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A kind of single-component polyurea building sealant and preparation method thereof

A polyurea and sealant technology, applied in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve problems such as bulging, foaming, and free TDI toxicity, and achieve convenient construction and a smooth and beautiful appearance , Improve the effect of sealing protection level

Active Publication Date: 2020-04-14
BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a novel polyurea building sealant to solve the foaming and bulging problems of the polyurethane building sealant under high temperature and high humidity conditions, and simultaneously solve the toxicity problem of free TDI in the polyurethane sealant

Method used

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Examples

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preparation example Construction

[0048] Another aspect of the present invention provides the preparation method of above-mentioned one-component polyureide building sealant, and this preparation method comprises:

[0049] (1) Mix the polymer containing at least two acidic functional groups and the optional plasticizer uniformly, heat up and vacuum dehydrate;

[0050] (2) then lowering the temperature, mixing the mixture obtained in step (1), polycarbodiimide, dry filler, dry thixotropic agent and optional pigment;

[0051] (3) lowering the temperature again, mixing the mixture obtained in step (2), the chain extender and optional auxiliary agents;

[0052] (4) uniformly mixing the mixture obtained in step (3) with the catalyst, and removing air bubbles to obtain the one-component polyureide building sealant.

[0053] In the present invention, both the dried filler and the dried thixotropic agent are preferably dried at 110-130° C. for 10-14 hours.

[0054] According to the present invention, preferably, in ...

Embodiment 1

[0064] This embodiment provides a black high modulus single-component polyurea building sealant, the specific preparation method is as follows:

[0065] Add 8 parts of polymers containing at least two acidic functional groups in parts by mass, 5 parts of phenyl sulfonate (Mesamoll plasticizer from Lanxess, Germany), heat up to 120°C, vacuum dehydrate for 3 hours, and then cool down to 70°C , add 20 parts of polycarbodiimide, stir in vacuum at high speed for 0.5 hours, add 32 parts of heavy calcium carbonate (pre-dried at 120°C for 12 hours), stir in vacuum at high speed for 0.5 hours, add 9.5 parts of nano-calcium carbonate (pre-dried at 120°C 12h), 0.5 parts of carbon black, stirred at high speed in vacuum for 0.5 hours, cooled down to 50°C again, added 1 part of chain extender maleic anhydride, 0.5 parts of silane coupling agent (KH550), 1 part of antioxidant 1010, and continued vacuum stirring for 0.5 hour, add 0.5 part of catalyst dibutyltin dilaurate, continue vacuum stir...

Embodiment 2

[0068] This embodiment provides a black low modulus polyurea building sealant, the specific preparation method is as follows:

[0069] Add 30 parts of polymers containing at least two acidic functional groups in parts by mass, 15 parts of plasticizers, heat up to 120°C, vacuum dehydrate for 3 hours, then cool down to 70°C, add 15 parts of polycarbodiimide, vacuum at high speed Stir for 0.5 hours, add 27 parts of light calcium carbonate (pre-dried at 120°C for 12 hours), stir in vacuum at high speed for 0.5 hours, add 8.5 parts of nano-calcium carbonate (pre-dried at 120°C for 12 hours), 0.5 parts of carbon black, and stir at high speed in vacuum for 0.5 hour, cool down to 50°C again, add 1 part of maleic anhydride, 0.5 part of silane coupling agent, 1 part of antioxidant, 1 part of ultraviolet absorber, continue vacuum stirring for 0.5 hour, add 0.5 part of bismuth neodecanoate, continue vacuum Stir for 0.5h, remove air bubbles, and discharge to obtain a one-component polyurea...

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Abstract

The invention discloses a single-component polyureide building sealant and a preparation method thereof. The sealant comprises polyureide, a thixotropic agent, filler, a chain extender, a catalyst andoptional pigment, plasticizer and assistant, wherein the polyureide is prepared by reacting a polycarbodiimide and a polymer comprising at least two acidic functional groups; and calculated in partsby mass, the polycarbodiimide is 10-25 parts, the polymer comprising at least two acidic functional groups is 5-30 parts, the thixotropic agent is 2-15 parts, the filler is 10-50 parts, the chain extender is 0.1-10 parts, the catalyst is 0.01-1 part, the pigment is 0-5 parts, the plasticizer is 0-20 parts and the assistant is 0-5 parts. The single-component polyureide building sealant is capable of solving problems that a polyurethane sealant is bubbled in high-temperature high-humidity conditions in summer and a volume of the sealant after solidified is shrunk. The prepared polyureide sealantis rapidly solidified in the high-temperature high-humidity conditions, and a bubble bulge cannot be generated.

Description

technical field [0001] The invention belongs to the technical field of building sealant materials, and more specifically relates to a single-component polyureide building sealant and a preparation method thereof. Background technique [0002] Sealants in the construction field are mainly used for sealing applications in houses and civil engineering, as well as in the processing of energy-saving door and window glass; including high-rise building panels and interior wall joints, joints of prefabricated building prefabricated parts, door and window frames Joints with door and window glass, caulking and sealing of glass curtain walls, joints of prefabricated concrete slabs, marble, etc., joints of ultra-clean workshops and cold storage, filling and leveling of gaps around kitchens, surrounding shower rooms, bathtubs, and urinals Sealing, etc., caulking and sealing of expansion joints of high-grade roads, bridges, and airstrips, caulking of expansion joints of anti-collision wal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J175/02C08G71/02
Inventor 赵鹏
Owner BEIJING ORIENTAL YUHONG WATERPROOF TECH CO LTD
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