Amide oligomer and polyamide paste rheological aid prepared by swelling same

The technology of polyamide paste and rheology aid is applied in the field of coating aids, can solve the problem of high cost of long-chain aliphatic amine end capping agents, achieve a good balance between leveling and sag resistance, simple preparation steps, The effect of broad application prospects

Inactive Publication Date: 2010-10-20
GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] US Pat 5,180,802 discloses a method for preparing a monoamine-terminated non-reactive polyamide, the purpose of which is to obtain a polyamide without active hydrogen, which provides thixotropy for the coating ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Synthesis of polyamide wax

[0048] Add 25.0g of C to the reaction flask equipped with thermometer, condenser, water separator and stirring device 36 Dimerized fatty acid, 2.2g behenedioic acid, and 140g 6-hydroxycaproic acid, through N 2 , Heated to 90°C, added 94.4g of butanediamine, reacted at 95°C for 1h, heated to 120°C, added 0.5g of catalyst boron trifluoride ether, heated to 190°C, reacted for 4h, and removed by-products under reduced pressure. Cooling to obtain a light yellow waxy polyamide solid, the measured acid value is 5.1mgKOH / g, the amine value is 4.5mgKOH / g, and the melting point measured by DSC method is 141℃. It is pulverized into polyamide fine powder (average The particle size is 10μm).

[0049] 2. Controlled swelling to prepare rheological additives

[0050] Add 50g of the polyamide fine powder obtained in step 1 into the disperser, the circulating water temperature is 45℃, add 200g toluene / ethanol mixed solvent (volume ratio 90 / 10), stir and disperse...

Embodiment 2

[0052] 1. Synthesis of polyamide wax

[0053] Add 25.0g of C to the reaction flask equipped with thermometer, condenser, water separator and stirring device 36 Dimerized fatty acid, 2.2g behenedioic acid, 298.5g 12-hydroxyoleic acid (castor oil fatty acid), pass N 2 , Heated to 90°C, added 64.4g ethylenediamine, reacted at 95°C for 1h, heated to 120°C, added 0.5g catalyst boron trifluoride ether, heated to 150°C, reacted for 6h, and removed by-products under reduced pressure , Cooling to obtain a light yellow waxy polyamide solid, the measured acid value is 4.5mgKOH / g, the amine value is 5.0mgKOH / g, and the melting point measured by DSC is 137℃. It is pulverized into polyamide fine powder (average The particle size is 5μm).

[0054] 2. Controlled swelling to prepare rheological additives

[0055] Add 50g of the polyamide fine powder obtained in step 1 into the disperser, the circulating water temperature is 45℃, add 200g of toluene / ethanol mixed solvent (volume ratio is 90 / 10), stir...

Embodiment 3

[0057] 1. Synthesis of polyamide wax

[0058] Add 25.0g of C to the reaction flask equipped with thermometer, condenser, water separator and stirring device 36 Dimerized fatty acid, 1.2g sebacic acid, 296.4g sulfonated castor oil (saponification value 189.3), pass N 2 , Heat to 90°C, add 166.9g decanediamine, react at 95°C for 1h, heat up to 120°C, add 0.5g of catalyst trimethylchlorosilane, heat up to 200°C, react for 9h, remove by-products under reduced pressure , Cooling to obtain a light yellow waxy polyamide solid, DSC measured melting point of 133 ℃, measured acid value of 4.8mgKOH / g, amine value of 5.9mgKOH / g, pulverized into polyamide fine powder (average The particle size is 5μm).

[0059] 2. Controlled swelling to prepare rheological additives

[0060] Add 50g of the polyamide fine powder obtained in step 1 into the disperser, the circulating water temperature is 45℃, add 200g of toluene / ethanol mixed solvent (volume ratio is 90 / 10), stir and disperse at 1000rpm for about ...

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Abstract

The invention discloses an amide oligomer and a polyamide paste rheological aid prepared by swelling the same. A preparation method for the amide oligomer comprises the following steps of: putting aliphatic binary acid, aliphatic polyamine compound and aliphatic monobasic acid with a polar group and ester thereof into a reactor, adding a catalyst into the reactor, and reacting the mixture at the temperature of between 150 and 200 DEG C to obtain the amide oligomer. The polyamide has proper melting point and relative molecular weight; and after micro pulverization, the polyamide is dispersed into a mixed solvent containing aromatic hydrocarbon and alcohol and subjected to the controlled swelling at a lower temperature to form the polyamide paste rheological aid. The obtained polyamide paste rheological aid serving as an additive provides excellent coating performance for a coating system, namely has high viscosity during standing and good viscosity stability, prevents the powder in thesystem from settling and caking, has thinner viscosity during coasting and is easy for construction; the leveling property and the flowing resistance of a coated film are well balanced; and the polyamide paste rheological aid has broad application prospect in the coating industry.

Description

Technical field [0001] The invention belongs to the field of coating additives, and in particular relates to an amide oligomer and a polyamide paste rheology aid made by swelling thereof. The polyamide paste rheology aid can be used to prepare paints to control the rheology of the coating system characteristic. Background technique [0002] In the various stages of paint production and use, the control of the rheological properties of the paint is an important factor that must be considered. Among them, the thixotropy of the paint fluid system can be given a good application effect. For example, adding some additives to the paint, the thixotropy can improve the performance of the coating. Under the low shear rate of the coating system, that is, when it is stored or after painting, the fluid has a high viscosity, which can prevent the construction of the coating. Sag on the surface, delay the sedimentation of pigments and fillers in the coating formulation and prevent their aggre...

Claims

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Application Information

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IPC IPC(8): C07C231/02C07C235/10C07C235/28C07C303/22C07C309/62C07C233/38C07C319/12C07C323/60C07C233/36C09D7/12C08G69/26C08G69/42C08J3/11
Inventor 许凯时志刚方燕陈鸣才
Owner GUANGZHOU CHEM CO LTD CHINESE ACADEMY OF SCI
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