Composite polyester hot-melt adhesive and preparation method thereof and preparation method of anti-scouring geotextile

Patent metadata

Field	Value
Publication number	US-12152173-B2
Application number	US-202017258163-A
Country	US
Kind code	B2
Filing date	Jul 4, 2020
Priority date	Jul 8, 2019
Publication date	Nov 26, 2024
Grant date	Nov 26, 2024

Abstract

A composite polyester hot-melt adhesive, a preparation method thereof and a preparation method of an anti-scouring geotextile are provided. The preparation method of the composite polyester hot-melt adhesive includes the following steps: performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst, adding a stabilizer for a polycondensation reaction to obtain a polyester hot-melt adhesive, then adding polymethyl methacrylate (PMMA) microspheres for mixing and stirring to obtain the composite polyester hot-melt adhesive. The anti-scouring geotextile is obtained by bonding a polyethylene terephthalate woven fabric with a polypropylene geotextile by the composite polyester hot-melt adhesive. The composite polyester hot-melt adhesive has the advantages of high bonding strength and good anti-impact performance, and the prepared anti-scouring geotextile has the advantages of high anti-scouring strength, good soil conservation performance, strong protection capability and long service life.

First claim

What is claimed is:

1. A preparation method of a composite polyester hot-melt adhesive, comprising the following steps:
(1) performing an esterification reaction on a dibasic acid and a dihydric alcohol under a protection of nitrogen and an action of a titanium/cobalt composite catalyst; wherein the titanium/cobalt composite catalyst is a cobalt catalyst and a titanium catalyst, the cobalt catalyst is cobalt acetate, and the titanium catalyst is one selected from the group consisting of tetrabutyl titanate, tetraisopropyl titanate and tetramethyl titanate;
an addition amount of the titanium/cobalt composite catalyst is 0.01%-0.03% of a total mass of the dibasic acid, the titanium catalyst accounts for 65-75 wt % of the titanium/cobalt composite catalyst, and the cobalt catalyst accounts for 25-35 wt % of the titanium/cobalt composite catalyst;
the temperature of the esterification reaction is 180° C.-200° C.; terminating the esterification reaction when distillate water of the esterification reaction is 95%-98% of a theoretical water yield of the esterification reaction to obtain an esterification product; and
wherein, the mass ratio of the dibasic acid and the dihydric alcohol is 1:(1.2-1.5);
the dibasic acid is a mixture of terephthalic acid, isophthalic acid and 2-phenyl glutaric acid with a molar ratio of 1:(0.10-0.30):(0.10-0.30);
the dihydric alcohol is a mixture of diethylene hexanediol, diethylene glycol and 1,4-butanediol with a molar ratio of (1.0-1.2):(0.5-0.7):(0.2-0.4);
(2) after holding for 30 min-50 min, adding a stabilizer to the esterification product to obtain a first mixture, and continuously raising the temperature of the first mixture to 230° C.-240° C.; reducing the pressure to 80 Pa-100 Pa to conduct a polycondensation reaction on the first mixture for 1.5 h-3 h to obtain a polyester hot-melt adhesive;
(3) adding polymethyl methacrylate (PMMA) microspheres and gluconolactone into the polyester hot-melt adhesive under normal pressure and the protection of nitrogen to obtain a second mixture, and mixing and stirring the second mixture for 1 h-1.5 h at 230° C.-240° C. to obtain the composite polyester hot-melt adhesive, wherein an amount of the gluconolactone is 0.1 wt %-0.3 wt % of the polyester hot-melt adhesive.

2. The preparation method of the composite polyester hot-melt adhesive according to claim 1 , wherein, the stabilizer in step (2) is triphenyl phosphite or trimethyl phosphate.

3. The preparation method of the composite polyester hot-melt adhesive according to claim 1 , wherein, an addition amount of the PMMA microspheres in step (3) is 0.5 wt %-1 wt % of the polyester hot-melt adhesive.

4. The preparation method of the composite polyester hot-melt adhesive according to claim 1 , wherein, the particle size of each PMMA microsphere of the PMMA microspheres is 5 μm-10 μm.

5. A composite polyester hot-melt adhesive prepared by the preparation method of the composite polyester hot-melt adhesive according to claim 1 .

6. A preparation method of an anti-scouring geotextile using the composite polyester hot-melt adhesive according to claim 5 , comprising the following steps:
melting and mixing the composite polyester hot-melt adhesive with water to obtain a third mixture, spraying the third mixture onto a polyethylene terephthalate woven fabric, standing for 1 min-3 min to obtain a processed polyethylene terephthalate woven fabric, and pressing the processed polyethylene terephthalate woven fabric with a polypropylene geotextile under a pressure of 50 Kgf-300 Kgf for 1 min-5 min.

7. The preparation method of the anti-scouring geotextile according to claim 6 , wherein, the mass ratio of the composite polyester hot-melt adhesive and the water is 3-4:1.

8. The preparation method according to claim 2 , wherein, the particle size of each PMMA microsphere of the PMMA microspheres is 5 μm-10 μm.

9. The preparation method according to claim 3 , wherein, the particle size of each PMMA microsphere of the PMMA microspheres is 5 μm-10 μm.

10. The composite polyester hot-melt adhesive according to claim 5 , wherein, the stabilizer in step (2) is triphenyl phosphite or trimethyl phosphate.

11. The composite polyester hot-melt adhesive according to claim 5 , wherein, an addition amount of the PMMA microspheres in step (3) is 0.5 wt %-1 wt % of the polyester hot-melt adhesive.

Assignees

• China Inst Water Resources & Hydropower Res

Inventors

• Yu Shu
• Chen Zuyu
• Zhang Laizhang
• Yang Wenxin
• Wen Yanfeng
• Li Zhanbin
• Cao Wei
• Zhang Maosheng
• Yue Fan
• Li Yanlong
• Li Peng
• Si Zheng
• Gao Wugang
• Liu Pengyi
• Dang Weiqin
• Han Zongjun
• Zhou Jiawei
• Xue Qiang
• Zhang Qiang
• Wang Aiping
• Guo Yumei
• Liang Xiaowei
• Liu Xueying

Classifications

• C09J11/08

  Macromolecular additives · CPC title

• C09J11/06

  organic · CPC title

• C09J2301/304

  the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C · CPC title

• C09J2301/412

  presence of microspheres · CPC title

• C09J2301/408

  additives as essential feature of the adhesive layer · CPC title