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A modified polyisocyanate composition and its preparation method

A technology of polyisocyanate and composition, which is applied in the field of modified polyisocyanate composition and its preparation, can solve the problems that leather cannot be applied, leather does not have resilience, and performance is single, so as to reduce personal injury, easy to control the reaction, The effect of high spraying efficiency

Active Publication Date: 2020-08-25
HEFEI KETIAN WATERBORNE TECH CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the leather prepared by the polyisocyanate composition in the prior art does not have resilience, the modified polyisocyanate composition cannot be applied to the leather field, resulting in a single performance of the modified polyisocyanate composition in the prior art

Method used

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  • A modified polyisocyanate composition and its preparation method
  • A modified polyisocyanate composition and its preparation method

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preparation example Construction

[0023] The invention provides a preparation method of a modified polyisocyanate composition, comprising the following steps:

[0024] 1) reacting monohydric alcohol and polyisocyanate under heating conditions, heating while stirring to obtain carbamate;

[0025] 2) Continue to add polyisocyanate, and conduct secondary reaction under the conditions of catalyst and heating at 100°C-150°C to generate polyisocyanate composition.

[0026] First, step 1) is performed: the monohydric alcohol and the polyisocyanate are reacted under heating conditions, and the mixture is heated while stirring.

[0027] Polyisocyanate is one of the main raw materials of polyurethane resin. Polyisocyanates used in the manufacture of polyurethane resin include diisocyanate, triisocyanate and their modified bodies. The polyisocyanate molecule contains two or more active sites, so when the polymerization reaction occurs, it can extend to two or three directions to form a linear or cross-linked (body) poly...

Embodiment 1

[0042] Weigh 62g (about 0.33mol) of analytically pure dodecanol in the reactor, weigh 75g (about 0.34mol) of isophorone diisocyanate (IPDI), slowly heat up to 80°C under stirring, and then keep at 80°C The reaction was carried out for 2h. Add 0.5 g of zinc isooctanoate, weigh 296 g (about 1.33 mol) of IPDI, slowly add it to the reaction system, and finish the addition in about 30 minutes, add IPDI while heating up, and after the addition, the temperature rises to 130 ° C, and the reaction is kept at 130 ° C for 4 hours. Immediately after the reaction is completed, the temperature is lowered, and the polyisocyanate composition can be obtained by discharging at about 60°C.

[0043] The polyisocyanate composition contained 21.4 wt% NCO groups, 52 wt% IPDI monomer, 28 wt% allophanate and 20 wt% isocyanurate. Polyisocyanate composition at 25°C and 200 seconds -1 The viscosity at a shear rate of 675 mPa / s.

Embodiment 2

[0045] 62g (about 0.33mol) dodecanol and 58g (about 0.33mol) toluene diisocyanate (TDI) were weighed in the reactor, and the temperature was slowly raised to 70°C under stirring, and then kept at 70°C for 3 hours. 0.35g of dibutyltin dilaurate was added, the temperature was raised to 120°C, 348g (about 2.00mol) of TDI was weighed, and slowly added to the reaction system for about 30min. After adding, the reaction was kept at 120°C for 4h. Immediately after the reaction is completed, the temperature is lowered, and the polyisocyanate composition liquid can be obtained by discharging at about 80°C.

[0046] The polyisocyanate composition 100% liquid product contained 17.6 wt% NCO groups, 58 wt% TDI monomer, 26 wt% allophanate and 16 wt% isocyanurate. Polyisocyanate composition at 25°C and 200 seconds -1 The viscosity at a shear rate of 890 mPa / s.

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Abstract

The invention provides a modified polyisocyanate composition and a preparation method thereof. The preparation method comprises the following steps: (1) enabling monohydric alcohol to react with polyisocyanate under a heating condition, carrying out heating while stirring; and (2) further adding the polyisocyanate, carrying out secondary reaction in the presence of a catalyst under the heating condition to generate a polyisocyanate composition, wherein the catalyst is selected from any one or two of an organic zinc compound, an organic tin compound, an organic alkali metal salt, tertiary amine and a salt compound thereof. The polyisocyanate composition with certain allophanate content is prepared from monohydric alcohol-modified polyisocyanate with a special functional group; polyurethane resin prepared from the polyisocyanate composition can show special functionality of the monohydric alcohol; meanwhile, the rebound resilience of the polyurethane resin is improved; and the modified polyisocyanate composition has the characteristics of high hydrophobicity and photocuring property.

Description

technical field [0001] The invention relates to the field of polyisocyanates, and specifically discloses a modified polyisocyanate composition and a preparation method thereof. Background technique [0002] There are a variety of modification methods for polyisocyanates, from which many kinds of isocyanate derivatives are obtained, such as isocyanate homopolymers based on diisocyanate trimers, polyol adducts, biurets, blocked isocyanates, these derivatives It is mostly used as a curing agent for two-component adhesives or coatings, and except for some HDI derivatives, which are liquid, others are mostly solid, which is inconvenient to use. It is not suitable for environmentally friendly water-based or solvent-free systems after solvent dilution. environmental pollution and health hazards. [0003] In the technology of allophanate-modified polyisocyanates, the blocked or unblocked polyisocyanate compositions with an average functionality greater than 2 are mostly modified by...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/75C08G18/79C08G18/76C08G18/81C08G18/73
CPCC08G18/73C08G18/755C08G18/758C08G18/7614C08G18/7657C08G18/791C08G18/8175
Inventor 郑广鹏戴家兵李维虎赵曦汪飞
Owner HEFEI KETIAN WATERBORNE TECH CO LTD
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