Amide oligomer and polyamide paste rheological aid prepared by swelling same

A technology of polyamide paste and rheological additives, applied in the field of coating additives, can solve the problems of high cost of long-chain aliphatic amine end-capping agents, achieve a good balance between leveling and anti-sag performance, avoid dripping, The effect of improving leveling performance

Inactive Publication Date: 2013-07-03
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 system and does not interfere with coating resins such as polyurethane Chemical reaction occurs to damage the stability of the system, and the cost of the long-chain aliphatic amine end-capping agent used is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] 1. Synthesis of polyamide wax

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

[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°C, add 200g of toluene / ethanol mixed so...

Embodiment 2

[0052] 1. Synthesis of polyamide wax

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

[0054] 2. Controlled swelling to prepare rheological additives

[0055] Add 50g of the polyamide fine powder obtained in step 1 to the disperser, the circulating water temperature is 45°C, add 200g of toluene...

Embodiment 3

[0057] 1. Synthesis of polyamide wax

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

[0059] 2. Controlled swelling to prepare rheological additives

[0060] Add 50g of the polyamide fine powder obtained in step 1 to the disperser, the circulating water temperature is 45°C, add 200g of toluene / ethanol mix...

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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, in particular to an amide oligomer and a polyamide paste rheological assistant prepared by swelling thereof. The polyamide paste rheological assistant can be used for preparing coatings to control the rheology of coating systems characteristic. Background technique [0002] In the various stages of coating production and use, the control of coating rheological properties is an important factor that must be considered, among which, imparting thixotropy to the coating fluid system can achieve good application effects. For example, by adding some additives to the coating, the thixotropy can improve the coating performance. The coating system has a high viscosity at low shear rate, that is, when standing for storage or after brushing construction, which can prevent the construction of the coating. Sag on the surface, delaying the settling of pigments and fillers in the coating formulation and preven...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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