JIANGYIN HUAHONG CHEMICAL FIBER CO., LTD. company cases

Molecular structure: Both are modified polyesters, but they have different monomer compositions. Cationic dyeable polyester is usually a ternary copolymer obtained by adding a third monomer (such as sodium dimethyl isophthalate - 5 - sulfonate) during the polycondensation of polyethylene terephthalate. ECDP is a quaternary copolymer, which is obtained by further adding a fourth monomer (such as polyethylene glycol, dimethyl isophthalate, adipic acid, 1,4 - butanedioic acid, etc.) on the basis of the ternary copolymer. The introduction of the fourth monomer in ECDP changes the molecular chain structure, making it more conducive to cationic dyeing. Dyeing conditions: Cationic dyeable polyester generally needs to be dyed at a temperature of about 120°C or under pressure. In contrast, ECDP can be dyed under normal pressure and boiling conditions, that is, at about 100°C. This is because the molecular structure of ECDP is more open and loose, and the dye molecules are easier to penetrate into the fiber, so it can achieve good dyeing results at a lower temperature and pressure. Dyeing effect: Both can be dyed with cationic dyes to obtain bright colors. However, due to the special molecular structure of ECDP, it has a higher color absorption rate and can show more vivid and deep colors. At the same time, the color fastness of ECDP is also relatively good, and it can maintain bright colors after multiple washes and usages. Production process: The production of cationic dyeable polyester only requires the addition of a third monomer in the polymerization process. While the production of ECDP requires the addition of a fourth monomer on the basis of the third monomer, and the control of the polymerization process is more complex. For example, in the production of ECDP, the selection and dosage of the fourth monomer, as well as the reaction temperature, time and other parameters, need to be strictly controlled to ensure the performance of the product. Performance and application: In addition to dyeing performance, ECDP has some other excellent properties. For example, it has better hygroscopicity and antistatic properties, and the fabric made of it is more comfortable to wear. These properties make ECDP more widely used in the textile industry, especially in the production of high - end clothing, home textiles and other products. Cationic dyeable polyester is also widely used, but in some fields where higher dyeing requirements and comfort are required, ECDP has more advantages.

Dye types: Cationic dyeable polyester: As the name suggests, it is designed to be dyed with cationic dyes. These dyes are positively charged and can form ionic bonds with the negatively charged groups introduced into the polyester during its modification, resulting in bright and vivid colors with high color fastness. Traditional polyester: Usually requires disperse dyes for dyeing. Since traditional polyester has a compact molecular structure and lacks polar groups, disperse dyes, which are small - molecule non - ionic dyes, are used. They enter the polyester fiber through diffusion and mechanical occlusion. Dyeing temperature: Cationic dyeable polyester: Can be dyed at a relatively lower temperature, typically around 100 - 110°C. The modified structure of the fiber allows the cationic dyes to penetrate and bond with the fiber at this temperature range, reducing energy consumption and potential damage to the fabric. Traditional polyester: Generally requires a higher dyeing temperature, usually around 130°C. The high - temperature environment is necessary to increase the mobility of the polyester molecules and enable the disperse dyes to diffuse into the fiber. Use of auxiliaries: Cationic dyeable polyester: May require specific auxiliaries to assist in the dyeing process. These auxiliaries can help adjust the pH of the dye bath, promote the dissolution and dispersion of cationic dyes, and improve the dye - uptake rate and color uniformity. For example, some leveling agents may be used to ensure even dye distribution. Traditional polyester: When using disperse dyes, auxiliaries such as dispersing agents are crucial. They help to evenly disperse the insoluble disperse dyes in the dye bath and prevent dye aggregation. Additionally, carriers may be added in some cases to enhance the dye - uptake of polyester at lower temperatures. Dyeing process: Cationic dyeable polyester: The dyeing process is relatively simple. After preparing the dye bath with the appropriate cationic dyes and auxiliaries, the fabric is immersed in the bath, and the temperature is gradually raised to the desired dyeing temperature. The dyeing time is usually shorter compared to traditional polyester, typically around 30 - 60 minutes, depending on the depth of color and fabric type. Traditional polyester: The dyeing process is more complex. It often involves pre - treatment of the fabric to remove impurities and improve its wettability. Then, the fabric is dyed in a high - temperature and high - pressure dyeing machine with carefully controlled temperature and time profiles. The dyeing time is usually longer, ranging from 60 - 120 minutes, followed by post - treatment processes such as washing and soaping to remove unfixed dyes and improve color fastness.

