B layer is formed of a resin B having negative intrinsic birefringence; the resin B comprises polyester, polycarbonate, or polyester carbonate, wherein the polyester, polycarbonate, or polyester carbonate contains a fluorene framework; the overall in-plane retardation of the A layer and the overall in-plane retardation of the B layer satisfy a specific relationship; the in-plane retardations Re(450) and Re(550) of the retardation film at wavelengths of 450 nm and 550 nm satisfy a specific relationship; the overall thickness T of the A layer... A The overall thickness T of layer B B The ratio of T A / T B It ranges from 30 / 70 to 65 / 35.

The present application relates to the technical field of functional film, in particular to a functional film with controllable adhesive property and preparation method thereof.The functional film comprises a film substrate, a pressure-sensitive adhesive layer coated on the film substrate, and a release film layer temporarily attached to the pressure-sensitive adhesive layer.The functional film has the property of increasing adhesive property after ultraviolet irradiation, and the ratio of the peeling force F2 after ultraviolet irradiation to the peeling force F1 before ultraviolet irradiation is greater than 5.The current on the adhesive surface of the functional film prepared by the present application is 10-1000 pA, and the through current is 50-500 pA.Compared with the prior art, the functional film prepared by the present application has controllable current on the adhesive surface and through current, excellent electrical performance, avoids the problems of current accumulation in the adhesive layer, interference with signal transmission accuracy, and local overheating, and improves the application safety of the material.

The invention discloses an intrinsic flame-retardant recoverable thermosetting polymer foam material and a preparation method thereof, and belongs to the technical field of thermosetting polymers. The material is prepared by taking an epoxy resin monomer, a pre-curing agent, thermal decomposition type phosphate, a foam stabilizer, a nucleating agent and a catalyst as raw materials and adopting a two-step foaming process. At low temperature, the epoxy resin monomer and the pre-curing agent are pre-cured to form an initial cross-linked network so as to regulate and control the viscosity of the system. During high-temperature curing, the thermal decomposition type phosphate is decomposed to generate phosphoric acid and gas, and the gas serves as a foaming gas source; phosphorus hydroxyl groups of phosphoric acid react with epoxy groups to form dynamic phosphate ester bonds, and a dynamic covalent network is constructed. The thermal decomposition type phosphate has triple effects of a foaming agent, a dynamic cross-linking agent and an intrinsic flame retardant. The foam stabilizer and the nucleating agent regulate the pore size of the foam, the catalyst reduces the curing temperature and prevents internal carbonization of the foam, and the prepared material has recoverable and intrinsic flame retardant properties.

The invention provides a polyamide acid solution edge sealing process, and relates to the technical field of novel edge sealing in the photovoltaic silk screen printing plate industry. The prepared epoxy resin solution is poured into a blade coating jig, then the cleaned screen printing plate is placed on a coating table, the printing face faces outwards, and blade coating is conducted on the printing face once. Then the screen printing plate is pre-cured for 1 hour at the normal temperature, and the step is as follows: 1, the epoxy resin solution can more uniformly permeate into meshes of the metal wire mesh, so that the surface is prevented from being influenced by air blowing of a subsequent high-temperature baking oven; and then the screen printing plate is put into an oven at the temperature of 80 DEG C + / -5 DEG C to be baked for 40 min. And finally, the protective film on the PI film on the printing surface of the screen printing plate is torn off after curing. The cured resin has a flat and smooth surface, is not brittle and crack, can be soaked in butanone for 20min, is not dissolved, can be backwashed by using NMP, has good reworkability, is relatively simple in preparation and coating processes of a phenolic resin solution, is easy to operate, reduces the labor cost and error rate, and improves the production efficiency due to high curing speed.

The invention relates to a surface protective film. Provided is a surface protective film suitable for achieving both good hand-tearing properties and high reworkability while having a polyester-based base material. The surface protective film (X) of the present invention has a laminated structure including a base material (11) as a transparent base material and an adhesive layer (12). The base material (11) is a uniaxially stretched polyester-based base material having a thickness of 75 [mu] m or more in the width direction of the base material. The Elmendorf tear strength of the surface protective film (X) in the substrate width direction is 0.5 N or less, and the Elmendorf tear strength of the surface protective film (X) in the substrate length direction is 1 N or more.

Provided are a thermally conductive sheet having excellent adhesion to electronic components, operability, and reworkability, and a method for manufacturing the same and a method for mounting the thermally conductive sheet. The sheet has a sheet body 2 formed by curing a binder resin, the binder resin at least containing a polymer matrix component and a fibrous thermally conductive filler 10, the volume ratio of the fibrous thermally conductive filler 10 to the binder resin being 0.6 or less when the binder resin is set to 1, and the fibrous thermally conductive filler 10 protrudes from the surface of the sheet body 2 and is covered with an uncured component of the binder resin.

