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Urea formaldehyde resin-coated isocyanate microcapsule and preparation method thereof

A technology of isocyanate and urea-formaldehyde resin, applied in the field of preparation of microcapsule composite materials, can solve the problems of short aging period, poor stability and bad smell of isocyanate, and achieve the effects of short aging period, high encapsulation rate and easy transportation.

Inactive Publication Date: 2017-09-08
NORTHEAST FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a urea-formaldehyde resin-wrapped isocyanate microcapsules to solidify the liquid isocyanate, solve the problem of short aging period and poor stability of isocyanate, and cover up bad smell

Method used

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  • Urea formaldehyde resin-coated isocyanate microcapsule and preparation method thereof
  • Urea formaldehyde resin-coated isocyanate microcapsule and preparation method thereof
  • Urea formaldehyde resin-coated isocyanate microcapsule and preparation method thereof

Examples

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preparation example Construction

[0043] The present invention also provides a preparation method of the urea-formaldehyde resin-wrapped isocyanate microcapsules described in the above technical solution, comprising the following steps:

[0044] (1) carry out condensation reaction after formaldehyde, urea and alkaline pH regulator are mixed, obtain urea-formaldehyde resin prepolymer;

[0045] (2) mixing the urea-formaldehyde resin prepolymer obtained in the step (1) with an emulsifier, a system stabilizer and water to obtain an aqueous phase;

[0046] mixing isocyanate and isocyanate protecting agent to obtain an oil phase;

[0047] emulsifying the water phase and the oil phase to obtain an emulsion;

[0048] (3) The emulsion obtained in the step (2) is mixed with an acidic pH regulator and then cured to obtain isocyanate microcapsules wrapped in urea-formaldehyde resin.

[0049] In the invention, the formaldehyde, urea and alkaline pH regulator are mixed and condensed to obtain the urea-formaldehyde resin p...

Embodiment 1

[0064] The microcapsules of urea-formaldehyde resin-wrapped isocyanate of the present embodiment are prepared from raw materials according to the following weight percentages: water: 29%; formaldehyde (37% by mass fraction): 5%; urea: 2%; emulsifier: 0.1 %; system stabilizer: 0.2%; isocyanate: 17%; isocyanate protective agent: 2%; acidic pH regulator 0.05%; alkaline pH regulator 0.05%.

[0065] Wherein, the emulsifier is sodium dodecylbenzene sulfonate; the system stabilizer is polyvinyl alcohol; the isocyanate is polymethylene polyphenyl polyisocyanate (PAPI); the isocyanate protective agent is toluene, and the alkaline pH regulator is hydrogen Sodium oxide; the acidic pH adjuster is hydrochloric acid.

[0066] The specific preparation method is as follows:

[0067] Put the formaldehyde solution and urea into the kettle and stir until dissolved, add an alkaline pH regulator to make the pH 8, and at 60°C, mechanically stir at 900rpm to undergo condensation reaction for 60min ...

Embodiment 2

[0077] The raw materials and preparation steps of Example 2 are exactly the same as those of Example 1, and the only difference from Example 1 is that the rotational speed of the condensation reaction for preparing the urea-formaldehyde resin prepolymer is 800rpm.

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Abstract

The invention provides a urea formaldehyde resin-coated isocyanate microcapsule and belongs to the field of microcapsule composite material preparation. The urea formaldehyde resin-coated isocyanate microcapsule is prepared from 29 to 53% by weight of water, 1.85 to 17.02% by weight of formaldehyde, 2 to 27% by weight of urea, 0.1 to 2% by weight of an emulsifier, 0.2 to 6% by weight of a system stabilizer, 17 to 32% by weight of isocyanate, 2 to 6% by weight of an isocyanate protecting agent, 0.05 to 3% by weight of an acidic pH adjuster and 0.05 to 3% by weight of an alkaline pH adjusting agent. The urea formaldehyde resin-coated isocyanate microcapsule utilizes urea formaldehyde resin as a capsule coating isocyanate so that liquid isocyanate forms a solid state. The method prevents isocyanate volatilization, masks odor of isocyanate and prolongs an isocyanate use time. The urea formaldehyde resin-coated isocyanate microcapsule has high activity and controllable particle sizes and is easy to transport and store.

Description

technical field [0001] The invention relates to the field of preparation of microcapsule composite materials, in particular to a urea-formaldehyde resin-wrapped isocyanate microcapsule and a preparation method thereof. Background technique [0002] Polyurethane is widely used in foam plastics, elastomers, adhesives, coatings, etc. due to its properties of wear resistance, low temperature resistance, and chemical reagent resistance. Isocyanate is one of the most important raw materials for polyurethane synthesis. Because it contains more active isocyanate groups, it has excellent reactivity and cementation performance, and its molecular structure is easy to design. It is widely used in construction, light industry, agriculture, chemical industry, transportation, and aviation. It is widely used in various material fields such as aerospace, medical and health and other daily life, national economy and national defense construction. [0003] However, because isocyanate has poor...

Claims

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Application Information

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IPC IPC(8): B01J13/02C08G12/12
CPCB01J13/02C08G12/12
Inventor 张彦华马杨豹顾继友谭海彦吕闪闪
Owner NORTHEAST FORESTRY UNIVERSITY
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