A kind of high whiteness and high coating rate coil white finish paint and its preparation method and application

A coating rate, high whiteness technology, applied in coatings, polyester coatings, etc., can solve the problems that affect the physical and chemical properties of coatings and weather resistance, whiteness and hiding power, and cannot satisfy high-end customers. Outdoor chalking resistance, easy application, high whiteness effect

Active Publication Date: 2022-02-15
NIPPON PAINT IND COATINGS SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] For white topcoats, the usual way to increase the spread rate is to use high-solid resins and light fillers to replace part of titanium dioxide, so as to reduce the specific gravity of the dry film of the paint while ensuring the hiding power, but in this case the whiteness of the paint The degree and hiding power will be affected, so it is contradictory to increase the spreading rate and increase the whiteness. In addition, it may also affect the physical and chemical properties and weather resistance of the coating.
Conventional white topcoats have high whiteness under full light conditions, usually L value > 91, but with the addition of matting agents, the whiteness also decreases, when the gloss (60°) drops to 20°- Between 30°, the whiteness will also decrease. Usually the L value of the white paste is between 90-93. If the whiteness of the white topcoat is not high, many colors that require low gloss and high whiteness will be fine when toning. It cannot be prepared at all, so the application of the product is limited, and the needs of high-end customers cannot be met

Method used

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  • A kind of high whiteness and high coating rate coil white finish paint and its preparation method and application
  • A kind of high whiteness and high coating rate coil white finish paint and its preparation method and application
  • A kind of high whiteness and high coating rate coil white finish paint and its preparation method and application

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preparation example Construction

[0056] In a preferred example, in the preparation method of the saturated polyester resin A, between step 1) and step 2), it also includes adding 1-8 parts by weight of xylene into the reaction kettle until the material acid Value<10KOHmg / g is the step of reaction end point.

[0057] In a preferred example, the saturated polyester resin A has a number average molecular weight of 1500-2500, a PDI of 2-2.6, a hydroxyl value of 110-140 mgKOH / g, a mass solid content of 75-85%, and a viscosity of X- Z2. Exemplarily, the number average molecular weight of the saturated polyester resin A includes but is not limited to 1500-2000, 1900-2500, 1900-2500, 1900, 2000 and the like. Exemplarily, the hydroxyl value of the saturated polyester resin A is 110-130 mgKOH / g, 110-120 mgKOH / g, 120-130 mgKOH / g, 110 mgKOH / g, 130 mgKOH / g, etc.

[0058] In yet another preferred example, the flexible saturated polyester resin B has a number average molecular weight of 2500-3500, a PDI of 3-3.5, a hydrox...

Embodiment 1

[0089] High whiteness and high coating rate coil white topcoat, its raw materials are shown in Table 1 below.

[0090]The preparation method of high whiteness and high coating rate coil white topcoat comprises the following steps:

[0091] (1) Premixing: Add part A in Table 1 to the container of the high-speed mixer in turn, and start stirring;

[0092] (2) Wetting and dispersing: Add B under stirring conditions, and after the titanium dioxide is wetted, add glass beads, and it is difficult to control the fineness test time according to the titanium dioxide dispersion, control the fineness at 15-20um, and stop the dispersion.

[0093] (3) Thinning: After filtering the glass beads in the sand grinding slurry, calculate the yield, add C while stirring in a new container, and continue to stir evenly.

[0094] (4) Preparation of high-gloss paint: use mixed solvent a or mixed solvent b to dilute directly, viscosity 110-120s (coat 4 cups / 25°C), and then get high-gloss white finish ...

Embodiment 2-8

[0101] High whiteness and high coating rate coil white topcoat, its raw materials are shown in Table 1 below. Its preparation method is with embodiment 1.

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Abstract

The invention discloses a high-whiteness and high-coating rate coil white finish paint, which comprises the following raw materials in parts by weight: 30-41 parts of saturated polyester resin; 3-20 parts of flexible saturated polyester resin; 3-7 parts of amino resin 0.1-0.5 parts of catalyst; 32-40 parts of titanium dioxide; 8-15 parts of solvent; 0.5-13 parts of additives. This white topcoat has high whiteness and high coverage, suitable for use as a coil topcoat. The invention also discloses the preparation method and application of the top paint.

Description

technical field [0001] The invention relates to the technical field of coil coatings. More specifically, it relates to a high-whiteness and high-coating-rate coil white topcoat and its preparation method and application. Background technique [0002] The earliest coil coatings in the world appeared in the 1930s, and my country began to establish coil coating production after the 1980s. Pre-coated coil coating is a fast automatic assembly line production method, which is coated on continuous metal sheets (the sheets are derusted, degreased, cleaned, passivated and surface treated before coating), and formed after high temperature curing. Film, a special coating that achieves certain mechanical and physical properties. The pre-coated coil products after coating are widely used in various fields such as construction, home appliances, containers, automobile manufacturing, and cooking utensils. After the user purchases the pre-coated coil product, that is, the color-coated ste...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/02C09D167/00C09D161/20C09D7/65C09D7/61C09D7/63
CPCC09D167/02C09D7/65C09D7/61C09D7/63C08K2003/2241C08L2205/03C08L2205/02C08L2201/08C08L67/00C08L61/20C08K13/02C08K3/22
Inventor 唐铭徽陈薇宫原贵宏沈雪峰
Owner NIPPON PAINT IND COATINGS SHANGHAI
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