The invention discloses a polyvinyl acetate resin modified polyurethane dispersoid and a preparation method thereof, and belongs to the technical field of organic synthesis.The polyvinyl acetate resin modified polyurethane dispersoid is prepared by modifying the surfaces of polyvinyl acetate resin particles subjected to surface hydroxylation treatment with furan and maleimide derivatives respectively; doping the surface furan modified polyvinyl acetate resin particles and the surface maleimide modified polyvinyl acetate resin particles into polyurethane, and heating to enable furyl groups and amide groups on the surfaces of the particles to be subjected to D-A reaction (Diels-Alder reaction); thus, the doped resin particles are linked in polyurethane to form a net structure, and the whole polymer dispersion system is hardened; under heating or strong shear stress, furyl and amide groups which have been subjected to D-A reaction among resin particles in polyurethane are subjected to inverse D-A reaction for ring opening, so that a resin particle network in a corresponding area is disintegrated, and the polyvinyl acetate resin modified polyurethane dispersion is softened.

The invention discloses a preparation method and application of a vanillin-based chain extender and a waterborne polyurethane film-forming agent, and belongs to the technical field of waterborne polyurethane preparation.The preparation method comprises the steps that firstly, vanillin and 4, 4-diaminodiphenylmethane are subjected to a Schiff base reaction to synthesize the vanillin-based chain extender, then the vanillin-based chain extender reacts with isocyanic acid and polyhydric alcohols to generate a prepolymer, and then the prepolymer is subjected to a reaction with the waterborne polyurethane film-forming agent to obtain the vanillin-based chain extender. Then synthesizing a waterborne polyurethane emulsion through an emulsification reaction, adding an amine chain extender after emulsification, and carrying out a post-chain extension reaction, so as to obtain the waterborne polyurethane film-forming agent. The waterborne polyurethane film-forming agent prepared by the invention can be used for preparing a glass fiber wire-drawing impregnating compound, a fabric sizing agent or a coating and the like, the film-forming agent is environment-friendly, the production process is green and pollution-free, an organic solvent does not need to be added in the reaction process, and zero VOC (Volatile Organic Compounds) emission can be realized; meanwhile, the special structure of the vanillin-based chain extender also endows the waterborne polyurethane film-forming agent with higher rigidity.

The present invention provides a liquid crystal alignment agent that can form a liquid crystal alignment film with less afterimages from residual DC and AC afterimages, easy reprocessing, and high transmittance. The liquid crystal alignment agent of the present invention is characterized in that it contains the following (A) components and (B) components. (A) component: a polymer (A) having a repeating unit represented by the following formula (1). (B) component: a polymer (B) having a repeating unit represented by the following formula (2) and a repeating unit represented by the following formula (3). (X1 is a tetravalent organic group; Y1 is a divalent organic group; X2 and X3 are tetravalent organic groups derived from alicyclic tetracarboxylic dianhydride or non-cyclic aliphatic tetracarboxylic dianhydride; R2 is a hydrogen atom, etc.; Z 21 , Z 22 , Z 31 , Z 32 is a hydrogen atom, etc.; Y3 is a divalent organic group having a partial structure represented by the following formula (n); R3 is a hydrogen atom, etc.; Q2 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; Q3 is a hydrogen atom or an alkyl group having 1 to 3 carbon atoms; * is a bonding bond. )

The utility model relates to the technical field of cutting devices, and discloses a baseball cap visor cutting device which comprises a machining table, a fixing frame is fixedly connected to the middle of the machining table, lead screws are rotationally connected to the left side and the right side of the machining table respectively, belt wheels are fixedly connected to the other ends of the lead screws, and synchronous belts are arranged on the outer sides of the two belt wheels. A first motor is fixedly installed at the left end of the front side of the machining table, the left lead screw is fixedly connected to the output end of the first motor, the front end of the outer side of the lead screw is in threaded connection with a moving block, the top end of the moving block is rotationally connected with a pushing brush, and a hole groove is formed in the side, close to the moving block, of the pushing brush. According to the cutting table, scraps and leftover materials remaining on the surface of the machining table can be conveniently cleaned, accumulation of the leftover materials is reduced, the phenomenon that the sight is blocked during work due to accumulation of the leftover materials is reduced, cutting efficiency is improved, manual cleaning is not needed, and the cutting table is convenient to use.

