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High-solid-content polyurethane emulsion and preparation method thereof

A polyurethane emulsion, high solid content technology, applied in the field of water-based polyurethane, can solve the problem of low solid content of polyurethane emulsion

Inactive Publication Date: 2020-03-31
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a high-solid polyurethane emulsion and a preparation method thereof, which solves or partly solves the problem that the chain extenders in the prior art only contain a single ionic group, and the obtained polyurethane emulsion has a relatively low dosage of the chain extender The technical problem of low solids content

Method used

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  • High-solid-content polyurethane emulsion and preparation method thereof
  • High-solid-content polyurethane emulsion and preparation method thereof
  • High-solid-content polyurethane emulsion and preparation method thereof

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preparation example Construction

[0039] see figure 1 , based on the same inventive concept, the application also provides a method for preparing a high-solid polyurethane emulsion, comprising the following steps:

[0040] Step 1, add polyether diol in the reactor.

[0041] Step 2: add isocyanate to polyether diol after dehydration, and react at 50-80° C. for 4-10 hours to form a first mixed solution.

[0042] Step 3, adding a chain extender containing polysulfonic acid ion groups to the first mixed solution, and reacting at 50-80° C. for 4-6 hours to obtain a second mixed solution.

[0043] In step 4, the second mixed solution is lowered to room temperature, and emulsified in water under high-speed shear to obtain a high-solid polyurethane emulsion.

[0044] The preparation method of the present application is simple, easy to enlarge the operation process and realize industrial production. Since the chain extender of the polysulfonic acid ionic group used contains multiple ionic groups, the long-term stabi...

Embodiment 1

[0047] Add 10g of polyethylene glycol (molecular weight: 1000) into the reaction kettle, add 2.09g of toluene diisocyanate after dehydration, and react at 50°C for 4h.

[0048] Add 0.83 g of chain extender (M=Na, x=1) of No. I polysulfonic acid ion group, react at 50°C for 6 hours, cool down to room temperature, and emulsify in water under high-speed shearing to obtain polyurethane emulsion, the highest solid content can be up to 75%.

Embodiment 2

[0050] Add 10 g of polyethylene glycol (molecular weight: 10,000) into the reaction kettle, add 0.26 g of toluene diisocyanate after dehydration, and react at 80°C for 8 hours.

[0051] Add 0.24 g of chain extender (M=Na, x=5) of No. I polysulfonic acid ionic group, react at 80°C for 4 hours, cool down to room temperature, and emulsify in water under high-speed shearing to obtain polyurethane emulsion, the highest solid content can be up to 65%.

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Abstract

The invention discloses a high-solid-content polyurethane emulsion and a preparation method thereof, belonging to the technical field of waterborne polyurethane. The high-solid-content polyurethane emulsion comprises the following components: polyether glycol, isocyanate and a chain extender containing polysulfonic acid ion groups. According to the high-solid-content polyurethane emulsion and thepreparation method thereof, the surface charge density of micelles in the polyurethane emulsion can be effectively improved under the condition of relatively low use amount of the chain extender, thesolid content of the emulsion is improved, and the long-term stability of the polyurethane emulsion is realized.

Description

technical field [0001] The invention relates to the technical field of water-based polyurethane, in particular to a high-solid polyurethane emulsion and a preparation method thereof. Background technique [0002] The unique structural characteristics and excellent performance of polyurethane materials are gradually replacing traditional solvent-based polyurethane materials. In recent years, they have developed rapidly and are gradually receiving the attention of government departments. At present, industrial fields such as coatings, adhesives, and synthetic leather are vigorously advocating the use of environmentally friendly water-based materials. [0003] The hydrophilic group is the key to the emulsification of water-based polyurethane in water, and its type and content have a significant impact on the appearance, particle size, solid content, viscosity, and stability of water-based polyurethane. Usually, a chain extension method is used to introduce a hydrophilic group ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/67C08G18/48C08G18/32
CPCC08G18/3855C08G18/4825C08G18/4833C08G18/4854C08G18/6666C08G18/6685C08G18/677
Inventor 万晓波穆有炳
Owner JIANGHAN UNIVERSITY
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