Modified polyisocyanate composition and preparation method thereof

A technology of polyisocyanate and isocyanurate, which is applied in the field of polyisocyanate, can solve the problems that leather cannot be applied, leather has no resilience, and performance is single, and achieve the effects of reducing personal injury, easy control of reaction, and high spraying efficiency

Active Publication Date: 2017-10-31
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 co

Method used

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  • Modified polyisocyanate composition and preparation method thereof

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preparation example Construction

[0023] The invention provides a kind of preparation method of the modified polyisocyanate composition, comprises 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 carry out secondary reaction under the condition of catalyst and heating at 100°C-150°C to generate polyisocyanate composition.

[0026] Firstly, step 1) is carried out: react the monohydric alcohol and the polyisocyanate under heating conditions, and heat while stirring.

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

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 Reaction 2h. Add 0.5 g of zinc isooctanoate, weigh 296 g (about 1.33 mol) of IPDI, slowly add it into the reaction system, and finish adding in about 30 minutes. While adding IPDI, raise the temperature. After the addition, the temperature rises to 130° C. After the reaction is completed, the temperature is lowered immediately, and the polyisocyanate composition can be obtained by discharging at about 60°C.

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

Embodiment 2

[0045] Weigh 62g (about 0.33mol) of dodecanol and 58g (about 0.33mol) of toluene diisocyanate (TDI) in the reactor, slowly raise the temperature to 70°C under stirring, and then keep it at 70°C for 3h. Add 0.35g of dibutyltin dilaurate, raise the temperature to 120°C, weigh 348g (about 2.00mol) of TDI, slowly add it into the reaction system, add it in about 30 minutes, and keep it at 120°C for 4 hours after the addition. Immediately after the reaction, 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% by weight of NCO groups, contained 58% by weight of TDI monomer, 26% by weight of allophanate and 16% by weight of isocyanurate. polyisocyanate composition at 25°C and 200 sec -1 The viscosity at the shear rate is 890mPa / 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 polyisocyanate, and specifically discloses a modified polyisocyanate composition and a preparation method thereof. Background technique [0002] There are many ways to modify polyisocyanate, so that many kinds of isocyanate derivatives can be obtained, such as isocyanate homopolymer mainly composed of diisocyanate trimer, polyol adduct, biuret, blocked isocyanate, these derivatives Most of them are used as curing agents for two-component adhesives or coatings, and except some HDI derivatives are liquid, others are mostly solid, which is inconvenient to use. After dilution with solvents, they are not suitable for environmentally friendly water-based or solvent-free systems, and have environmental pollution and health hazards. [0003] In the allophanate modified polyisocyanate technology, the blocked or unblocked polyisocyanate compositions with an average functionality greater than 2 are mostly modified with polyf...

Claims

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Application Information

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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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