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Single-component polyurethane sealant and low-temperature and rapid preparation method thereof

A polyurethane sealant, one-component technology, used in polyurea/polyurethane adhesives, adhesives, adhesive types, etc., can solve the problems of difficult water removal, long storage time, difficult reaction control, etc. The effect of equipment cost and labor cost, good storage stability and less side reactions

Active Publication Date: 2020-04-28
SHANDONG NORTH MODERN CHEM IND
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The one-step method is to prepare prepolymer in the presence of fillers. The general method is to mix polyols, plasticizers and fillers in a reactor, heat to 120-150°C, and then vacuum dehydrate to consume the moisture in the system. After the moisture content reaches the specified requirements, cool down to below 60°C, add polyisocyanate, catalyst and functional additives and stir to get the finished product. When the system cools down to below 60°C, a large amount of tap water is needed to cool down, because the temperature is too high to add isocyanate and The risk of implosion in the system after the catalyst is increased. The conventional one-step method mainly has the following problems: first, the preparation time is long, and resources, especially water resources, are seriously wasted; The water is removed completely, so there are many side reactions in the system, and the reaction is difficult to control;
[0004] The two-step method is to prepare the PU prepolymer first, and then add fillers, catalysts, functional additives and other raw materials. First, polyols and polyisocyanates are used to prepare polyurethane prepolymers for use. It takes 4 to 5 hours. Among them, polyols and aromatic isocyanates The reactivity of polyol and aliphatic isocyanate is relatively low, and it is necessary to add a catalyst to react at 60-80°C for 3-6 hours. The tap water is cooled to 50°C for standby; secondly, raw materials such as plasticizer, water remover, filler, catalyst and functional additive are added to the polyurethane prepolymer, and this process takes 2 to 4 hours;
[0005] And because the performance of a single prepolymer cannot satisfy the single-component polyurethane sealant of many different properties, so to prepare a variety of polyurethane prepolymers with different characteristics, multiple reactors for preparing prepolymers are required; and because the prepolymer High activity, long storage time, self-crosslinking and thickening will occur, and the content of active group NCO will decrease, which will affect the performance and storage stability of the prepared polyurethane sealant

Method used

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  • Single-component polyurethane sealant and low-temperature and rapid preparation method thereof
  • Single-component polyurethane sealant and low-temperature and rapid preparation method thereof

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preparation example Construction

[0069] The present invention also includes the preparation method of one-component polyurethane sealant, comprises the following steps:

[0070] ①In parts by weight, add 15-30 parts of plasticizer to the reaction kettle, heat up to 60-100°C, add 15-55 parts of filler, 0.2-2 parts of water remover, 0.00001-0.002 parts of catalyst, stir 0.5 ~ 1 hour, stop heating to obtain a uniform paste, the viscosity of the paste is generally 0.4 × 10 6 ~8×10 6 mPa s;

[0071] ② Add 8-45 parts of polyol and 1-10 parts of polyisocyanate to the paste obtained in step ①, control the temperature at 45-80°C, stir for 0.5-1 hour, add 0.00001-0.02 parts of catalyst to it, the function aids 0 to 10 parts of agent, continue to stir and react for 10 to 30 minutes, and control the temperature at 45 to 60°C to obtain a single-component polyurethane sealant masterbatch with a viscosity of generally 0.4×10 6 ~8×10 6 mPa s;

[0072] ③Add the remaining parts by weight of the catalyst and the remaining p...

Embodiment 1

[0092] A one-component polyurethane sealant, consisting of the following raw materials: polyol 8kg, polyisocyanate 1kg, plasticizer 15kg, water remover 0.2kg, filler 15kg and catalyst 0.1kg;

[0093] Described polyol is polyether polyol;

[0094] Described polyisocyanate is diphenylmethane diisocyanate;

[0095] Described plasticizer is phenyl alkyl sulfonate;

[0096] The water removal agent is p-toluenesulfonyl isocyanate;

[0097] The filler is nanometer calcium carbonate;

[0098] The catalyst is dibutyltin dilaurate.

Embodiment 2

[0100] A one-component polyurethane sealant, consisting of the following raw materials: 45kg polyol, 10kg polyisocyanate, 30kg plasticizer, 2kg water remover, 55kg filler, 15kg functional additive and 1kg catalyst;

[0101] Described polyol is polyester polyol;

[0102] Described polyisocyanate is toluene diisocyanate;

[0103] Described plasticizer is didecyl phthalate;

[0104] Described dewatering agent is triethyl orthoformate;

[0105] The filler is carbon black;

[0106] The catalyst is N-ethylmorpholine;

[0107] The functional auxiliary agent is a thixotropic hydrophobic fumed silica.

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Abstract

A single-component polyurethane sealant and a low-temperature rapid preparation method thereof have the advantages that the single-component polyurethane sealant is high in tensile strength, shearingstrength and tearing strength, moderate in viscosity and good in storage stability; according to the preparation method of the single-component polyurethane sealant, the time is short, the preparationof the product can be completed within 2-3 hours, and the production efficiency is high; the reaction temperature in the preparation process does not exceed 100 DEG C; the preparation method of the single-component polyurethane sealant has the advantages of short high-temperature reaction time retention time, few reaction side reactions and low energy consumption, the preparation process is simple and easy to operate, the preparation can be completed by using the existing equipment, the preparation of the prepolymer is not limited in a reaction kettle any more, and the equipment cost and thelabor cost are greatly reduced; according to the preparation process of the single-component polyurethane sealant, prepolymer molecules always coexist with filler and functional additive molecules inthe production and formation processes, organic materials and inorganic materials can be better matched and interwoven, and the shearing strength, the tensile strength and the elongation at break of the product are improved.

Description

technical field [0001] The invention relates to the technical field of adhesives, in particular to a single-component polyurethane sealant and a low-temperature, rapid preparation method. Background technique [0002] The one-component moisture-curing polyurethane sealant is composed of NCO-terminated polyurethane prepolymers, fillers, plasticizers, catalysts, and functional additives. There are two methods for preparing one-component moisture-curing polyurethane sealants: One-step and two-step methods. [0003] The one-step method is to prepare prepolymer in the presence of fillers. The general method is to mix polyols, plasticizers and fillers in a reactor, heat to 120-150°C, and then vacuum dehydrate to consume the moisture in the system. After the moisture content reaches the specified requirements, cool down to below 60°C, add polyisocyanate, catalyst and functional additives and stir to get the finished product. When the system cools down to below 60°C, a large amount...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J175/06
CPCC09J175/08C09J175/06
Inventor 董斌杜厚俊王玉东张健伟赵玉萍安靖
Owner SHANDONG NORTH MODERN CHEM IND
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