香港最快现场直播45碳纤维研究成果简介

近年来，香港最快现场直播45在高强度、高模量碳纤维制备技术研发与工程化开展工作并取得如下主要成果：

1、丙烯腈水相沉淀聚合制备技术开发与工程化

采用具有自主知识产权的丙烯腈水相沉淀聚合技术制备出了分子结构可控、分子量10´10^4～30´10^4g/mol、分子量分布≤3.5的高品质原丝聚合物，并实现了连续化聚合试验。该聚合技术具有反应周期短，聚合传质传热容易，产物纯净，适合规模化生产等特点。

2、高分子量、高固含量纺丝液连续溶解、输送与脱泡技术开发

采用具有自主知识产权的双螺杆挤出机制胶技术制备出了高分子量、高固含量的纺丝液。该技术利用双螺杆间强大的剪切、混合、啮合与强制输送能力，并在加热的促进下，实现了高分子量聚丙烯腈在二甲基乙酰胺中快速连续溶解和输送。利用双螺杆挤出机真空系统对真空度的灵活控制与双螺杆快速的液面更新的能力，实现了对高固含量、高黏度纺丝液输送过程中气泡的快速脱除。

3、基于二甲基乙酰胺溶剂体系的“干喷湿纺”原丝制备技术开发

利用香港最快现场直播45自行设计、建设的百吨级碳纤维原丝试验平台进行了“干喷湿纺”原丝制备技术开发工作。通过优化纺丝液物性与纺丝工艺，实现了高品质原丝的制备。目前，香港最快现场直播45自制原丝基本性能如下：单丝拉伸强度7.0～8.5cN/dtex，单丝拉伸模量100～130cN/dtex，断裂伸长率11%~13%，线密度≤1.75dtex。

4、高效预氧化与预氧丝结构调控技术开发

香港最快现场直播45自制原丝的预氧化反应起始温度可在210℃～230℃调节，实现低温环化氧化，减缓高温预氧化反应的集中放热，并利用自制预氧化装备的热风循环系统，将反应热即时带走，实现对预氧丝条温度的精准控制。通过预氧化炉张力系统，实现了对原丝预氧化过程中张力变化的实时监测和调控。通过对预氧丝物理化学结构的分析，建立了预氧丝结构与预氧化工艺之间的关系，为对预氧丝结构的精准调控提供了基础。目前，香港最快现场直播45自制的预氧化纤维主要指标如下：拉伸强度≥1.8 cN/dtex，断裂伸长率≥17.5%，体密度≥1.40 g/cm^3，线密度≥1.35 dtex，极限氧指数在40%-60%。

5、碳化工程化试验

香港最快现场直播45利用自制碳化装置对现有自制预氧丝进行了连续碳化试验，建立了预氧丝结构与碳丝结构遗传关系，摸索了碳化工艺对碳丝结构（聚集态结构、表观形貌等）的影响。目前，自制碳丝主要性能指标如下：单丝拉伸强度≥5.2GPa，单丝拉伸模量≥290GPa，断裂伸长率1.8%，体密度1.80g/cm^3，碳元素含量≥92%。

Research Achievements of Changchun University of Technology in the Field of Carbon Fiber

In recent years, Changchun University of Technology has been working on the research and engineering of high-strength and high-modulus carbon fiber preparation technology and has achieved the following major achievements:

1、Acrylonitrile aqueous phase precipitation polymerization technology

The aqueous phase precipitation polymerization technology of acrylonitrile with independent intellectual property rights has been invented to prepare high-quality protofilament polymers with controlled molecular structure, molecular weights of 10´10^4～30´10^4 g/mol and polydispersity index ≤3.5, and continuous polymerization tests have been realized. This polymerization technology has the features of short reaction period, excellent polymerization mass and heat transfer, pure products and suitable for large-scale production.

2、High molecular weight, high solid content spinning dope continuous dissolution, transport and defoaming technology

High molecular weight and high solid content spinning dope is prepared by twin-screw extruder technology with independent intellectual property rights. The technology makes use of the powerful shearing, mixing, meshing and forced conveying ability between twin screws, and is promoted by heating to achieve rapid and continuous dissolution and conveying of high molecular weight polyacrylonitrile in dimethyl acetamide. Using the flexible control of vacuum degree by the vacuum system of twin-screw extruder and the ability of rapid liquid level renewal of twin-screw, the rapid removal of air bubbles in the conveying process of high solid content and high viscosity spinning dope can be realized.

3、Dimethyl acetamide based "dry-jet wet spinning" precursor preparation technology

The development of "dry-jet wet spinning" precursor preparation technology was carried out using the 100-ton line designed and constructed by Changchun University of technology. Through the optimization of spinning dope properties and spinning process, the high-quality precursor fibers has been achieved. At present, the primary properties of precursor fibers made by Changchun University of Technology are as follows: monofilament tensile strength of 7.0～8.5 cN/dtex, monofilament tensile modulus of 100～130cN/dtex, elongation at break of 11%~13%, linear density of ≤1.75dtex.

4、Efficient pre-oxidation and the control of pre-oxidized fiber structures

The temperature of pre-oxidation reaction of precursors made by Changchun University of Technology can be adjusted at 210℃~230℃ to achieve low-temperature cyclization and oxidation, ease the concentrated exothermic heat of high-temperature pre-oxidation reactions, and by using the hot-air circulation system of the pre-oxidation equipment to take away the reaction heat instantly to achieve precise control of the temperature of the pre-oxidized fibers. Through the pre-oxidation tension system, real-time monitoring and regulation of tension changes in the pre-oxidation process of precursor fibers can be achieved. Through the analysis of the physical and chemical structure of the preoxidized fibers, the relationship between the structure of the preoxidized fibers and the preoxidation process was established, which provides the basis for the precise regulation of the structure of the preoxidized fibers. At present, the main indexes of preoxidized fibers made by Changchun University of Technology are as follows: tensile strength ≥1.8 cN/dtex, elongation at break ≥17.5%, bulk density ≥1.40 g/cm^3, linear Density ≥1.35 dtex, and limiting oxygen index at 40%-60%.

5、Carbonization engineering

Changchun University of Technology has carried out continuous carbonization tests on the self-made carbonization device, established the relationship between the structure of preoxidized fibers and the structure of carbon fibers, and investigated the influence of the carbonization process on the structure of the carbon fibers (aggregate structure, morphology, etc.). At present, the main indexes of self-made carbon fibers are as follows: monofilament tensile strength ≥5.2 GPa, monofilament tensile modulus ≥290 GPa, elongation at break 1.8%, bulk density 1.80 g/cm^3, and elemental carbon content ≥92%.