Finish for pre-coating coiled material

A technology for topcoats and coils, applied in coatings, polyester coatings, etc., can solve the problems of inability to cure the paint film and high curing temperature, and achieve the effect of suitable hardness, flexibility and reasonable matching

Inactive Publication Date: 2004-02-11
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

European patent EP686678 discloses a precoated coil topcoat prepared with polyester resin, amino resin or urea-formaldehyde resin, catalyst, pigment, wax, polysiloxane, polyacrylic acid, etc., although a t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0014] Example 1 Preparation of saturated polyester resin A

[0015] 1. The formula is shown in Table 1

[0016]

[0017] 2. Craft

[0018] In a clean reactor equipped with a thermometer, agitator, reflux condenser, and high-level tank, add all the other components in the formula except the catalyst into the reactor, blow carbon dioxide gas, and raise the temperature to 180°C within 1 hour, and start Stir. Add dibutyltin dilaurate, keep it at 180℃ for 1 hour, raise it to 205℃ and keep it for 30 minutes, continue heating to 230℃, keep it warm and dehydrate until the acid value is less than 5mgKOH / g, then cool down and discharge, and store away from light spare. The obtained saturated polyester resin A had a solid content of 65%.

Example Embodiment

[0019] Example 2 Preparation of fully blocked polyisocyanate A

[0020] 1. The formula is shown in Table 2

[0021]

[0022] In a clean reactor equipped with a thermometer, agitator, reflux condenser, and high-level tank, add xylene, N3390 and dibutyltin dilaurate and stir evenly, then add caprolactam all at once and keep it warm with ice water to keep the reaction temperature below 50°C, then keep it for 2 to 3 hours to ensure the reaction is complete. Then add ethylene glycol ether and control the dropping rate to ensure that the temperature is below 50℃. Finally, add polyether N-220, raise the temperature to 100~120℃, keep it for 2~3 hours, and determine when the NCO value is less than 0.5%. Qualified, cool and discharge, keep away from light for later use. 19% of the NCO groups of the obtained fully blocked isocyanate were blocked by polyether N-220, and the solid content was 65.1%.

Example Embodiment

[0023] Example 3 Preparation of Pigment Slurry A

[0024] 1. The formula is shown in Table 3

[0025]

[0026] 2. Craft

[0027] In a clean cylinder, add the saturated polyester resin, pigment, dispersant and solvent in the formula in sequence, and use a high-speed disperser for high-speed dispersion, while controlling the temperature below 40°C. The fineness was measured after 1 hour, and the material was discharged when it was less than 10 μm, and stored in the dark for later use. The solid content of the pigment paste was 75.9%, and the pigment-base ratio was 3:1.

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Abstract

The finish for pre-coating coiled material consists of saturated polyester resin with linear and/or branched chain structure and acid value less than 5 mg KOH/g 10-50 wt%, amino resin 1-30 wt%, polyisocyanate closed with at least two kinds of closing agent with active hydrogen 1-30 wt%, pigment slurry 40-87 wt% and assistant 0.1-5.0 wt%. It is homogeneous white ropy liquid mixture, and has coating-4 viscosity at 23 deg.c 20-200 sec and solid content 40-80 wt%. It is coated and stoved at 200-260 deg.c for 20-90 sec to form dry film of 8-35 micron thickness. The film can fulfill the requirement for pre-coating coiled material.

Description

technical field [0001] The invention relates to a topcoat for precoated coils. Background technique [0002] Since the pre-coated coil entered industrialization in the 1940s, its usage has continued to expand. Pre-coated coil coatings have also been continuously developed with the large number of applications of pre-coated coils, and their varieties have developed from a single variety to dozens of varieties at present. In different fields of use, the performance requirements for precoated coil coatings are also different. At present, the types of coatings used for pre-coated coil topcoats are mainly polyester coatings, and there are many varieties according to different application fields. European patent EP686678 discloses a precoated coil topcoat prepared with polyester resin, amino resin or urea-formaldehyde resin, catalyst, pigment, wax, polysiloxane, polyacrylic acid, etc., although a thickness of 40-55 μm can be obtained However, the curing temperature of this topc...

Claims

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Application Information

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IPC IPC(8): C09D167/00
Inventor 胡靖暐罗志刚李大鸣甘崇宁杨春娣
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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