Research and development and discussion of water-based engineering mechanical coating formulations

China Paint Online News News
Hu Xiaofeng, Qiu Xuxuan, Yan Hao'an, Liu Baofeng, Liu Gaofeng
(Foshan Gaoming Tongde Chemical Co., Ltd., Foshan, Guangdong)
Abstract: With the increasing state supervision of environmental protection, the hydration of construction machinery coatings is also imminent, this article is mainly from Water-based two-component epoxy resin screening, surface paint water-based hydroxypropyl acrylic resin screening, as well as water-based mechanical coating formulation design to solve the current water-based engineering machinery coating in the actual construction process of several common problems, such as wet and wet coating loss, flow hanging problems, foam problems and so on.
keywords: construction machinery, water-based, wet and wet, bite bottom, hanging limit, bubble limit, salt spray resistance
1 introduction In recent years, China's construction machinery manufacturing industry has been rapid development, because most of the construction machinery products of large size, so the demand for paint, an excavator average paint use reached 50kg. Therefore, the construction machinery paint market prospects are very broad. In order to improve product competitiveness, engineering machinery manufacturers are no longer limited to the internal quality and performance of products, to obtain anti-corrosion performance and good appearance quality coating, while engineering machinery coating is moving towards energy-saving, environment-friendly, low-carbon coating technology application trends, such as water-based coatings, high solids coatings, powder coatings. However, due to the complex structure of construction machinery, powder coatings are difficult to apply at present, so high solids and water-based coatings become the first choice. High solid sub-coats still have a large number of toxic solvents, so the water-based construction machinery coatings, the entire coating industry has great significance. Water-based paint spraying process has been applied in the production of automotive parts coating, and the accumulation of these technologies provides technical guidance for the application of water-based paint coating process in engineering machinery. Of course, water-based coatings also have their own weaknesses, such as: strict pre-treatment requirements for the surface of the work parts, drying process needs to strictly control temperature and humidity, the use of stainless steel equipment, compared with solvent-based coatings project production efficiency is also a clear disadvantage. This paper mainly discusses the application of water-based two-component epoxy primer and water-based two-component polyurethane paint in construction machinery.
1.1 construction machinery coating requirementsThe quality requirements for typical construction machinery coating can be found in Table 1.
table 1. Construction machinery coating film performance requirements
s1 sequenty number test itemtechnical indicators inspection method 1 paint film appearance scale smooth visual 2 total film thickness (primer finish) 80-120 mfilm thickness 3gloss (60 degrees) ≥85 GB/T 9754-2007 4pencil hardness (Mitsubishi) ≥H GB/T 6739-2006 5Adhesion (2mm) 0-1 Class GB/T 9286-19986Water resistance 40 degrees C water 240 hours, no foaming, allowing minor color change, loss of light GB/T 1733-195 7acid resistance (0.1mol/L)paint film is non-foaming, non-wrinkled, allowing for slight loss of light, color change, and then do adhesion 0/1 class GB/T 1763 8alkaline (0.1mol/L)paint film is non-foaming, not wrinkled, allowing slightly de-glossy, Then do adhesion 0/1GB/T 1763 9artificial accelerated aging experimentXenon lamp 2000 hours loss rate ≤30% no significant color change: E≤3.0 GB/T 1865-1997 10salt composite coating requirements 100 0h, fork rust does not exceed 2mm GB 1765 sequenty number sequentical indicators technical indicators inspection method 1 paint film appearance flat smooth visual 2 total film thickness (primer plus finish) 80-120 sm thickener 3 gloss (60 degrees) ≥85 GB/T 9754-2007 4 pencil hardness (Mitsubishi) ≥H GB/T 6739-2006 5 Adhesion (2mm)
Class 0-1 GB/T 9286-1998 6 Water resistance 40 degrees C water 240 hours, paint film non-foaming, allowing minor color change, loss of light GB/T 1733-1985 7 acid resistance (0.1mol/L)

paint film does not bubble, does not wrinkle, allows for slight loss of light, color change, and then do adhesion 0/1 level GB/T 1763 8 alkaline (0.1mol/L) paint film non-foaming, non-wrinkled, allowing for slight loss of light, color change, and then adhesion 0/1 class GB/T 1763 9 artificial accelerated aging experiment xenon lamp 2000 hours loss rate ≤30% No significant color change: E≤ 3.0 GB/T 1865-1997 10 salt-resistant fog composite coating requirements 1000h, fork rust does not exceed 2mm GB 1765 order detection project technical indicators inspection method 1 paint film appearance flee flat smooth visual 2 total film thickness (primer plus paint) 80-120 m film thickness 3 gloss (60 degrees) ≥85 GB/T 9754-2007 ≥ 4 Pencil Hardness (Mitsubishi) ≥H GB/T 6739-2006 5 Adhesion (2mm) 0-1 Class GB/T 9286-1998 6 water resistance 240 hours in 40 degrees C water, paint film non-foaming, allowing minor color change, loss of light GB/T 1733-1985 7 acid resistance (0.1mol/L) paint film non-foaming, non-wrinkle, allowing minor loss of light, color change, Do adhesion 0/1 class GB/T 1763 8 alkaline (0.1mol/L) paint film is non-foaming, not wrinkled, allowing for slight loss of light, color change, Do adhesion 0/1 class GB/T 1763 9 artificial accelerated aging experiment Xenon lamp 2000 hours loss rate ≤30% no significant color change: E≤3.0 GB/T 1865-1997 10 salt-resistant composite coating requires 1000h, fork rust does not exceed 2mm GB 1765 sequentium no. sequentiumseinding items technical indicators inspection method 1 paint film appearance flee smooth Measured 2 total film thickness (primer plus paint) 80-120
μ
m film thicknesser 3 gloss (
60
degrees) ≥
85 GB / T 9754-2007 4 Pencil Hardness (Mitsubishi) ≥
H GB/T 6739-2006 5 Adhesion (
2mm
) 0-1
Class GB/T 9286-199 8 6 water resistance 40
degrees C water
240
hours, paint film non-foaming, allowing minor color change, loss of light GB/T 1733-1985 7 acid resistance (
0.1mol/L
) Paint film is non-foaming, non-wrinkled
,
allows for slight loss of light, color change
,
and then do adhesion
0/1
grade GB/T 1763 8 alkaline (
0.1mol/L
) film does not foam, no wrinkle
,
allows minor loss of light,

,
and adhesion
0/1
level GB/T 1763 9 artificial accelerated aging experiment xenon lamp
2000
hours loss rate ≤
30%
no significant
:

E
≤
3.0 。 GB/T 1865-1997 10 Sald-resistant composite coating requirements
1000h
, fork rust does not exceed
2mm GB 1765
water-based engineering machinery coating requirements are basically to copy solvent-type paint film performance requirements, but the construction process can not be fully in accordance with the existing solvent-based construction methods. For example, the primer construction after the need to bake water removal process, and then paint, otherwise it is easy to appear paint bite the background, resulting in paint loss, paint spray environment is best to control a certain degree of temperature and humidity, to prevent construction hanging and paint film burst. But these temperature and humidity control and baking conditions can be provided in some large construction machinery preparation plants, but not for some small construction machinery preparation manufacturers