Research and development of waterborne acrylic dipping paint for the door-Iota

Products

News

Office Address:	Sunmoon Science Park, 985 Xingzhong Road, High-Tech Zone, Bengbu, China
Factory Address:	Mohekou Industrial Park, Huaishang District, Bengbu, Anhui, China
Contact:	Nathan Zhang
Phone:	0086-552-19805521900
FAX:	0086-552-3822922
Mobile:	19805521900/18119733779
WebSite:	www.siliconeoil.cn www.siliconeoil.net
Email:
QQ:	729118868

News > Dynamic industry > Research and development of waterborne acrylic dipping paint for the door

Research and development of waterborne acrylic dipping paint for the door

Keywords: water paint; acrylic emulsion; dip coating; protective dipping paint

0 foreword

Dip coating method is to use suspension hook the workpiece immersion stay 30sin Sheng paint groove,, will diffuse through the coating of the workpiece is taken out, let the excess paint from falling into the groove of the coating method ofcoating. Dip coating method is labor saving and material saving, high production efficiency, coating equipment and simple operation, can adopt mechanization orautomation of continuous production, mass production is most suitable for single species, mainly is suitable for the hardware parts, steel pipe rack and the complex structure of the equipment or electrical insulating material coating.According to the workpiece, the corrosion degree of oil, pretreatment is divided into different process. No rust workpiece: pre degreasing degreasing, water washing, surface adjusting - phosphating - water washing - drying; general oil,rust, oxide skin mixed workpiece: degreasing derusting "two in one" - water washing neutralization - Watch - phosphate - water washing - drying; heavy greasy dirt, rust, oxide skin type work: pre degreasing - water washing -degreasing derusting "two in one" - water washing neutralization - Watch -phosphate - water washing and drying. Water dipping paint is mainly used forcoating to the engineering track, telescopic piece sofa, hub, frame, scaffold, thecoating way to dip coating, coating high stability requirements, dip coating, the coating is generally 15 to 25 mu m, requires high anticorrosion performance. The coating also has strict requirements in environmental protection, requirements do not contain phthalic acid esters, two B two glycol ether, halogenated hydrocarbons, benzene, toluene, xylene, ethyl benzene and other harmful substances, does not contain toxic heavy metals lead, cadmium, chromium,mercury. Now on the market of dipping paint anti-corrosion, poor water resistance, salt fog resistance generally only 24h, bath stability is bad, not suitable for dip coating.

1 - test part

The 1.1 main raw materials

Aqueous acrylic emulsion, pigment, wetting agents, dispersing agent, defoaming agent, multifunctional additives, carbon black, iron oxide black, import; anti rustagent, thickening agent, made in china.

1.2 test instrument

TO6001 electronic balance, Tianjin Balance Instrument Co. Ltd; JJ-1 force electric blender, QSM- II, QHQ type sand mill film pencil hardness scratchhardness tester, QTX type paint film flexibility tester, QFZ- type II film adhesiontest machine, Tianjin material testing machine factory; YWX/Q-150 type salt fog test box, Wuxi South of Jiangsu Experimental Equipment Co., ltd..

1.3 aqueous acrylic protective varnish preparation

The basic formula of waterborne acrylic dipping paint the door

Waterborne acrylic protective varnish preparation: first the raw material 1 is added to the container, the high speed dispersion machine speed to 300r/min,under the condition of stirring the order by adding 2 ~ 7 of raw material, the high speed dispersion machine speed increased to 500r/min, stirring 30min, mixed evenly with no lump, sand mill for raw material mixture is 1 ~ 7 grinding fineness is less than or equal to 30 mu m, made of pigment paste. Stirring will be 8 ~ 12 raw material through mixing, preparing varnish added pigment paste prepared,stirring evenly, with 13 viscosity adjusted to 45 ~ 55s (coating 4 cup, 25 DEG C),the final filter packing. Cast groove, diluted with water, dip coating viscosity control in 23 ~ 26S (coating 4 cup, 25 C).

1.4 performance test of [1]

The coating according to the provisions of the system board, and with the marketthe paint dipping test function at the same time, the results in table 2.

The test results of film performance

Figure 1 is a water-based acrylic protective paint dipping resistant test results to salt spray on the sofa telescopic piece.

The salt fog test images

Figure 1 from left to right salt water fog results on the market 48h impregnating,the experimental preparation of dipping paint 48h, after 96h. Fig. 1 comparison,water-based acrylic protective the test preparation for impregnating salt fogperformance is excellent. Table 3 test results for two kinds of paint dipping bath solution stability.

The test results of waterborne acrylic dipping paint the stability of bath door

From table 2, table 3 and figure 1 show, water-based acrylic protective the testpreparation for impregnating water resistance, salt fog resistance and excellent storage stability, exceeded the performance market water-based varnish, and through user feedback, fully meet the requirements of customers.

2 results and discussion

The 2.1 film forming material selection

The stability of bath solution is dipping paint priority, so in the film when the choice is made, is studied theoretically and experimentally in detail: water soluble alkyd resin paint as alkyd resin easy degradation under alkaline conditions,resulting in loss of dry, short storage and other issues, not suitable for theleaching of water-soluble acrylic amino paint; high temperature baking paintneeds more than 120 DEG C, its application is limited; and the aqueous acrylic emulsion has good storage stability, long shelf life, wide range of application, can be self can also dry baking, and through a lot of experiments, the acrylic emulsion were systematically screened from the varnish to paint, the final determination of the film material of the system.

The choice of 2.2 anti rust pigment

Most of the traditional antirust pigments containing lead and chromium, chromium and other heavy metals lead compounds on the human body, cause serious environmental pollution, therefore, many countries in the world to launch anti rust pigment elimination or comprehensive regulations to ban the use of these lead orchromium. However, corrosion resistance of zinc phosphate is far lower than thezinc chromate or red lead, especially in water paint, even excessive joinperformance is also very difficult to achieve the requirements, but also to avoidflash rust phenomenon. Aluminum tripolyphosphate although good antirusting action, but poor storage stability in water borne coatings. This experimentselected phosphomolybdate antirust pigment, phosphorus molybdate compound itself is slightly soluble in water, and phosphorus molybdate ions with anti in aqueous systems