Development of Wear-resistant Coatings Based on Silicone Modified Polyester Resin

Silicone modified polyester resin wear-resistant coating development
Zhang Quanwei, Zhang Jianfei, Li Bin, Wang Jinzhong, Ma Yanqing
(Zhongyu North Coatings Industry Research and Design Institute Co., Ltd., Lanzhou 730020)
summary: silicone modified polyester resin as a wear-resistant resin, the resin value, silicone content, molecular structure on the performance of the coating film and coating storage stability has a significant impact. To wear-resistant resin as the base material, the choice of silicon carbide as a wear-resistant filler, the choice of molybdenum dioxide as a lubrication filler, thus preparing a good mechanical properties and good corrosion resistance of wear-resistant coatings.
key words: silicone modified polyester resin; wear-resistant fillers; lubricated fillers; anti-corrosion properties
chinese
.
0 Introduction
With the progress of science and technology, the working environment of various mechanical facilities and their components has become increasingly severe, working not only in complex environments, but also in the impelers and ships of satellites, high-speed trains, spaceships, engines and turbines. The ship's propellers, the ship's deck and the blades of the turbine generator, road signs
painting
, the floor of the building, etc., are often affected by the air flow, sand and water erosion, impact, friction and other forces. After use in this environment for a period of time, the substrate surface will appear a certain degree of damage or wear, which will affect the safety and service life of the equipment. By applying wear-resistant coating on the surface of mechanical equipment, it is a kind of surface reinforcement technology with great application prospect and development prospect. The surface of the material after the wear-resistant coating, not only can prevent wear parts and other parts, extend the service life of the equipment, but also can also play a protective role in the substation material corrosion protection. Because the technology is simple, fast, low cost and suitable for field operation, it has become one of the main means to improve the wear resistance of machinery and equipment.
we have independently designed and developed a new generation of wear-resistant coatings according to market demand. The wear-resistant coating developed in this paper has excellent wear resistance and good corrosion resistance. After the coating of the coating, industrial equipment can greatly improve the wear resistance of the metal contact surface, protect the key parts of the machinery and equipment at the same time improve the anti-corrosion performance of the equipment, improve the safety of the mechanical equipment, extend the actual service life of the mechanical equipment.
1 Test part
1.1 main raw materials
1
,
6-hexiol
, trihydroxyethylene isocyanate, cyclohexane methamphetamine, trihydroxymethyl propane,
1
,
4-cyclohexane methanol
, silicone resin,
N-3390
,
SiC
, graphite, molybdenum disulfide, additives, catalysts, UV absorbers, solvents, all of which are industrial raw materials.
1.2 Development of wear-resistant resin
We first use self-synthetic high hydroxy polyester resin as the main resin, it reacts with isocyanate resin to produce polyurethane, less by-products, so the volume shrinkage is small, curing produces less internal stress, and in the coating film to provide wear resistance and toughness. In order to apply the film has better hardness and wear resistance, we choose a high cross-linked silicone resin to co-poly-modified polyester resin. Since the heat resistance temperature of polyester resin is
155 degrees C, while the heat resistance temperature of silicone resin is 300 degrees C, the heat resistance temperature of silicone resin
co-polysonated polyester resin is
200
to
250 degrees C, so the addition of silicone resin, but also can improve the
coating resistance, but also improve the film water resistance, weather resistance and adhesion with the substrate. The resin system provides excellent wear resistance and other comprehensive properties in wear-resistant coatings.
the synthetic polyester resin, the acids and alcohols of the adipose and cycloester groups are used, so that the coating film can obtain better weather resistance. Trihydroxyethyl isocyanate is introduced into the resin, which improves the wear resistance and hardness of the coating film. The hydrolytic stability of these single-system prepared polyester resin hydroxy value (250±10) mgKOH/g, the resin and HDI trimer curing can obtain a good water resistance coating film, in order to make this high cross-link density coating film With good impact resistance and flexibility, in the synthesis of resin using a line structure 1,6-hethyl glycol, and through a step-by-step synthesis process, so that each polyester resin molecule contains 1,6-hethyl glycol unit structure, coating curing to ensure the toughness of the coating film.
1.3 Choice of wear-resistant fillers and lubricated fillers
Wear-resistant fillers provide a hard and heat-resistant effect because the wear coating increases the temperature at the point of contact due to friction when it is relatively moving in contact with the surface of the equipment. High temperatures can affect the Vanderwal force between molecules, resulting in a decrease in intermodal cohesion energy, a decrease in the shear strength of surface materials, and increased coating wear, so we choose high hardness, high strength, heat resistance fillers
SiC, alumina as wear-resistant fillers. The lubrication fillers mainly choose radon
and graphite. The molybdenum dioxide molecule is a hexagonal layered structure in which the molecular arrangement is the middle molybdenum atom and the outer layersulfur atom. Microscopically, due to the weak binding capacity of
S atoms
between molecular layers, the lubrication conditions that are very easy to move between molecular layers are formed, which makes molybdenum diulpheride play an excellent lubrication performance in the coating film, so that the two contact surfaces meet good lubrication requirements and reduce wear and friction.
1.4 Preparation of wear-resistant coatings
First of all, the development of wear-resistant resin, this paper selected silicone modified high hydroxy polyester resin and faster reaction speed isocyanate resin
HDI trimer N-3390 for the coating film resin, the film resin hardness and flexibility, in the wear-resistant coating plays a key role. In addition, the selection of suitable wear-resistant fillers and lubrication fillers in wear-resistant coatings is extremely important, this paper selected SiC as a wear-resistant filler to provide anti-wear effect, the use of molybdenum dioxide, graphite, etc. as lubrication fillers
to reduce friction effect. Finally, we choose the right additives and solvents, additives to make the coating surface smooth and flat, color is the same, wear resistance is more prominent, solvents can make resins, fillers and additives excellent solubility and wetting.
2Results and discussion
2.1 Silicone modified polyester resin research
Silicone modified polyester resin, not only can improve the hardness of the coating film, but also improve the adhesion of the coating film on the substrate, but also improve the coating film heat resistance and media resistance. Polyester resin modified with silicone resin also improves water resistance, because the modified polyester resin surface free energy with the increase of silicone content and reduce, a small amount of silicone can greatly reduce the surface free energy of polyester resin, and reduce the surface freedom can be conducive to the film water resistance improvement. Table
1
effects of different additions of silicone resins in polyester polyols on wear resistance and other properties.
table
1 silicone resin
different additions of the impact on performance
resin
ratio
brain resistance
mechanical properties
polyester
1.5
50 cm positive and reverse Over, flexible 1 mm, adhesion level 1
polyester: silicone resin
3:1
1.1
50 cm forward and reverse, flexibility 1 mm, adhesion level 1
polyester : Silicone resin
2:1
0.9
50 cm forward and reverse, flexibility 1 mm, adhesion level 1
polyester: silicone resin
1:1
2.5
50 cm is rushing back but, flexible 1 mm, adhesion level 2
through the above test data can be seen when polyester polyols and silicone resins in accordance with
2
:
1 co-ed, excellent wear resistance, The wear data is 0.9 mg
and the mechanical properties are good.
2.2 Addition of wear and lubrication fillers and the effect of the wear resistance of filler re-pairing
Since traditional wear-resistant coatings do not take into account the heat generated by the wear-resistant process, the addition of some wear-resistant heat-resistant fillers
SiC in this paper can improve both the heat resistance of the
coating and the wear resistance. Table
2
is the effect of some wear and lubrication filler additions on wear resistance, and Table
3
is the effect of re-pairing wear resistance for wear and lubrication fillers.
Table
2 Effects of different fillers on wear resistance and other properties at different pigment ratios
Filler
Pigment ratio
Wear resistance
Mechanical properties
Silicon carbide 1.0 to 1.0
0 .8
50 cm is rushing back but, flexibility 2 mm, adhesion level 2
0.5:1.0
0.4
50 cm forward and reverse, flexibility 1 mm, adhesion level 1

