10 results about "Solvent bonding" patented technology

The invention provides polyurethane serving as a hot melt adhesive and alcosol water as well as a preparation method and application thereof, and relates to the technical field of polyurethane binders. The preparation method comprises the following steps: mixing polydihydric alcohol, diisocyanate, an organic solvent and a catalyst to carry out polymerization reaction, and then mixing with chain extenders (dihydric alcohol containing 2-ureido-4-pyrimidone groups and dihydric alcohol containing bipyridine groups) to carry out chain extension reaction to obtain polyurethane. According to the invention, 2-ureido-4-pyrimidone and dipyridyl groups are introduced into a macromolecular chain of polyurethane, and a formed hydrogen bond can provide strong intermolecular cohesion in the adhesive, so that the strength of the material is improved, and the adhesive force with the surface of a base material can be enhanced; the bipyridine group can form a chelating structure with metal ions on the surface of a metal substrate, so that the bonding strength with the metal substrate is enhanced. According to the invention, a single polyurethane material has dual functions of hot-melt bonding and normal-temperature green solvent bonding, and has excellent bonding performance and milder bonding conditions.

Provided is an olefin-based heat-shrinkable multilayer film that is substantially free of a cyclic olefin-based resin, is easy to use for solvent bonding and gravity separation, and has excellent heat shrinkability and transparency.　The olefin-based heat-shrinkable multilayer film comprises a first surface layer and a second surface layer, which are derived from a polystyrene-based resin, and an intermediate layer derived from a polyolefin-based resin, wherein (a) the polystyrene-based resin contains at least 50 wt% of a styrene-butadiene copolymer, (b) the crystal melting enthalpy of the intermediate layer is set to a value of 135 mJ / mg or less, (c) the thermal shrinkage rate in the TD direction is 50-80% under the shrinkage conditions of 100°C and 10 seconds, (d) the haze value is 10% or less, and (e) the specific gravity is 0.95 or less.

The medical tubing may have a continuous inner layer with a continuous outer layer thereon, where the inner layer comprises a polyolefin, such as polyethylene or polypropylene or a functionalized polyolefin. The outer layer may include a thermoplastic polymer, for example, including one or more or a mixture of a thermoplastic polyurethane (TPU), a thermoplastic olefin (TPO), a thermoplastic elastomer (TPE), a styrene-containing thermoplastic elastomer (S-TPE), a polyolefin elastomer (POE), a styrene block copolymer (SBC). Advantageously, the outer layer and / or the inner layer do not comprise polyvinyl chloride. Such tubing may be readily solvent bonded to a medical connector and used with an infusion kit.

The application relates to the technical field of sports goods, and discloses a butyl inner liner PU pasting skin football based on high sealing performance and a preparation process thereof. The butyl inner liner is used to replace a traditional rubber inner liner, the air tightness is improved by more than 60%, the air preservation time is prolonged to more than 30 days without the need of inflation, the modified EVA film is used as a buffer layer, the football has soft touch and excellent resilience, and is not easy to deform after strong impact, the enhanced coating formula is used to improve the tensile strength of the pasting cloth by more than 40%, and the inner liner spherical structure is effectively maintained, the high-viscosity hot melt adhesive bonding layer is used, the peeling strength between the shell and the inner liner is improved by more than 50%, and the delamination is effectively prevented, the butyl rubber sealing rubber strip is arranged at the joint, and the air leakage hidden danger of the joint is completely eliminated, the thickness of each layer of material is accurately controlled, the football weight distribution is ensured to be uniform, and the flight stability is significantly improved, and the preparation process uses hot-pressing compounding to replace solvent bonding, no organic solvent residue is left, and the process is environment-friendly and safe.

