Polyurethane elastic fiber with ultrasonic bonding performance and preparation method thereof

Abstract

The invention relates to a polyurethane elastic fiber with an ultrasonic bonding performance. The polyurethane elastic fiber contains a polymer A, wherein the polymer A contains a structural formula I and a structural formula II of the following units, wherein R in the formula I and the formula II is independently selected from hydrogen group, alkyl group, alkoxy group, hydroxyl group, halogen, amino group, amino group, nitro group or sulfonic acid group; in the formula I, a saturated or unsaturated aliphatic hydrocarbon group of C2-C18 is used; the mass of the structure in the formula I accounts for 1 to 25 percent of the total mass of the polymer A; the balance is the mass of the structure shown in the formula II, and the polymer A accounts for 0.5 to 15 percent of the mass of the polyurethane elastic fiber; and the thermal compatibility and the adhesiveness of the polyurethane elastic fiber and non-woven fabrics or other textiles are improved under the condition of an ultrasonic welding process and on the premise that no glue is used.

Description

Technical field [0001] The present invention relates to a method of preparing a polyurethane elastic fiber, involving a polyurethane elastic fiber having adhesive properties and a method of preparation thereof, and a method of preparing a polyurethane elastic fiber imparting excellent ultrasonic adhesive properties. Background technique [0002] When the diaper, mask and other plants are produced, the elastic rubber wire is bonded to the non-woven fabric, in order to ensure that the firmness of the connection is large, the glue is used, but also adds production costs, but also increases The weight and hardness of the material product affects the comfort of the product, and it is not environmentally friendly to use glue. It has strong irritation to the skin of the human body and poor breathable. The ultrasonic welding method is to use an ultrasound generator to heat intimidate internal bonding in the non-woven fabric of the sealing site to achieve a sealing effect. This type of se...

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Problems solved by technology

At present, the common preparation methods are mainly based on physical modification, such as adding polypropylene and polyethylene powder to polyurethane elastic fibers, and using polypropylene and polyethylene in elastic fibers to improve their compatibility with non-woven fabrics, while spandex uses The solvent is an aprotic polar solvent. If non-polar polymers such as polypropylene and polypropylene are added to polyurethane materials without modification, they will have inherent defects in mixing with fibers, which will affect spinning and material properties.

Patent US2018027042 discloses a method for preparing elastic fibers with reduced surface friction and viscosity, which improves the thermal viscosity with non-woven fabrics by adding powdered polypropylene and polyethylene to the polyurethane spinning stock solution; patent CN112662074A discloses A polypropylene / polyurethane alloy material and a preparation method thereof, the alloy material has certain polar group amide bonds by adding polyurethane, and reacts chemically with the amide bonds in nylon during vibration friction, and can be used in vibration friction welding It can greatly improve the welding strength of polypropylene material and nylon material; patent CN112726022A should open a kind of preparation method of polypropylene-polyethylene composite non-woven fabric, this preparation method reduces the melting point of needle-punched non-woven fabric, improves Composite non-woven fabric and fiber ultrasonic bonding strength and cloth surface uniformity; CN111499974A discloses a modified polypropylene resin with high ultrasonic welding strength, to solve the low utilization rate of existing polypropylene resin welding energy, less heat production, Problems leading to low ultrasonic welding strength of polypropylene resin

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