Stabilizer, preparation method thereof, preparation method and application of polymer polyhydric alcohol

A technology of oligomer polyol and polyether polyol, which is applied in the field of stabilizer preparation and can solve problems such as gelation and agglomeration, difficult reaction stages, etc.

Active Publication Date: 2019-05-24
WANHUA CHEM GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these conjugation methods are difficult to contro...

Method used

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  • Stabilizer, preparation method thereof, preparation method and application of polymer polyhydric alcohol
  • Stabilizer, preparation method thereof, preparation method and application of polymer polyhydric alcohol
  • Stabilizer, preparation method thereof, preparation method and application of polymer polyhydric alcohol

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Effect test

Embodiment 1

[0071] Prepolymer synthesis: add 43.5g TDI-Trimer (TDI trimer 50% (w / w) butyl acetate solution) and 0.15g dibutyltin dilaurate (DBTDL) catalyst in the there-necked flask, start stirring, adjust The temperature in the reaction system was 45°C; when the temperature reached 45°C, 10.8g of HEMA (hydroxyethyl methacrylate) was slowly added dropwise, and the reaction was stopped after 4 hours to obtain a prepolymer.

[0072] Stabilizer synthesis: drop 500g of polyether polyol A into the above prepolymer, react for 2 hours, raise the temperature to 80°C, detect the reaction progress by infrared absorption spectrum, and reach 2261cm -1(s, N=C=O) until the absorption peak disappears, react for another 1h; add phosphoric acid to inactivate, remove the volatile solvent butyl acetate, and obtain the stabilizer ①; its viscosity is 3318cp@25°C, and the degree of unsaturation is 0.065 meq / g.

Embodiment 2

[0074] Prepolymer synthesis: Add 36.4g of HDI biuret and 60ml of toluene (dehydrated with 4A molecular sieve in advance) into a three-necked flask, then add 0.15g of dibutyltin dilaurate (DBTDL) catalyst, start stirring, and slowly heat up to 60°C ; When the temperature reaches 60°C, slowly add 20.6g HEMA (hydroxyethyl methacrylate) dropwise, control the reaction temperature in the system to ±2°C, stop the reaction after 4h, and obtain a prepolymer.

[0075] Stabilizer synthesis: drop 500g of polyether polyol B into the above prepolymer, react for 2 hours, raise the temperature to 100°C, detect the reaction progress by infrared absorption spectrum, and reach 2261cm -1 (s, N=C=O) until the absorption peak disappears, react for another 1h; add phosphoric acid to inactivate, remove the volatile solvent butyl acetate, and obtain the stabilizer ②; its viscosity is 2950cp@25°C, and the degree of unsaturation is 0.089 meq / g.

Embodiment 3

[0080] Preparation of polymer polyol 1: a 500ml four-necked bottle is equipped with a stirrer, a heating device, a temperature control device and a feeder as a reactor; add basic polyether polyol C (Wanhua 3156) 55.4g, 3.9g stabilizer ①, after nitrogen replacement, stir slowly and heat up to 110°C, then continuously add top material (10.47g isopropanol, 85.71g basic polyether polyol C 3156, a mixture of 46.55g acrylonitrile, 69.83g styrene, and 1.21g azobisisobutyronitrile), and the temperature is controlled at 115°C to 120°C. The dropwise addition was completed within 100 minutes, the feeding was completed, the aging reaction was carried out for 1 hour, and the vacuum monomer removal was continued for 2 hours to obtain the product and measure the product index. The hydroxyl value of the obtained polymer polyol 1 is 29.4 mgKOH / g, the solid content is 44.8%, and the viscosity is 4959 mPa·S; after adding 3% (w / w) water to the polymer polyol 1, its viscosity becomes 5183 mPa ·...

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Abstract

The invention belongs to the technical field of stabilizer preparation, and particularly relates to a stabilizer and a preparation method thereof, and a preparation method and application of polymer polyhydric alcohol. The preparation method of the stabilizer comprises the following steps of: contacting and reacting hydroxyl acrylate or hydroxyalkyl methacrylate with multifunctional isocyanate toprepare a prepolymer, reacting the prepolymer with oligomer polyhydric alcohol. The polymer polyhydric alcohol is prepared by contacting base polyether polyhydric alcohol with an ethylenically unsaturated monomer for polymerization in the presence of an initiator and a stabilizer. According to the invention, the obtained polymer polyhydric alcohol has good dispersion stability and low viscosity characteristics, and a mixture containing the polymer polyhydric alcohol in a high-moisture polyurethane foaming system still has good fluidity.

Description

technical field [0001] The invention belongs to the technical field of stabilizer preparation, and in particular relates to a stabilizer and its preparation method, a polymer polyol preparation method and its application. Background technique [0002] Polymer polyol is a bulk industrial product, which is formed by in-situ polymerization of one or several vinyl monomers with basic polyether polyol as the continuous phase. Polymer polyols are mainly used in the preparation of polyurethane foams, and polymer polyols are required to have high solid content and low viscosity during the preparation process. [0003] The first commercial polymer polyols were made from acrylonitrile alone or a styrene / acrylonitrile blend as the reactive monomer. However, its applications are limited due to its high viscosity, slightly yellowish color, and cause scorching on the resulting polyurethane foam. With the improvement of the preparation process, the yellowing and scorching phenomena are s...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/48C08F283/06C08F212/08C08F220/44C08G18/63C08G18/66C08G18/65C08G18/32C08G101/00
Inventor 李付国吴训锟李晶鞠昌迅王伦朋刘洋孙亚明郑京涛吕树卫
Owner WANHUA CHEM GRP CO LTD
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