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Waterborne polyurethane emulsion with flexural endurance and preparation method thereof

A water-based polyurethane and bending-resistant technology, which is applied in the field of water-based polyurethane emulsion and its preparation, can solve the problems of decreased adhesion of substrates, poor synthesis placement stability, and decreased flatness of composite materials, etc., and achieve good permeability.

Inactive Publication Date: 2016-12-21
SHANGHAI WEIKAI CHEM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of the former, substrate adhesion and other physical properties will be significantly reduced, while the latter has defects such as poor synthesis and placement stability, leveling, and flatness of composite materials.

Method used

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  • Waterborne polyurethane emulsion with flexural endurance and preparation method thereof
  • Waterborne polyurethane emulsion with flexural endurance and preparation method thereof
  • Waterborne polyurethane emulsion with flexural endurance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The present embodiment polyurethane emulsion adopts the following components and the raw material of content to prepare:

[0034] a

Toluene diisocyanate

35g

b

Polyether diol (molecular weight 2000)

160g

c

Isophorone diisocyanate

290g

d

Polyester diol (molecular weight 3000)

300g

e

dimethylolbutyric acid

140g

f

Butanediol

110g

g

Neutralizer

70g

h

Diethylenetriamine

40g

i

acetone

1000g

j

Deionized water

2060g

[0035] Above-mentioned polyurethane emulsion is prepared according to the following processing steps:

[0036] Component b was stirred and dehydrated at 85° C. under vacuum, and the stirring speed was 200 rpm. After the water content in component b is less than 200ppm, stop vacuuming and return to normal pressure, lowering to 65°C. Keep stirring and add component a, keep the reaction at 65°C for 2 hours before use, the whole is c...

Embodiment 2

[0041] The present embodiment polyurethane emulsion adopts the following components and the raw material of content to prepare:

[0042]

[0043]

[0044] Above-mentioned polyurethane emulsion is prepared according to the following processing steps:

[0045] Component b was stirred and dehydrated at 85° C. under vacuum, and the stirring speed was 200 rpm. After the water content in component b is less than 200ppm, stop vacuuming and return to normal pressure, lowering to 65°C. Keep stirring and add component a, keep the reaction at 65°C for 2 hours before use, the whole is component A.

[0046] Component d was stirred and dehydrated at 85° C. under vacuum, and the stirring speed was 200 rpm. After the water content in component d is less than 200ppm, stop vacuuming and return to normal pressure, and keep at 85°C. Keep stirring and add component c, keep the reaction at 85°C for 2h, add component A and mix for 15min. Component e was then added, and the reaction was con...

Embodiment 3

[0050] The present embodiment polyurethane emulsion adopts the following components and the raw material of content to prepare:

[0051] a

diphenylmethane diisocyanate

60g

b

Polyether diol (molecular weight 2000)

140g

c

4,4'-Dicyclohexylmethane diisocyanate

288g

d

Polyester diol (molecular weight 3500)

350g

e

Dimethylolpropionic acid

118g

f

Butanediol

90g

g

Neutralizer

58g

h

isophorone diamine

79g

i

acetone

1100g

j

Deionized water

2140g

[0052] Above-mentioned polyurethane emulsion is prepared according to the following processing steps:

[0053] Component b was stirred and dehydrated at 85° C. under vacuum, and the stirring speed was 200 rpm. After the water content in component b is less than 200ppm, stop vacuuming and return to normal pressure, lowering to 65°C. Keep stirring and add component a, keep the reaction at 65°C for 2 hours befor...

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Abstract

The invention provides a waterborne polyurethane emulsion with flexural endurance and a preparation method thereof. The emulsion comprises water and resin. The resin contains the following reaction components: aliphatic diisocyanate, aromatic diisocyanate, polyester polyol, polyether polyol, a hydrophilic chain-extender, a short-chain chain extender and a post chain extender. The preparation method comprises the following steps: letting polyether polyol react with aromatic diisocyanate to obtain a component A; letting the component A react with aliphatic diisocyanate and polyester polyol to obtain a component B; adding the hydrophilic chain-extender into the component B and reacting, adding the short-chain chain extender and reacting, cooling to 50 DEG C below, adjusting pH value and viscosity, adding water, and carrying out an emulsion reaction to obtain the waterborne polyurethane emulsion with flexural endurance. By preferentially carrying out a reaction between polyether polyol and aromatic diisocyanate, adverse effects of system hyperviscosity and solidification due to high crystallinity of aromatic diisocyanate are avoided.

Description

technical field [0001] The invention relates to a bending-resistant water-based polyurethane emulsion and a preparation method thereof, belonging to the technical field of water-based coatings. Background technique [0002] Polyurethane (PU) is a polymer synthetic material with properties between rubber and plastics. Due to the microphase separation of the "soft segment" and "hard segment" in its main chain structure, the soft segment provides the elasticity and flexibility of the PU material. Toughness and low temperature performance, while the hard segment provides the hardness, strength and modulus properties of PU materials. The polyurethane can not only have the elasticity of rubber but also the hardness of plastic, with a wide range of adjustment and a wide range of applications. [0003] When synthetic polyurethane is applied to the coating on the surface of the packaging, since the product often needs to be bent multiple times and finally shaped into a packaging box...

Claims

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Application Information

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IPC IPC(8): C08G18/76C08G18/75C08G18/66C08G18/48C08G18/42C08G18/34C08G18/32C08G18/12
CPCC08G18/7614C08G18/12C08G18/42C08G18/4825C08G18/755C08G18/758
Inventor 董海普李斐谢允斌
Owner SHANGHAI WEIKAI CHEM
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