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Vinyl hyperbranched waterborne polyurethane for UV-LED curing and preparation method thereof

A UV-LED and hyperbranched polyurethane technology, applied in polyurea/polyurethane coatings, coatings, etc., can solve the problems of high shrinkage rate and low resin reactivity, and improve flexibility, reactivity and dispersion stability. Solve the effect of excessive shrinkage

Inactive Publication Date: 2018-10-12
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] The present invention aims at the low reactivity of the existing UV curable resin when used for UV-LED curing, and provides a method that improves the reactivity and dispersion stability of the double bond at the end of the hyperbranched structure, and solves the problem of curing high-functionality monomers. UV-LED curing vinyl hyperbranched water-based polyurethane and preparation method thereof with high shrinkage rate

Method used

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  • Vinyl hyperbranched waterborne polyurethane for UV-LED curing and preparation method thereof
  • Vinyl hyperbranched waterborne polyurethane for UV-LED curing and preparation method thereof
  • Vinyl hyperbranched waterborne polyurethane for UV-LED curing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] When the synthetic raw materials of hyperbranched polyurethane are isophorone diisocyanate (IPDI), neopentyl glycol (NPG) and diethanolamine (DEOA), the relationship between algebra and NCO value, hydroxyl number and relative molecular mass of hyperbranched polyurethane As in Table 1a:

[0043] Table 1a

[0044]

[0045] The first step, the synthesis of hyperbranched polyurethane

[0046] The formula of hyperbranched polyurethane is shown in Table 1b:

[0047] Table 1b

[0048]

[0049] Add 50.0 parts of IPDI and 0.03 parts of Kat 24 into the reactor, raise the temperature to 35°C, take 11.7 parts of NPG and dissolve it in 11.03 parts of acetone, add dropwise, finish dropping in 30 minutes, continue to react for 30 minutes after dropping, and synthesize A 2 Intermediate: Cool down to 5°C, dissolve 11.8 parts of DEOA in 11.0 parts of acetone, add dropwise, drop for 30 minutes, continue to react for 30 minutes after dropping, and synthesize AB 2 Intermediate; he...

Embodiment 2

[0067] When the synthetic raw materials of hyperbranched polyurethane are isophorone diisocyanate (IPDI), 2,4-diethyl-1,5-pentanediol (PD-9) and diisopropanolamine (DIPA), the algebraic The relationship with the NCO value, hydroxyl number and relative molecular mass of hyperbranched polyurethane is shown in Table 2a:

[0068] Table 2a

[0069]

[0070] The first step, the synthesis of hyperbranched polyurethane

[0071] The formula of hyperbranched polyurethane is shown in Table 2b:

[0072] Table 2b

[0073]

[0074] Add 45.5 parts of IPDI and 0.03 parts of Kat 320 into the reactor, raise the temperature to 40°C, dissolve 16.5 parts of PD-9 in 5.0 parts of acetone, add dropwise, and finish dropping in 30 minutes. Continue to react for 40 minutes after dropping, and synthesize A 2 Intermediate: Cool down to 5°C, take 14.0 parts of DIPA and dissolve in 16.23 parts of acetone, add dropwise, drop over 30 minutes, continue to react for 30 minutes after dropping, synthesiz...

Embodiment 3

[0090] When the synthetic raw materials of hyperbranched polyurethane are toluene diisocyanate (TDI), 1,4-butanediol (BDO) and diethanolamine (DEOA), the relationship between algebra and NCO value, hydroxyl number and relative molecular mass of hyperbranched polyurethane As in Table 3a:

[0091] Table 3a

[0092]

[0093] The first step, the synthesis of hyperbranched polyurethane

[0094] The formula of hyperbranched polyurethane is shown in Table 3b:

[0095] Table 3b

[0096]

[0097] Take 47.5 parts of TDI and add it to the reactor, raise the temperature to 35°C, take 12.4 parts of BDO and dissolve it in 5.0 parts of acetone, add dropwise, and finish dropping in 20 minutes. Continue to react for 30 minutes after dropping, and synthesize A 2 Intermediate: Cool down to 0°C, dissolve 14.5 parts of DEOA in 15.85 parts of acetone, add dropwise, finish dropping in 35 minutes, continue to react for 20 minutes after dropping, and synthesize AB 2 Intermediate; heat up to ...

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Abstract

The invention discloses vinyl hyperbranched waterborne polyurethane for UV-LED curing and a preparation method thereof, and the preparation method comprises the following steps: 1) preparing a terminal-NCO-group-containing intermediate A2 by reacting of diisocyanate with a dihydric alcohol, and reacting the terminal-NCO-group-containing intermediate A2 with a branching agent at low temperature tosynthesize an AB2 intermediate, and reacting at 40-55 DEG C to prepare hydroxyl-group-containing hyperbranched polyurethane; 2) reacting diisocyanate with a hydrophilic monomer and then with hydroxy (meth) acrylate to obtain a semi-adduct containing a NCO group and a hydrophilic group; and 3) adding the hydroxyl-group-containing hyperbranched polyurethane into a reactor to react with the semi-adduct containing the hydrophilic group until the content of the NCO is less than 0.1%, and neutralizing and emulsifying to obtain the vinyl hyperbranched waterborne polyurethane. The hyperbranched waterborne polyurethane prepared by the method contains the vinyl functionality high up to 16, the molecular weight, the vinyl functionality, the film hardness and flexibility of the product are easy to adjust by formulation and process, and the vinyl hyperbranched waterborne polyurethane for UV-LED curing is very suitable for preparing waterborne UV-LED curing coatings.

Description

technical field [0001] The invention relates to the field of preparation of UV-curable coatings, in particular to a preparation method for UV-LED curing vinyl hyperbranched waterborne polyurethane. Background technique [0002] UV curing refers to a process in which a substance changes from a low molecular weight to a high molecular weight under the irradiation of ultraviolet light, which is different from ordinary thermal curing, natural curing and crosslinking agent curing. The curing mechanism is as follows: light irradiation causes the photoinitiator to crack into free radicals or anions and cations, further triggers the polymerization reaction of monomers containing active groups, and polymerizes into an insoluble and infusible solid coating film. Compared with traditional curing technology, UV curing technology saves energy, has fast curing speed, good coating performance, and is suitable for large-scale industrial production. [0003] Conventional solvent-based UV cu...

Claims

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Application Information

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IPC IPC(8): C08G18/83C08G18/66C08G18/32C08G18/67C08G18/48C08G18/34C09D175/14
CPCC08G18/3206C08G18/3275C08G18/348C08G18/48C08G18/672C08G18/833C09D175/14C08G18/6674
Inventor 朱延安段晓俊瞿金清
Owner SOUTH CHINA UNIV OF TECH
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