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Long-chain alkyl polyester polyol, waterborne polyurethane emulsion and preparation methods thereof

A technology of long-chain alkyl diols and polyester polyols, applied in the direction of polyurea/polyurethane adhesives, adhesive types, adhesives, etc., can solve the problems of decreased strength, easy to open glue, difficult to glue film, etc.

Inactive Publication Date: 2021-06-22
吉林天泽二氧化碳科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the polyester polyols used in waterborne polyurethanes are derived from polycondensation of diols and dibasic acids with short carbon chains (number of carbon atoms ≤ 6), and have very high crystallization properties, making the film-forming properties of waterborne polyurethanes Poor, it is difficult to form a complete film at room temperature, and the film is very brittle. Therefore, this kind of short-chain polyester water-based polyurethane adhesive is used to bond samples, and the strength will decrease in the later stage, so it is easy to open the glue

Method used

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  • Long-chain alkyl polyester polyol, waterborne polyurethane emulsion and preparation methods thereof
  • Long-chain alkyl polyester polyol, waterborne polyurethane emulsion and preparation methods thereof
  • Long-chain alkyl polyester polyol, waterborne polyurethane emulsion and preparation methods thereof

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preparation example Construction

[0027] In order to solve the problem of poor film-forming and mechanical properties of water-based polyurethane, the application provides a preparation method of long-chain alkyl polyester polyol, which can be introduced into water-based polyurethane to improve the film-forming of water-based polyurethane sex and mechanical properties. Concrete, the application first provides a kind of preparation method of long-chain alkyl polyester polyol, comprising the following steps:

[0028] A) Castor oil, hydroxy-terminated nitrile rubber, long-chain alkyl glycol and long-chain alkyl dibasic acid are mixed, and reacted after heating to obtain a small molecule prepolymer;

[0029] B) mixing the small molecule prepolymer and isopropyl titanate, and reacting at elevated temperature to obtain a long-chain alkyl polyester polyol.

[0030] In the above-mentioned process of preparing long-chain alkyl polyester polyols, the applicant first mixes the raw materials castor oil, hydroxyl-terminat...

Embodiment 1

[0051] Embodiment 1 long-chain alkyl polyester polyol is synthesized

[0052] 1) 950g of castor oil, 4.5g of hydroxy-terminated nitrile rubber (Mn=2300Da), 85g of 1,10-decanediol, and 70g of 1,11-undecane dibasic acid are added to the reactor, Under nitrogen protection, raise the temperature to 130°C, react for 2 hours, then raise the temperature to 180°C, and continue the reaction for 3h;

[0053] 2) The temperature of the reaction kettle was raised to 240°C, 0.65g of isopropyl titanate was added, and the reaction was continued for 3h; the acid value of the reactant was 3mgKOH / g, cooled to 80°C, and discharged to obtain a long-chain alkyl polyester polyol, GPC analysis, Mn=5200Da, Mw=7400Da.

Embodiment 2

[0054] Embodiment 2 long-chain alkyl polyester polyols are synthesized

[0055] 1) The castor oil of 1400g, the hydroxy-terminated nitrile rubber (Mn=4200Da) of 8g, the 1,12-dodecanediol of 95g, the 1,12-dodecanedioic acid of 82g are added to the reactor , under nitrogen protection, raise the temperature to 150°C, react for 0.5 hours, then raise the temperature to 210°C, and continue the reaction for 1h;

[0056] 2) The reaction kettle was heated to 260°C, 1.5g of isopropyl titanate was added, and the reaction was continued for 2h; the acid value of the reactant was 5mgKOH / g, cooled to 80°C, and discharged to obtain a long-chain alkyl polyester polyol, GPC analysis, Mn = 8150 Da, Mw = 13507 Da.

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Abstract

The invention provides a preparation method of long-chain alkyl polyester polyol, which comprises the following steps: A) mixing castor oil, hydroxyl-terminated nitrile rubber, long-chain alkyl dihydric alcohol and long-chain alkyl dibasic acid, and conducting heating and reacting to obtain a small-molecule prepolymer; and B) mixing the micromolecular prepolymer with titanium isopropoxide, and carrying out heating reaction to obtain the long-chain alkyl polyester polyol. The invention further provides waterborne polyurethane. The waterborne polyurethane is prepared from short-chain alkyl polyester polyol, long-chain alkyl polyester polyol, diisocyanate, a hydrophilic chain extender, a small-molecule chain extender, an organic solvent, a catalyst, a neutralizer and water. According to the long-chain alkyl polyester polyol, due to the introduction of nitrile rubber groups, the film forming effect of waterborne polyurethane is greatly improved, a complete self-supporting film can be formed, the obtained waterborne polyurethane is very good in toughness, the tensile strength can be 13.5-25.6 Mpa, and the elongation at break is 475-850%.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to long-chain alkyl polyester polyols, water-based polyurethane emulsions and preparation methods thereof. Background technique [0002] As a green and environment-friendly product, water-based polyurethane has been widely used in coatings, adhesives and other fields, and its film-forming properties are very important for paint films and adhesive films. [0003] Polyester-type water-based polyurethane refers to an important type of polyurethane synthesized by using polyester polyol as a soft segment. Compared with polyether, polyester polyol has higher cohesive energy, and the obtained polyurethane has greater The strength has been widely used in the field of adhesives. However, most of the polyester polyols used in waterborne polyurethanes are derived from polycondensation of diols and dibasic acids with short carbon chains (number of carbon atoms ≤ 6), and have very high crysta...

Claims

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Application Information

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IPC IPC(8): C08G63/48C08G18/68C09J175/14
CPCC08G18/68C08G63/48C09J175/14
Inventor 李儒林
Owner 吉林天泽二氧化碳科技有限公司
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