Polylactic acid and preparation method of copolymer support

• Main Authors: CHEN SHUGUO, LUO QIYI, CHEN BAO'AI, MENG JUAN
• Format: Patent
• Language: Chinese; English
• Published: 11.05.2018
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, ORSURGICAL ARTICLES; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; HUMAN NECESSITIES; HYGIENE; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICALARTICLES; MEDICAL OR VETERINARY SCIENCE; METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS INGENERAL; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

The invention provides polylactic acid and a preparation method of a copolymer support. The preparation method comprises the following steps that 1), a biodegradable polymer original tube is preparedby biodegradable polymer materials; 2), the original tube is put into a tubular mold for heating, and high-pressure gas is injected into the original tube, so that the tube can be highly oriented in the radial direction, and the tube is axially stretched in the axial direction of the tube, so that the simultaneous orientation of the tube in the radial direction and the axial direction is realized;3), an expanded tube is placed at an annealing temperature for 5-30 minutes to anneal so as to obtain the formed tube, wherein the annealing temperature is higher than the glass transition temperature of the polymer materials and is lower than the melting temperature of the polymer materials; and 4) the formed tube is prepared into the polylactic acid and the copolymer support. According to the method, the immediate suppo