Composition and Structure Properties Production Process Applications

Increasing market demand1 Growing consumer awareness: As consumers become more environmentally conscious, especially the younger generation, there is a rising preference for sustainable and eco - friendly textile products. Recycled polyester staple fiber, which meets the requirements of environmental protection, is expected to see a significant increase in market demand. Stringent environmental regulations: With the strengthening of global environmental regulations, the textile industry is under increasing pressure to reduce environmental impact. This will prompt textile enterprises to use more recycled polyester staple fiber to meet regulatory requirements and enhance their environmental image. Technological innovation and quality improvement Advancements in recycling technology: Continuous innovation in recycling technology is improving the quality and performance of recycled polyester staple fiber, making it closer to or even on a par with virgin polyester fiber. For example, new processes are being developed to increase the purity of recycled polyester and improve its dye - ability and mechanical properties. Product diversification: Manufacturers are focusing on developing new types of recycled polyester staple fiber with special properties, such as colored multi - groove recycled polyester staple fiber. This kind of fiber not only has unique physical structures but also performs well in terms of low defect content and other indicators, meeting the needs of different application scenarios in the textile industry. Expansion of application areas Traditional textile fields: In addition to the continued expansion in the clothing and home textile industries, recycled polyester staple fiber is also expected to be increasingly used in high - end fashion and professional sports - wear. Its moisture - wicking, quick - drying, and antibacterial properties make it suitable for sports - wear, while its improved appearance and texture make it suitable for high - end fashion. Emerging application fields: With the development of the circular economy, recycled polyester staple fiber is gradually expanding into emerging fields such as automotive interiors, medical textiles, and geotextiles. For example, in the automotive industry, it is used to make seat covers, headliners, and carpets; in the medical field, it can be used to make non - woven fabrics for medical dressings and protective clothing. Industrial chain integration and cooperation Upstream and downstream cooperation: To ensure a stable supply of raw materials and improve production efficiency, enterprises in the recycled polyester staple fiber industry are increasingly focusing on integrating the industrial chain. Upstream raw material suppliers, recycling processors, and downstream textile manufacturers are cooperating closely to jointly promote the development of the industry. For example, some large - scale textile enterprises work with waste recycling companies to ensure the quality and quantity of waste polyester raw materials. International cooperation: Given the global nature of the textile industry, international cooperation in the recycled polyester staple fiber sector is also on the rise. Countries are sharing recycling technologies and experiences, jointly formulating international standards and norms, and promoting the global development of the recycled polyester staple fiber industry. Cost - effectiveness improvement Reduced production costs: As the scale of the recycled polyester staple fiber industry expands and recycling technologies mature, production costs are gradually decreasing. The cost - effectiveness of recycled polyester staple fiber is expected to improve, making it more competitive with virgin polyester fiber and other traditional textile materials. Increased economic benefits: Besides reducing production costs, the use of recycled polyester staple fiber can also bring additional economic benefits to enterprises, such as through government subsidies for environmental protection - compliant products and the potential for higher sales prices due to the growing demand for sustainable products.

Reducing waste: It helps divert waste polyester products from landfills or incineration. For instance, discarded PET bottles, which would otherwise take hundreds of years to decompose in landfills, can be collected and recycled into polyester staple fiber. This significantly reduces the volume of waste occupying landfills and decreases the environmental pollution and resource waste caused by incineration. Saving energy: The production of recycled polyester staple fiber consumes less energy compared to that of virgin polyester. The process of recycling polyester requires fewer steps and lower temperatures than starting from raw materials. It is estimated that recycling polyester can save about 50% - 70% of the energy needed for producing virgin polyester, thereby reducing carbon emissions and conserving non - renewable energy sources. Lowering carbon emissions: Due to the reduced energy consumption in the production process, the use of recycled polyester staple fiber leads to lower carbon dioxide emissions. This helps mitigate climate change by reducing the amount of greenhouse gases released into the atmosphere. Every ton of recycled polyester produced can save approximately 5.5 tons of carbon dioxide emissions compared to the production of virgin polyester. Conserving natural resources: By recycling polyester, we decrease the need for raw materials such as petroleum, which is the main feedstock for virgin polyester production. This helps conserve finite natural resources and reduces the environmental impact associated with the extraction and processing of these raw materials, including habitat destruction and water pollution.