The application provides a polyurethane serving as a hot melt adhesive and an alcohol-soluble adhesive, and a preparation method and application thereof, and relates to the technical field of polyurethane adhesives.The polyurethane is obtained by mixing polyglycol, diisocyanate, an organic solvent and a catalyst to perform a polymerization reaction, and then mixing a chain extender (a glycol containing a 2-ureido-4-pyrimidone group and a glycol containing a bipyridine group) to perform a chain extension reaction.The 2-ureido-4-pyrimidone and the bipyridine group are introduced into the high molecular chain of the polyurethane, the hydrogen bond formed by the 2-ureido-4-pyrimidone and the bipyridine group can provide strong intermolecular cohesive force inside the adhesive, improve the strength of the material itself, and can enhance the adhesion to the surface of a base material;the bipyridine group can form a chelate structure with metal ions on the surface of a metal base material, and can enhance the bonding strength to the metal base material.The application realizes that a single polyurethane material has the dual functions of hot melt bonding and room-temperature green solvent bonding, and has excellent bonding performance and more moderate bonding conditions.

The utility model discloses a kind of welding mould injection devices for contact lens assembly cup, the device is based on operation platform, material tray is equipped in upper left side, right side has conveying belt and storage tray, first layer encapsulation, puncture injection piece and second layer encapsulation are sequentially arranged on conveying belt, complete the encapsulation and injection process to assembly cup, conveying belt two sides are respectively configured with feeding assembly and discharging assembly, by the cooperation of transverse slide rail, longitudinal guide rail and transmission motor, realize efficient accurate material handling, there is contact lens placing cavity in the cup group where assembly cup is, lower encapsulation table and top encapsulation table are respectively equipped, and with corresponding film sealing, in addition, encapsulation table is equipped with antiskid line, cup group has bending line, the device structure design is reasonable, can effectively improve the production efficiency of contact lens assembly cup, ensure encapsulation quality, satisfy large-scale production demand, with remarkable practical value.

Provided is an olefin-based heat-shrinkable multilayer film that is substantially free from the incorporation of a cyclic olefin-based resin, and that is easy to solvent bond and gravity separate, and has excellent heat shrinkability, transparency, etc. The olefin-based heat-shrinkable multilayer film comprises a first surface layer and a second surface layer derived from a polystyrene-based resin, and an intermediate layer derived from a polyolefin-based resin, and wherein (a) the polystyrene-based resin contains 50% by weight or more of a styrene-butadiene copolymer, (b) the crystalline melting enthalpy of the intermediate layer is 135 mJ / mg or less, (c) the thermal shrinkage rate in the TD direction when shrunk at 100°C for 10 seconds is 50 to 80%, (d) the haze value is 10% or less, and (e) the specific gravity is 0.95 or less.

The disposable physical connection blood pipeline comprises a vein pot, an artery pot and a spiral connector, one end of the vein pot is connected with the end of the pipeline through a first connecting assembly, the other end of the vein pot is connected with a vein pot cover, and the two ends of the artery pot are each connected with a first two-way connector. Wherein one first two-way connector is connected with the vein kettle cover through a second connecting assembly, the other first two-way connector is connected with a third connecting assembly, and the other end of the third connecting assembly is connected with the spiral connector through a pipeline. Chemical reagents and dead corners do not exist on the bonding inner wall of the blood pipeline and the connector, the ends of the three-way connector and the two-way connector are folded inwards and compacted on the connector, pipeline connection is achieved, ketone chemical solvent bonding is thoroughly eliminated, and the problems that chemical reagents are left on the inner wall of a traditional blood transfusion pipeline, the use safety of a patient and the environment are low are solved. And moreover, an annular positioning bulge is designed to be matched with a clamping groove, so that the sealing effect is better.

An infusion assembly comprising a tube (1), a connector (20a, 20b) comprising a connection portion (200a, 200b) configured to be engageable with the tube (1), and an adhesive (30) adapted to solvent bond the connection portion (200a, 200b) with the tube (1) wherein the connection portion (200a, 200b) comprises a receiving surface (202a, 202b) for receiving the adhesive (30). The adhesive (30) includes a polar solvent and a styrene block copolymer.

A laminator for high precision solvent bonded delay films is disclosed. The laminator is capable of producing laminates with high orientation repeatability and low in-plane stress that can otherwise create a gap between the best theoretical performance and the physically achievable performance. The batch mode laminator is scalable to large area master sheets and is suitable for high volume manufacturing.