The invention provides a decorative explosion-proof membrane with liquid crystal colors, and relates to the field of glass and panel decoration. The hardened coating comprises 15%-25% of a toluene solvent, 18%-22% of an ethyl ester solvent, 16%-20% of a ketone solvent, 32%-45% of an acrylate prepolymer, 20%-35% of an acrylate monomer, 12%-25% of polymethyl methacrylate particles, 0.5%-3% of photoinitiators (two types of 184 and TPO) and 0.1%-1% of an auxiliary agent. The preparation method comprises the following steps: uniformly mixing the acrylate monomer and the solvent; according to the decorative explosion-proof film with the liquid crystal color, optical-grade PET, PC, PVC, TPU and other materials are selected as base materials, the surface of the base material is coated with a high-adhesive-force coating, the adhesive force of the coating to PET can reach 5B, the polarity of the surface of the coating is high, the coating has excellent adhesive force to printing ink, UV transfer printing glue, electroplating and the like, and the problem that when a decorative film is used as a printing coating, the surface of the coating is not prone to being damaged is effectively solved. The coating is easy to fall off and fade after being subjected to an aging test or used for a long time.

The present invention provides a double-sided adhesive tape which has excellent initial adhesion to an adherend, can be sufficiently stretched, is not easily broken even when sufficiently stretched, can be smoothly pulled off from the adherend in a stretched state, and has excellent reworkability. A double-sided adhesive tape in an embodiment of the present invention comprises an adhesive layer (B1), a substrate layer (A) and an adhesive layer (B2) in this order, wherein the adhesive layer (B1) and the adhesive layer (B2) each contain at least one selected from the group consisting of an acrylic adhesive and a rubber adhesive, and the acrylic adhesive contains a filler, the substrate layer (A) contains at least one selected from the group consisting of a polyolefin, a thermoplastic polyurethane and a styrene polymer as a resin component, the adhesive layer (B1) and the adhesive layer (B2) each have an initial adhesive force of 5 N / 10 mm or more, the initial adhesive force being the initial adhesive force to a SUS plate under the conditions of a peel angle of 180 degrees and a peel speed of 300 mm / min under an environment of 23° C. and 50% RH specified in JIS-Z-0237-2000, and the double-sided adhesive tape has an elongation at break of 600% or more as measured by the “elongation” measurement method specified in JIS-K-7311-1995.

The embodiment of the utility model discloses a packaging structure of a soft package battery pack, and relates to the technical field of packaging, and the packaging structure comprises a supporting structure which comprises a cavity; wherein the cavity is used for containing the soft package battery pack, and under the condition that the soft package battery pack is placed in the cavity, the first end face of the soft package battery pack is opposite to the bottom face of the supporting structure; the at least one glue injection hole is formed in the side wall of the supporting structure so as to communicate the cavity with the outside; wherein the lower edge of the glue injection hole is located in a preset area of the side wall of the supporting structure, the preset area is an area limited by the orthographic projection of the first end face on the side wall and the orthographic projection of the plane where the interface of the sealing edge and the tab is located on the side wall, the sealing edge is arranged on the first end face, and the tab is arranged on the sealing edge; and the pouring sealant is filled in a gap between the plane where the lower edge of the glue injection hole is located and the bottom surface of the supporting structure through the at least one glue injection hole. The packaging structure of the soft package battery pack provided by the embodiment of the utility model can improve the waterproof performance.

The invention provides a double-sided adhesive tape, a preparation method thereof and an electronic device comprising the same. Specifically, the double-sided adhesive tape sequentially comprises a first pressure-sensitive adhesive layer, a polyamide layer, a polyurethane foam layer, a polyester layer and a second pressure-sensitive adhesive layer. The electronic equipment (such as a display and the like) adhered by the double-sided adhesive tape according to the technical scheme of the invention has good reworking performance, and the double-sided adhesive tape also provides excellent aging resistance (such as high temperature and high humidity resistance).

The present invention relates to an oriented liquid crystal film in which liquid crystal molecules are oriented, a method for manufacturing the same, and an image display device having the oriented liquid crystal film. The oriented liquid crystal film is made of a liquid crystal layer in which liquid crystal molecules are oriented in a predetermined direction, and contains two or more compounds. The oriented liquid crystal film contains a polymer of at least one photopolymerizable liquid crystal compound. The oriented liquid crystal film preferably has a ratio of a horizontal load at a depth of 30 nm from the surface to a maximum horizontal load at a depth of 15 nm from the surface within a predetermined range. The oriented liquid crystal film is obtained, for example, by coating a liquid crystal composition containing at least one photopolymerizable liquid crystal compound and other compounds on a film substrate, aligning the liquid crystal molecules in a predetermined direction, and then polymerizing or cross-linking the liquid crystal compound.