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Method for preparing microcapsule polyurethane premix

A polyurethane prepolymer and microcapsule technology, applied in the field of polyurethane, can solve the problems of high cost, affecting the accuracy of product proportioning, complicated construction process, etc., so as to reduce waste, save the time required for proportioning and mixing, and simplify construction. The effect of the device

Inactive Publication Date: 2017-09-08
CHENGDU XINZHU ROAD & BRIDGE MASCH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, in order to avoid the premature reaction of each component, the curing agent, polyurethane prepolymer and other components are packaged and stored at the factory, weighed according to the proportion at the construction site, mixed first and then poured, which not only makes the construction process cumbersome , also involves the ratio measurement problem, which affects the accuracy of product ratio, and also needs to be equipped with special blending equipment, the cost is high

Method used

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Examples

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Effect test

preparation example Construction

[0023] The object of the present invention is to provide a kind of preparation method of microcapsule polyurethane premix, specifically comprises the following steps:

[0024] 1) Using microcapsule technology to make curing agent or other components into solid microcapsules respectively.

[0025] Specifically, the curing agent or other components are encapsulated in the microcapsules through microcapsule forming technology, and respectively made into solid microcapsules containing the curing agent or other components. It should be stated that the components encapsulated in the solid microcapsules of the present invention are not limited to one, as long as it is ensured that they do not react with each other. That is to say, the present invention can adopt multiple different solid microcapsules to encapsulate different single components, and can also encapsulate multiple components that do not react with each other in one microcapsule. The number of solid microcapsules, the nu...

Embodiment 1

[0040] The preparation method of the present embodiment microcapsule polyurethane premix is ​​as follows:

[0041]1) Use a sprayer to spray the liquid MOCA and polyether polyol mixture and polyethylene melted at 80°C 1:1 from the concentric circular tube to form a concentric double liquid column, in the air at a temperature of 10°C Cool and solidify to make microcapsules with a particle size of 500 μm.

[0042] 2) Evenly mix the solid microcapsules in the polyurethane prepolymer to form a premix, the blending ratio is 1:1, vacuumize and degas after mixing, wherein the vacuum degree is not lower than -0.5MPa, until the premix No air bubbles; at the same time, it should be ensured that the solid microcapsules are suspended in the polyurethane prepolymer without precipitation or delamination.

[0043] 3) When in use, the microcapsule shell is broken by introducing compressed air into the bucket containing the microcapsules and polyurethane prepolymer to pressurize, the pressure ...

Embodiment 2

[0045] The preparation method of the present embodiment microcapsule polyurethane premix is ​​as follows:

[0046] 1) Use a sprayer to spray 100g of liquid 1,4-butanediol and polyether polyol mixture and 80g of molten polyethylene from concentric circular tubes to form concentric double liquid columns. Medium cooling and solidification to make microcapsules with a particle size of 200 μm.

[0047] 2) Evenly mix the solid microcapsules in the polyurethane prepolymer to form a premix, the mixing weight ratio is 1:1, vacuumize and degas after mixing, wherein the vacuum degree is not lower than -0.7MPa, until the premix No air bubbles; at the same time, it should be ensured that the solid microcapsules are suspended in the polyurethane prepolymer without precipitation or delamination.

[0048] 3) When in use, the microcapsule shell is broken by heating the barrel containing the microcapsules and polyurethane prepolymer, the temperature is between 80 and 120°C, and the curing agen...

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Abstract

The invention provides a method for preparing microcapsule polyurethane premix, and belongs to the technical field of polyurethane. The method for preparing microcapsule polyurethane premix comprises the steps that 1, curing agents or other components are respectively prepared into solid microcapsules by utilizing the microencapsulation technology; 2, solid microcapsules are uniformly mixed in polyurethane prepolymer and vacuum degassed after the mixing; 3, when the microcapsules are in use, the shells of the microcapsules are ruptured, curing agents or other components wrapped by the capsules spill, contact is made with polyurethane prepolymer and a polymerization reaction occurs, and polyurethane elastomers are generated. By the microencapsulation technology, curing agents or other components in capsule form are respectively distributed in polyurethane prepolymer, by the obstruction of the capsule shells, the components do not react with each other before use, and long-term stable storage is achieved. When the microcapsules are in use, the capsule shells are ruptured by means of temperature, pressure, ultraviolet or the like, the components are in contact with each other, the rapid polymerization reaction occurs, and polyurethane elastomers are generated, proportioning and mixing are not required at the construction site, the construction time is saved, and the construction facilities are simplified in the meantime.

Description

technical field [0001] The invention belongs to the technical field of polyurethane, in particular to a method for preparing a microcapsule polyurethane premix. Background technique [0002] Compared with the one-component polyurethane elastomer that is convenient to use but not convenient for long-term storage, the castable polyurethane elastomer produced by the curing reaction of curing agent, polyurethane prepolymer or other components has better temperature resistance. It has the advantages of high strength, wide and adjustable hardness range, and high storage stability. It is widely used, and can be used for bridge waterproofing, track bed laying, etc. [0003] At present, in order to avoid the premature reaction of each component, the curing agent, polyurethane prepolymer and other components are packaged and stored at the factory, weighed according to the proportion at the construction site, mixed first and then poured, which not only makes the construction process cu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/10C08G18/66C08G18/48C08G18/32B01J13/04
CPCB01J13/046C08G18/10C08G18/6674C08G18/6685C08G18/48C08G18/3814C08G18/3206
Inventor 游珏涛黄杰谭丽容沈永泽张松俞海敏王润滋
Owner CHENGDU XINZHU ROAD & BRIDGE MASCH CO LTD
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