Raw material selection: The quality of recycled polyester staple fiber highly depends on the quality of the raw materials. High - quality waste polyester products, such as discarded PET bottles and textile waste, should be selected. These raw materials should be free from excessive contamination, have a relatively uniform composition, and a high content of polyester. For example, when collecting waste PET bottles, those with labels and caps removed are preferred to reduce impurities. Production process control Sorting and cleaning: The collected waste polyester materials are first sorted to remove non - polyester materials and impurities. Then, they are thoroughly cleaned to remove dirt, grease, and other contaminants. This step is crucial as any remaining impurities can affect the quality of the final product. For example, using high - pressure water jets and specialized cleaning agents can effectively clean the surface of waste polyester bottles. Melting and extrusion: The sorted and cleaned waste polyester is melted at a suitable temperature. The melting temperature and time should be strictly controlled to ensure the uniformity of the molten material. Then, the molten polyester is extruded through a spinneret to form fibers. The extrusion process should maintain a stable pressure and flow rate to ensure the consistency of the fiber diameter and shape. Drawing and texturing: The as - spun fibers are then drawn to increase their strength and orientation. The drawing ratio and temperature should be optimized to achieve the desired mechanical properties of the fibers. After drawing, texturing can be carried out to give the fibers a certain degree of crimp and softness, improving their textile - processing performance. Quality testing: Comprehensive quality testing is essential to ensure the quality of recycled polyester staple fiber. Physical property testing: This includes testing the fiber's length, fineness, strength, elongation, and bulkiness. These properties affect the fiber's processing performance and the quality of the final product. For example, the strength and elongation of the fiber should meet certain standards to ensure that the textile products made from it have sufficient durability. Chemical property testing: The chemical composition of the recycled polyester staple fiber should be analyzed to ensure that it meets the requirements of polyester. Impurities and additives should be within the allowable range. In addition, the thermal stability and dye - ability of the fiber are also important chemical properties to be tested. For example, good dye - ability ensures that the fiber can be dyed into various colors evenly. Appearance quality inspection: The appearance of the fiber, including its color, luster, and the presence of defects such as knots and breaks, should be inspected. A uniform color and luster, as well as the absence of obvious defects, are important indicators of good - quality fibers.  

Textile and Apparel Industry Clothing Manufacturing: It is used to make various types of clothing, such as T - shirts, sweaters, and sportswear. Brands are increasingly inclined to use recycled polyester staple fiber to demonstrate their commitment to environmental protection. For example, some well - known sportswear brands produce sportswear using recycled polyester staple fiber, which not only has good performance but also meets consumers' demand for sustainable fashion. Fashion Accessories: It is also used in the production of fashion accessories like scarves, hats, and bags. The fiber can be processed into different textures and colors to meet the diverse design requirements of fashion accessories. Home Textile Industry Bedding: Recycled polyester staple fiber is used to make bed sheets, quilt covers, and pillowcases. It provides a soft and comfortable feel while also being durable and easy to care for. Upholstery: In the production of furniture upholstery, this fiber is used to make sofa covers, chair cushions, and curtains. It can enhance the durability and stain - resistance of upholstery fabrics, and its appearance and performance are no less than those of traditional fabrics. Industrial Applications Geotextiles: Recycled polyester staple fiber is made into geotextiles, which are used in civil engineering projects such as road construction and landfills. They help with soil reinforcement, separation, filtration, and drainage. For example, in road construction, geotextiles made of recycled polyester staple fiber can improve the stability of the roadbed and extend the service life of the road. Filtration Materials: It is used to produce air - filtration and liquid - filtration materials. In air - conditioning systems and air purifiers, recycled polyester staple fiber - based filters can effectively capture dust and particulate matter. In water treatment plants, it is used to filter out impurities and pollutants in water. Packaging Materials: Some recycled polyester staple fiber is used to make packaging materials, such as cushioning materials and packaging straps. The cushioning materials can protect fragile items during transportation, while the packaging straps are strong and durable, suitable for binding and packaging goods. Other Fields Filling Materials: It is widely used as filling for pillows, mattresses, and toys. The recycled polyester staple fiber has good elasticity and softness, which can provide comfortable support and a pleasant touch. Insulation Materials: After special treatment, recycled polyester staple fiber can be used as insulation materials in the construction industry and electrical equipment. It has good thermal insulation and electrical insulation properties, which helps to improve energy efficiency and ensure safety.