Journal of Textile Research ›› 2025, Vol. 46 ›› Issue (06): 8-16.doi: 10.13475/j.fzxb.20240702201

• Column of Youth Scientists′Salon on New Fiber Materials and Green Textile Development • Previous Articles     Next Articles

Preparation of fluorinated waterborne polyurethane from waste polyester fibers by alcoholysis

SHI Sheng1,2, WANG Yazhou1, WANG Shuhua1,2(), PANG Mingke1, LI Xin1, ZHANG Meiling1, GAO Chengyong1,2   

  1. 1. College of Light Textile Engineering, Taiyuan University of Technology, Jinzhong, Shanxi 030600, China
    2. Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering, Taiyuan, Shanxi 030024, China
  • Received:2024-07-09 Revised:2024-09-10 Online:2025-06-15 Published:2025-07-02
  • Contact: WANG Shuhua E-mail:1308870214@qq.com

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Abstract:

Objective Polyester fibers is popularly used in modern textile industry, and the recycling of waste polyester fibers is very meaningful. The objective of this paper is to recycle waste polyester by chemical methods and synthesize the obtained products into fluorinated waterborne polyurethane (FWPU) with higher value, in order to realize the recycling and reuse of waste polyester fibers.

Mothed The alcoholysis of waste polyester fibers was carried out under the conditions of choline chloride and zinc acetate as composite catalysts using ethylene glycol as alcoholysis agent. The effects of the molar ratio of choline chloride and zinc acetate, the reaction temperature, and the mass ratio of polyester fibers to ethylene glycol on the conversion rate of polyester fibers and the production rate of bis(2-hydroxyethyl)terephthalate(BHET) were explored, respectively. The products from the alcoholysis were studied. The alcoholysis products were synthesized into FWPU, and the effects of different isocyanate index(R-values), 2,2-bis(hydroxymethyl)propionic acid(DMPA) additions, and 2,2,3,3,4,4,5,5-octafluoro-1-pentanol(F8) additions on the properties of FWPU emulsion appearance, emulsion stability, pH value, and emulsion viscosity were investigated, and the molecular structure of FWPU was characterized.

Results The best conditions for alcoholysis reaction were found as follows: reaction temperature 180 ℃, zinc acetate to choline chloride was 1∶1, reaction time 4 h, polyester to ethylene glycol was 1∶5, under which the polyester fiber conversion rate was as high as 100%, the product yield of BHET reached up to 91.5%. When the R vlaue was 1.3, the content of DMPA was 8%, the content of F8 was 15%, the appearance of FWPU emulsion was clear and transparent, particle size was less than 255 nm, which belongs to the range of polyurethane emulsion. Viscosity was 95 mPa·s, pH value was weak alkaline, emulsion has good stability.

Conclusion In this study, waste polyester fibers were recycled and FWPU were synthesized by alcoholysis, and it was found that waste polyester fibers can be recycled by glycol alcoholysis, and FWPU can be successfully synthesized from the alcoholysis products, and the obtained FWPU has small particle size and viscosity, good stability, and appearance.

Key words: waste textile, waste polyester, alcoholysis, fluorinated waterborne polyurethane, emulsion stability

CLC Number: 

  • TS102.9

Fig.1

Polyester fiber alcoholysis diagram"

Fig.2

Influence of different factors on yield of alcoholysis.(a) Choline chloride to zinc acetate molar ratio; (b) Reaction time; (c) Polyester fiber to ethylene glycol mass ratio"

Fig.3

Analysis result of alcoholysis products.(a) FT-IR spectra; (b) XRD pattern; (c) TG curves"

Tab.1

Properties of fluorinated waterborne polyurethanes with different R values"

R值 乳液状态 稳定性 pH值 黏度/(mPa·s)
1.1 半透明 无沉淀 7.2 125
1.2 白色 无沉淀 7.7 110
1.3 透明 无沉淀 7.7 80
1.4 白色 无沉淀 7.4 59
1.5 白色 少量沉淀 7.0 45

Fig.4

Influence of R values on particle size of fluorinated waterborne polyurethane"

Tab.2

Properties of fluorinated waterborne polyurethanes with different DMPA additions"

DMPA添
加量/%		 乳液状态 稳定性 pH值 黏度/
(mPa·s)
6 白色 沉淀 7.6 70
7 石灰水色 无沉淀 7.5 96
8 白色 无沉淀 7.7 110
9 石灰水色 无沉淀 7.4 118
10 蓝光透明 无沉淀 7.3 126

Fig.5

Influence of DMPA additions on particle size of fluorinated waterborne polyurethane"

Tab.3

Properties of fluorinated waterborne polyurethanes with different F8 additions"

F8添加量/% 乳液状态 稳定性 pH值 黏度/(mPa·s)
0 半透明 无沉淀 7.2 125
5 淡蓝光半透明 无沉淀 7.2 116
10 白色 无沉淀 7.7 110
15 透明 无沉淀 7.4 95
20 白色 少量 7.0 80

Fig.6

Physical diagram of fluorinated waterborne polyurethanes before and after stability test (a) and water absorption curve(b)"

Fig.7

Influence of F8 additions on particle size of fluorinated waterborne polyurethane"

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