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Method for preparing polyurea coating materials for ships and cured film with polyurea coating materials

A coating material and technology for ships, which is applied in the field of preparation of polyurea coating materials for ships, can solve the problems of reducing coating uniformity and stability, agglomeration, and large specific surface area of ​​inorganic nanomaterials, achieving uniformity and Good stability, improved heat resistance and mechanical properties, easy and uniform dispersion effect

Active Publication Date: 2017-06-09
WUCHANG SHIPBUILDING IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large specific surface area of ​​inorganic nanomaterials, they are prone to agglomeration, which will reduce the uniformity and stability of the coating.

Method used

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  • Method for preparing polyurea coating materials for ships and cured film with polyurea coating materials
  • Method for preparing polyurea coating materials for ships and cured film with polyurea coating materials
  • Method for preparing polyurea coating materials for ships and cured film with polyurea coating materials

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preparation example Construction

[0028] The invention provides a method for preparing a polyurea coating material for ships, comprising:

[0029] dissolving the aliphatic isocyanate in a solvent to obtain an aliphatic isocyanate solution;

[0030] dissolving the amino-terminated polyether in a solvent to obtain an amino-terminated polyether solution;

[0031] Adding the amino-terminated polyether solution dropwise into the aliphatic isocyanate solution, and performing prepolymerization at room temperature to obtain a prepolymer;

[0032] Dissolving the amino polyhedral organosilsesquioxane chain extender in a solvent to obtain an amino polyhedral organosilsesquioxane solution;

[0033] Adding the amino polyhedral organosilsesquioxane solution into the prepolymer, stirring and reacting to obtain a reaction product, which is the polyurea coating material.

[0034] It can be seen from the above that since polypolyhedral organosilsesquioxane (POSS) is an organic-inorganic core-shell material with a hollow nanos...

Embodiment 1

[0063] Add 50g of hexamethylene diisocyanate (HDI) into 5g of N,N-dimethylacetamide (DMAc), and stir well; add 100g of amino-terminated polyether D2000 into 10g of DMAc and stir well; then The DMAc solution of polyether D2000 was added dropwise to the HDI solution at a rate of 5 ml / min, and prepolymerized for 0.5 hour to obtain a prepolymer. Then the DMAc solution (concentration is 0.5g / ml) that is dissolved with the amino POSS chain extender shown in 15g formula (I) is imported in the described prepolymer, and continues to stir 5 minutes, obtains the thick polyurea coating Material. Finally, the polyurea coating material was poured into a petri dish, placed in a fume hood to dry at room temperature for 48 hours, and then placed in an oven at 60° C. for 5 hours to obtain a cured film of the polyurea coating material.

Embodiment 2

[0065] Add 75g of hexamethylene diisocyanate (HDI) into 18g of toluene and stir evenly; add 100g of amino-terminated polyether D2000 into 25g of toluene and stir evenly; then add the toluene solution of aminopolyether D2000 at 20ml / min Add it dropwise to the HDI solution at a high speed, and prepolymerize for 1 hour to obtain a prepolymer. Then, a toluene solution (concentration of 1 g / ml) dissolved with 20 g of the amino POSS chain extender represented by formula (I) was introduced into the prepolymer, and the stirring was continued for 10 minutes to obtain a viscous polyurea coating material. Finally, the polyurea coating material was poured into a petri dish, placed in a fume hood to dry at room temperature for 48 hours, and then placed in an oven at 60° C. for 5 hours to obtain a cured film of the polyurea coating material.

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Abstract

The invention discloses a method for preparing polyurea coating materials for ships and a cured film with the polyurea coating materials, and belongs to the technical field of coatings for ships. The method includes dissolving aliphatic isocyanate in solvents to obtain aliphatic isocyanate solution; dissolving amino-terminated polyether in solvents to obtain amino-terminated polyether solution; dropwise adding the amino-terminated polyether solution into the aliphatic isocyanate solution, and carrying out pre-polymerization on the amino-terminated polyether solution and the aliphatic isocyanate solution at the normal temperature to obtain prepolymers; dissolving an amino poly-polyhedron organosilicon sesqui-simethicone chain extender in solvents to obtain amino poly-polyhedron organosilicon sesqui-simethicone solution, adding the amino poly-polyhedron organosilicon sesqui-simethicone solution into the prepolymers and carrying out stirring reaction on the amino poly-polyhedron organosilicon sesqui-simethicone solution and the prepolymers to obtain reaction products which are the polyurea coating materials. The method and the cured film have the advantages that amino poly-polyhedron organosilicon sesqui-simethicone is used as the chain extender, the aliphatic polyurea coating materials can be prepared by means of chemical modification, accordingly, the heat resistance and the mechanical performance of the polyurea coating materials can be improved, and the polyurea coating materials are good in stability.

Description

technical field [0001] The invention relates to the technical field of ship coatings, in particular to a preparation method of a polyurea coating material for ships and a cured film thereof. Background technique [0002] Polyurea is a new type of coating material that contains urea group (-NH-C(=O)-NH-) structure in the molecular chain developed on the basis of polyurethane coating. Compared with traditional polyurethane coatings, polyurea has better chemical stability, heat resistance and construction performance while retaining good mechanical properties. Since it was put into commercial use in 1991, polyurea has been widely used in the anticorrosion treatment of railways, bridges, pipelines, tanks, floors and other facilities, and has outstanding application effects. [0003] At present, the most commonly used polyurea is aromatic polyurea, and the isocyanate raw materials used contain benzene ring structure, such as diphenylmethane diisocyanate (MDI), toluene-2,4-diisoc...

Claims

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Application Information

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IPC IPC(8): C09D175/02C08G18/73C08G18/75C08G18/50C08G18/61C08G18/10
CPCC08G18/10C08G18/5024C08G18/61C08G18/73C08G18/755C09D5/18C09D175/02
Inventor 黄晓黎樊爱春尹园邓鹏飏
Owner WUCHANG SHIPBUILDING IND
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