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A continuous production system for preparing water-based polyurethane dispersion, continuous production process and application of water-based polyurethane dispersion

A water-based polyurethane, production process technology, used in polyurea/polyurethane coatings, polyurea/polyurethane adhesives, transportation and packaging, etc., can solve the problem of excessive dependence on labor, no mention of continuous production processes in the prepolymerization process, Problems such as large quality fluctuations between product batches

Active Publication Date: 2020-08-28
WANHUA CHEMICAL (NINGBO) CO LTD +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the batch production process has significant disadvantages in the production of water-based polyurethane dispersions, which are as follows: (1) low production efficiency, high device vacancy rate, and high production costs; (2) excessive production dependence on labor and low automation; (3) The quality fluctuates greatly between product batches, and the defective rate is high
[0005] The continuous production process of water-based polyurethane dispersion can effectively overcome the problems caused by batch production. Patent document CN102633971A discloses a continuous production process of water-based polyurethane dispersion based on twin-screw reactor design. Polymerization, high-temperature dispersion process at 90-150°C; for water-based polyurethane systems, high-temperature pre-polymerization brings unpredictable side reactions, uncontrollable macromolecular structure, and high-temperature dispersion will make it very difficult to control the particle size of the emulsion during dispersion. The process temperature is high, and the final emulsion needs to be cooled to obtain the finished emulsion, and the production cost is high because of the high energy consumption of the process
Patent document WO2017 / 009161A1 discloses a continuous dispersing device based on a static mixer, but there is no mention of the continuous production process of the prepolymerization process
[0006] In addition, the simple tubular reactor has advantages for the liquid phase system with low reaction viscosity, but the water-based polyurethane prepolymer gradually increases from low viscosity to high viscosity as the reaction progresses. If no suitable internal components are installed, The mixing effect and reaction rate of the tubular reactor in continuous production are affected, the molecular weight distribution of the product is very wide, the reaction rate is very slow, and the product performance is greatly reduced

Method used

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  • A continuous production system for preparing water-based polyurethane dispersion, continuous production process and application of water-based polyurethane dispersion
  • A continuous production system for preparing water-based polyurethane dispersion, continuous production process and application of water-based polyurethane dispersion
  • A continuous production system for preparing water-based polyurethane dispersion, continuous production process and application of water-based polyurethane dispersion

Examples

Experimental program
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Effect test

preparation example Construction

[0103] 1) The preparation process of the adhesive: mix 100g of water-based polyurethane dispersion and 0.05g of BYK024 (Byk Chemicals), stir at 500rpm for 5min, add 0.2g of Tego245 (Digo), stir for another 5min, and then add 0.15 gVesmody U604 (Wanhua Chemical), then stirred at 600rpm for 10min.

[0104] 2) Preparation of test samples

[0105] Coating with the prepared adhesive and obtaining a composite material on the substrate as a test sample:

[0106] composite material Substrate 1 Substrate 2 A rubber rubber B canvas canvas C pvc pvc

[0107] Using a brush, first apply the adhesive dispersion thinly to a substrate strip 2.5 cm wide and 15 cm long and dry in an oven at 65° C. for 5 minutes, then remove and press at 30 kg / cm for 10 seconds, Composite material A was prepared.

[0108] Composite material B and composite material C were prepared using the same method.

[0109] 3) Test the peel strength of the composite material

...

Embodiment 1

[0113] Embodiment 1 prepolymer method prepares waterborne polyurethane

[0114] see figure 1 , pump 600 parts of TDI and 50 parts of acetone from the feeding port L1, mix completely in the first mixer M1 and preheat to 60°C, then enter the first tubular reactor VR1, and put 300 parts of PTMEG2000 (polytetrahydrofuran binary Alcohol, Mn=2000) is pumped in from feed port L11, 550 parts of PTMEG2000 are pumped in from feed port L12, 550 parts of PTMEG2000 are pumped in from feed port L13, 600 parts of PTMEG2000 are pumped in from feed port L14, four parts of PTMEG2000 are pumped in simultaneously, The pressure drop of VR1 is 0.04Mpa, the reaction temperature of VR1 is set to 85°C, and the residence time is 30 minutes; after the first step of reaction, the prepolymer I enters the second mixer M2, and at the same time, 120 parts of DMPA, 70 Parts of BDO, 310 parts of acetone, and 1 part of dibutyltin dilaurate catalyst are pumped into M2 from the feed port L2, mixed evenly, and th...

Embodiment 2

[0115] Embodiment 2 acetone method prepares waterborne polyurethane

[0116] Pump 150 parts of HDI (hexamethylene diisocyanate), 140 parts of IPDI (isophorone diisocyanate) and 240 parts of acetone from the feeding port L1, mix completely in the first mixer M1 and preheat to 60°C After entering the first tubular reactor VR1, 400 parts of PBA2000 (polybutylene adipate glycol, Mn=2000) are pumped in from the feeding port L11, 500 parts of PBA2000 are pumped in from the feeding port L12, and 500 parts of PBA2000 Pump in from feeding port L13, pump in 700 parts of PBA2000 from feeding port L14, pump in four parts of PBA2000 at the same time, the pressure drop of VR1 is 0.04Mpa, the reaction temperature of VR1 is set at 85°C, and the residence time is 30 minutes; the first step After the reaction, the obtained prepolymer I enters the second mixer M2. At the same time, 2 parts of dibutyltin dilaurate are pumped into M2 from the feeding port L2, and after mixing evenly, enter the sec...

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Abstract

The invention belongs to the technical field of continuous production of water-based polyurethane dispersions, and provides a continuous production system for preparing water-based polyurethane dispersions, and a continuous production process and application of water-based polyurethane dispersions. The continuous production process includes: (1) combining polyisocyanate with oligomeric The polyol is obtained in the first tubular reactor VR1 to obtain the prepolymer I; the oligomer polyol is added into VR1 in four parts; (2) the prepolymer I is reacted with the nonionic hydrophilic compound in the second tubular reactor Prepolymer II is obtained in VR2; non-ionic hydrophilic compound is added into VR2 in three parts; (3) prepolymer II and solvent are diluted in VR3; (4) after dilution, it is mixed with hydrophilic chain extender, small molecule Diamines are in VR4; (5) emulsified and dispersed in VR5. This process can realize rapid and efficient continuous production of waterborne polyurethane dispersion.

Description

technical field [0001] The invention belongs to the technical field of continuous production of water-based polyurethane dispersions, and in particular relates to a continuous production system for preparing water-based polyurethane dispersions, a continuous production process and application of water-based polyurethane dispersions. Background technique [0002] Water-based polyurethane dispersion uses water instead of organic solvents as the dispersion medium, does not contain volatile organic solvents (VOC), and is an odorless, non-toxic, green and environmentally friendly organic polymer material. During its use, water volatilizes to form a polyurethane film. Therefore, the film-former of the water-based polyurethane dispersion has the same excellent physical and chemical properties as the polyurethane material. [0003] Water-based polyurethane materials can obtain high-performance materials with different hardness and chemical resistance by adjusting formula and chemica...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J19/24B01F7/00B01F5/06B01F13/10C08G18/08C08G18/10C08G18/48C08G18/66C08G18/32C08G18/34C09D175/08C09J175/08C09D175/14
CPCB01J19/242C09D175/08C09D175/14C09J175/08C08G18/0895C08G18/10C08G18/4854C08G18/6685C08G18/6692B01F25/42B01F27/00B01F33/811C08G18/348C08G18/3228
Inventor 赵伟国孙永建
Owner WANHUA CHEMICAL (NINGBO) CO LTD
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