回收尼龙降解降解，扩链改性要注意这4个要点!
2022年07月06日
7724
指南
亮点速览
本文聚焦尼龙材料的庞大消费规模与可持续发展挑战。2021年中国尼龙总消费超500万吨，全球达千万吨级，数十年累计消耗达数亿至十亿吨。作为30年代问世的重要工程塑料，尼龙广泛应用于汽车、电子、医疗等领域，但其耐久性也导致大量废弃，带来环境压力。在此背景下，再生尼龙价值凸显：以再生尼龙66为例，性能媲美原生料，且可减少83%温室气体、82%能耗及57%用水。然而，回收过程易致分子链断裂、分子量下降，引发熔指升高、强度与耐热性衰减等问题。通过端基封端与链延伸技术（如反应性挤出），可有效恢复分子量与综合性能，提升再生料应用潜力与市场竞争力。
According to statistics, in 2021, the total consumption of nylon 6 chips in China will reach 4.127 million tons, and the consumption of nylon 66 will be about 640,000 tons. Adding other nylon categories, the total nylon consumption is expected to be more than 5 million tons, and the global nylon consumption is about 5 million tons. 10 million tons. And this is only the data of last year. In the past few decades, the total consumption of nylon in China and the world has reached tens of millions or even hundreds of millions of tons.
Nylon was developed in the 1930s. It was first used in the synthetic fiber industry, and then it was used as an engineering plastic due to its excellent physical and mechanical properties. It has developed rapidly and is currently widely used in the automotive industry, electrical industry, construction Materials, mechanical parts, medical equipment, and daily necessities.
Application of nylon in automobiles Source: DOMO Chemicals
Although nylon materials have good durability, most of the products made are durable goods. But over time, coupled with the huge volume, there will still be a large number of nylon products and materials that will become waste products, which will also cause harm to the environment.
With the implementation of environmental protection concepts such as carbon cycle, recycled nylon materials have been paid more and more attention by the upstream and downstream of the industry chain.
According to INVISTA, a certain recycled nylon 66 can achieve the same performance as new materials. In the production process, the production of new recycled nylon 66 reduces greenhouse gas emissions by 83% and energy consumption by 82% compared with virgin nylon 66. %, the water consumption is reduced by 57%. It can be seen that recycled nylon has huge practical and environmental value.
Nylon will degrade during processing, resulting in the loss of molecular weight, affecting the melt strength and processability of the polymer, and will also cause a certain degree of degradation due to environmental factors during use. Or recycled materials often cannot be used in applications with high performance requirements.
The nylon molecular chain is mainly composed of polyamide groups. After its degradation and chain scission, a large number of short-chain molecules containing terminal amino or terminal carboxyl active groups will be formed, which will cause the melt index of the material to increase and the heat resistance, strength, hydrolysis resistance and other properties to decline. If they are end-capped and chain-extended, their performance can be effectively improved.
Schematic diagram of nylon 66 structure
The chain extender increases the molecular weight of the polymer by coupling or branching the macromolecules through multifunctional compounds with good thermal stability. The chain extension reaction is usually completed by reactive extrusion technology, which has the advantages of simplicity, speed and safety, improves product performance, improves material quality, and thus improves the competitiveness of modified plastic products.
Nylon was developed in the 1930s. It was first used in the synthetic fiber industry, and then it was used as an engineering plastic due to its excellent physical and mechanical properties. It has developed rapidly and is currently widely used in the automotive industry, electrical industry, construction Materials, mechanical parts, medical equipment, and daily necessities.
Application of nylon in automobiles Source: DOMO Chemicals
Although nylon materials have good durability, most of the products made are durable goods. But over time, coupled with the huge volume, there will still be a large number of nylon products and materials that will become waste products, which will also cause harm to the environment.
With the implementation of environmental protection concepts such as carbon cycle, recycled nylon materials have been paid more and more attention by the upstream and downstream of the industry chain.
According to INVISTA, a certain recycled nylon 66 can achieve the same performance as new materials. In the production process, the production of new recycled nylon 66 reduces greenhouse gas emissions by 83% and energy consumption by 82% compared with virgin nylon 66. %, the water consumption is reduced by 57%. It can be seen that recycled nylon has huge practical and environmental value.
Nylon will degrade during processing, resulting in the loss of molecular weight, affecting the melt strength and processability of the polymer, and will also cause a certain degree of degradation due to environmental factors during use. Or recycled materials often cannot be used in applications with high performance requirements.
The nylon molecular chain is mainly composed of polyamide groups. After its degradation and chain scission, a large number of short-chain molecules containing terminal amino or terminal carboxyl active groups will be formed, which will cause the melt index of the material to increase and the heat resistance, strength, hydrolysis resistance and other properties to decline. If they are end-capped and chain-extended, their performance can be effectively improved.
Schematic diagram of nylon 66 structure
The chain extender increases the molecular weight of the polymer by coupling or branching the macromolecules through multifunctional compounds with good thermal stability. The chain extension reaction is usually completed by reactive extrusion technology, which has the advantages of simplicity, speed and safety, improves product performance, improves material quality, and thus improves the competitiveness of modified plastic products.
2024年05月29日 11:58:28
2024年05月29日 11:58:28
2024年05月29日 11:58:28
2024年05月29日 11:58:28
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