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Application of a Low Phosphorus-Containing Crosslinking Agent in the Preparation of Polyurethane Films

A polyurethane film and cross-linking agent technology, which is applied in the application field of low phosphorus-containing cross-linking agent in the preparation of polyurethane film, can solve the problems of poor flame retardancy, long curing time, and unfavorable environmental protection of polyurethane, and achieve the goal of enhancing flame retardancy Effect

Active Publication Date: 2022-03-25
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the toxicity of dibutyltin dilaurate above, using it as an organotin catalyst is not conducive to environmental protection
After research by the inventors of the present disclosure, it was found that during the process of preparing a transparent polyurethane film, the condition of placing it at room temperature for 7 days is too long to cure, which is not conducive to application in production, and the polyurethane has poor flame retardancy

Method used

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  • Application of a Low Phosphorus-Containing Crosslinking Agent in the Preparation of Polyurethane Films
  • Application of a Low Phosphorus-Containing Crosslinking Agent in the Preparation of Polyurethane Films
  • Application of a Low Phosphorus-Containing Crosslinking Agent in the Preparation of Polyurethane Films

Examples

Experimental program
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Effect test

Embodiment 1

[0062] The synthesis of the cyclic phosphazene end-capped by cross-linking agent amino group, concrete steps are as follows:

[0063] (1) Synthesis of six (acetylaminophenyl) cyclotriphosphazenes

[0064] Take 1mmol of N 3 P 3 Cl 6 , 7.2mmol 4-acetylaminophenol, K of 10.8mmol 2 CO 3 , placed in 60mL of acetone solution and heated to reflux for 70-100h; then evaporate the volatile substances in the product under vacuum conditions, and wash the residue 3 times with 20mL of water each time; then wash 2 times with ethanol, each time with ethanol 5 mL; finally washed 3 times with hexane, each time with 5 mL of hexane, and vacuum-dried the obtained white solid I at 40°C to 60°C for 48 to 72 hours to obtain hexa(acetylaminophenyl)cyclotriphosphazene, such as Figure 11 , 13 shown.

[0065] (2) Synthesis of amino-terminated cyclophosphazenes

[0066] Add 0.5 mmol of hexa(acetylaminophenyl)cyclotriphosphazene and NaOH with a mass concentration of 44-45% into 20 mL of methanol s...

Embodiment 2

[0069] Synthesis of Pure Polyurethane Films

[0070] 2 mmol of hexamethylene diisocyanate and 1 mmol of polypropylene glycol 400 were mixed and heated at 65° C. for 60 minutes in a nitrogen atmosphere to obtain a prepolymer;

[0071] Then 5wt.% tris(2-aminoethyl)amine was dissolved in 15mL of N,N-dimethylformamide, the resulting solution was added to the prepolymer, and magnetically stirred evenly; then the solution was cast into On the PTFE mold, the solvent is evaporated, and the evaporated liquid layer is cross-linked at 60° C. for 48 hours. After cross-linking, the final product, a horizontally crossed polyurethane film, is denoted as PU.

Embodiment 3

[0073] Synthesis of Polyurethane Films

[0074] Mix 2mmol hexamethylene diisocyanate and 1mmol polypropylene glycol 400 and heat at 65°C for 60 minutes in a nitrogen atmosphere to obtain a prepolymer; then dissolve 5wt.% amino-terminated cyclophosphazene in N,N - In dimethylformamide, add the obtained solution to the prepolymer, stir evenly, cast the solution on a PTFE mold, evaporate the solvent, and cross-link the evaporated liquid layer at 60°C for 48h, and then obtain the final product Flat cross polyurethane film, denoted as PU-1.

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Abstract

The disclosure provides an application of a low-phosphorus-containing crosslinking agent in the preparation of a polyurethane film. The structural formula of the low-phosphorus-containing crosslinking agent is: the method of the polyurethane film is: polyisocyanate and polyol are prepolymerized to obtain a prepolymer, and the The low phosphorus-containing crosslinking agent and the prepolymer undergo a crosslinking reaction in the mold to obtain a polyurethane film. The disclosure applies a low-phosphorus-containing crosslinking agent to the synthesis of a polyurethane film, so that the polyurethane film has good fireproof performance and shape memory performance.

Description

technical field [0001] The disclosure belongs to the field of film materials, and relates to the application of a low phosphorus-containing crosslinking agent in preparing polyurethane films. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Polyurethane (PU) has many properties that make it a high-performance polymer material. Polyurethanes have been used to produce a wide range of industrial applications including biomedical, construction, automotive, textiles, thermoplastic and thermoset polyurethanes are found in a wide range of applications. Among various strong elastomers, thermoplastic polyurethane (TPU) is promising due to its finely tuned structure and microphase separation of soft and hard segments. Thermoset polyurethanes are an important class of materials with high thermal stability. chemical stability. The basic chemistry of therm...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/32C08G18/10C08J5/18C08L75/04
CPCC08G18/3206C08G18/3889C08G18/10C08J5/18C08J2375/04C08J2375/08C08G18/73C08G18/4825C08G18/6681
Inventor 迟虹宋秀环李天铎
Owner QILU UNIV OF TECH
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