0.3:1.0
0.3
50 cm forward and reverse, flexible 1 mm, adhesion level 1
dysulphate
1.5:1.0
15.9
50 cm forward and reverse, flexibility 1 mm, adhesion level 2
0.8:1.0
9.4
50 cm forward and reverse, flexibility 1 mm, adhesion level 1
0.4:1.0
4.3
50 cm forward and reverse, flexible 1 mm, adhesion level 1through the above test data can choose silicon carbide in the Yanji ratio of
0.5
:
1.0
, molybdenum desulfurization has excellent wear resistance at
0.4
:
1.0
in Yanji ratio, and good drying speed and mechanical performance.
Table
3 Effects of wear and lubrication fillers on re-pairing wear resistance
Filler
Filler ratio
pigment ratio
brand resistance
Mechanical properties
Silicon carbide: molybdenum dioxide

1.0:0.4
1.4:1.0
8.8
50 cm is rushing past the counter-punch, flexibility 1 mm, adhesion level 2
5: 2
0.7:1.0
1.6
50 cm forward and reverse, flexible 1 mm, adhesion level 1 through the above test on the re-matching of wear and lubrication fillers we finally chose Silicon carbide, molybdenum desulfurization filler ratio of
5
:
2 and pigment ratio of 0.7
:
1.0
when the comprehensive wear, dry and mechanical performance is optimal. Silicon carbide plays a wear-resistant role, while molybdenum dithione acts as lubrication in the coating film.
2.3 anti-corrosion properties of wear-resistant coatings
wear-resistant coatings have excellent resistance to wet heat, salt spray and aging. Model coated with wear-resistant paint in the wet hot box placed
30 d
coating surface non-foaming, in the neutral salt mist tank placed
7 days
coating surface non-foaming, coating no change, model anti-UV aging
30 d
coating non-powdering, preservation rate
≥90%,
E
≤3). It is stated that the coating not only has excellent wear resistance but also good corrosion resistance, which can completely extend the service life of substrates and machinery and equipment.
2.4 The choice of coating additives and the impact on the quality of the coating
coating resin, solvent, pigment system is
determined, in order to improve the performance of the coating, in the coating selected suitable additives, dispersants for pigment dispersion, and can reduce the viscosity of the coating
; BYK-410 as a sinking agent and anti-flow hanging aid, this modified type of aid can be thick coated during the construction of the coating, without affecting the
gloss of the coating film;
BYK-378 as a leveling agent, this leveling agent can significantly improve the surface smoothness of the coating film, improve the coating's stain resistance and wear resistance. In order to ensure better weather resistance, UV absorbers are added to the paint.
3
Conclusion
1)
1
adopted
,
6-hexyl glycol
, trihydroxyethyl isocyanate, cyclohexane diethylene,
1
,
4-cyclohexane methanol synthesis high hydroxy-tough polyester resin
, and then the polyester resin modified with silicone resin. The film-forming resin is flexible and hard, has excellent wear resistance, and plays a key role in wear-resistant coatings.
2)
select suitable wear-resistant fillers and lubrication fillers, where the wear-resistant fillers choose
SiC, can improve the anti-wear effect of
coating, the selection of dithione, graphite and other lubrication fillers to reduce friction. Where the ratio of wear resistance to lubrication fillers is silicon carbide: