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A self-skinning modified polyurethane heat-curing sealant composition and preparation method thereof

A polyurethane, thermal curing technology, applied in the direction of polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of high use location and process requirements, poor finishing, few coatings, etc., to achieve excellent Excellent mechanical properties, excellent adhesive properties, and storage stability

Active Publication Date: 2021-04-13
BEIJING COMENS NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For the general position of the body, the electrophoretic fluid and the paint coating can play a good role in protecting, but on the cut surface of some plates, there is very little coating, and these positions will often reduce the service life of the body
At present, for car body processing and cutting, joints, and welds, caulking materials are usually used to seal and waterproof. Electrophoresis and painting require high-temperature treatment. Ordinary polyurethane sealing materials will bubble after high-temperature baking, resulting in cracking of the paint surface.
In order to solve this problem, the common sealant for this purpose on the market is mainly silicone modified polyether sealant. Although this type of sealant can withstand higher temperatures, its finishing is not as good as that of polyurethane sealant, and it may peel off from the paint surface. Phenomenon, and the skinning and curing time is long, the process operation is complicated
In addition, there are also PVC sealants used to seal the welds, but this type of sealant cannot be self-cured and needs to be heat-treated. Using it in one position will cause water leakage, which will affect the durability of the car body, and the small molecular gas produced by baking will be harmful to the human body
For two-component products, there is a shelf life problem, and the special equipment required during use will also increase production costs

Method used

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  • A self-skinning modified polyurethane heat-curing sealant composition and preparation method thereof
  • A self-skinning modified polyurethane heat-curing sealant composition and preparation method thereof
  • A self-skinning modified polyurethane heat-curing sealant composition and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0033] (1) The isocyanate group-containing polyurethane prepolymer is prepared by reacting a polyol-containing compound with an isocyanate compound. The compound containing polyol is at least one of polyether polyol, polyester polyol, polycarbonate polyol, polyacrylate polyol, polyhydrocarbon polyol; the compound containing polyol is preferably poly Ether polyols or polyester polyols are preferably polyether polyols with a molecular weight of 1000-8000, most of which are difunctional or trifunctional polyether polyols. Described isocyanate compound is at least one in aromatic polyisocyanate or aliphatic polyisocyanate; Described isocyanate compound preferably adopts diisocyanate, preferably adopts toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), hexa Methylene diisocyanate (HDI), isophorone diisocyanate (IPDI). In practical applications, the polyurethane prepolymer containing isocyanate group is preferably prepared by reacting polyether polyol and diisocyanate ...

Embodiment 1

[0061] A self-skinning modified polyurethane heat-curing sealant composition, its preparation method may comprise the following steps:

[0062] Step a1, preparing a blend containing isocyanate-based polyurethane prepolymer and epoxy resin:

[0063] Add polyether polyol 330N, polyether polyol DL-2000, and plasticizer DIDP into the reactor, heat up to 120°C, vacuum dehydrate for 2 hours, then cool down to 60-80°C, add diphenylmethane diisocyanate ( MDI), let it react for 2~3h, add catalyst (dibutyltin dilaurate DBTDL diluted to 10% solution with plasticizer DIDP), continue to react for 1~2h, then add bisphenol A under stirring Glyceryl ether (DGEBA), and stirred at 80° C. for 1 to 2 hours until the NCO content reached 1.8%, and the reaction was stopped, thereby preparing a blend of polyurethane prepolymer containing isocyanate groups and epoxy resin.

[0064] Step a2, preparing modified polyurethane prepolymer:

[0065] Add polyether diol N210 and plasticizer DIDP into the rea...

Embodiment 2

[0069] A self-skinning modified polyurethane heat-curing sealant composition, which is basically the same as Example 1 of the present invention, the difference is that the amount of each raw material is different and that amidoamine and N, N-dimethyl urea instead of dicyandiamide.

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Abstract

The invention discloses a self-skinning modified polyurethane heat-curing sealant composition and a preparation method thereof. The self-skinning modified polyurethane heat-curing sealant composition comprises the following components in parts by weight: Polymer 15-40 parts, epoxy resin 5-20 parts, modified polyurethane prepolymer 2-10 parts, thermosetting agent or accelerator 0.2-5 parts, plasticizer 10-25 parts, water remover 0.3- 2 parts, 10-40 parts of filler, 3-20 parts of rheological additive, 0.1-10 parts of dye or pigment, 0.2-3 parts of latent curing agent, and 0.01-1 part of catalyst. The invention not only has good adhesion with metal plates, can quickly form strength, but also has excellent mechanical properties, does not bubble when heated, and is stable in storage, and is suitable for being used as a sealant for automobile body frames.

Description

technical field [0001] The invention relates to the field of polyurethane thermosetting sealants, in particular to a self-skinning modified polyurethane thermosetting sealant composition and a preparation method thereof. Background technique [0002] In the construction of the skeleton of the vehicle, each metal plate is connected to each other. In order to prevent corrosion as much as possible, the skeleton metal plate is mostly treated with electrophoresis and spray paint. These coatings play an important role in the corrosion resistance of the car and can prolong the service life of the vehicle. [0003] For the general position of the body, the electrophoretic fluid and the baking paint coating can play a very good role in protection, but on the cutting surface of some plates, there is very little coating, and these positions often reduce the service life of the body. At present, for car body processing and cutting, joints, and welds, caulking materials are usually used ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/04C09J11/04C09J11/06C08G18/76C08G18/58C08G18/48
CPCC08G18/4804C08G18/4825C08G18/58C08G18/7614C08G18/7671C08K2003/2206C08K2003/265C09J11/04C09J11/06C09J175/04C08L75/08C08K13/02C08K5/12C08K3/22C08K5/43C08K3/26C08K3/36C08K5/31C08K5/20C08K5/21
Inventor 温达罗善国
Owner BEIJING COMENS NEW MATERIALS