CN113770927A

CN113770927A - Long-life stamping grinding belt and preparation method thereof

Info

Publication number: CN113770927A
Application number: CN202111111939.1A
Authority: CN
Inventors: 张瑞敏; 董景涛; 何晓艳; 齐朝辉
Original assignee: Beijing Liyan Technology Co Ltd
Current assignee: Beijing Liyan Technology Co Ltd
Priority date: 2021-09-18
Filing date: 2021-09-18
Publication date: 2021-12-10

Abstract

The invention discloses a preparation method of a long-life stamping grinding belt, which comprises the following steps: (1) mixing an abrasive with bisphenol A phenolic resin and polyvinyl butyral resin to obtain slurry; (2) placing the slurry into a die printing roller, and transferring the slurry onto a cloth base substrate to obtain the cloth base substrate coated with the abrasive; (3) and (3) drying the cloth base material coated with the abrasive material in the step (2) to obtain a semi-finished product, and then cutting and forming to obtain the die-stamping grinding belt. The grinding belt has the advantages of consistent grinding effect, good chip removal effect and long service life, and can be applied to metal or resin composite materials.

Description

Long-life stamping grinding belt and preparation method thereof

Technical Field

The invention belongs to the field of grinding materials, and particularly relates to a long-life stamping grinding belt and a preparation method thereof.

Background

Abrasives are tools used for grinding, lapping and polishing. Most of the grinding tools are artificial grinding tools made of grinding materials and bonding agents, and also natural grinding tools directly processed by natural ore rocks are used. Grinding tools are widely used in the machinery and other metal processing industries, but also in grain processing, paper industry and the processing of non-metallic materials such as ceramics, glass, stone, plastics, rubber, wood, etc.

Abrasive articles are generally formed by a combination of abrasive particles, pores, and a binder. The binding agent is an indispensable raw material for manufacturing the grinding tool, and has the function of consolidating the abrasive grains to form the grinding tool with a certain shape and certain strength. Abrasive tools are generally classified into three broad categories: resin binder, ceramic binder and metal binder.

The resin binder used in the invention is a mixture of phenolic resin and polyvinyl butyral resin. The phenolic resin has high wear resistance and high heat resistance, and can be compatible with various organic and inorganic fillers; however, phenol resins are brittle and have low mechanical strength. Polyvinyl butyral has good toughness and good low-temperature impact resistance, and acetal degree of acetal resin used in industry is about 70%, so that the molecular structure of polyvinyl butyral contains acetal groups, and also contains partial hydroxyl groups and a small amount of acetyl groups, so that polyvinyl butyral has good adhesive performance to materials such as metal, wood, ceramics, plastics, fibers and the like.

Disclosure of Invention

The invention provides a long-life stamping grinding belt and a preparation method thereof.

The technical scheme of the invention is as follows:

a method for preparing a long-life stamping grinding belt comprises the following steps:

(1) mixing an abrasive with phenolic resin and polyvinyl butyral resin to obtain slurry;

(2) placing the slurry into a die printing roller, and transferring the slurry onto a cloth base substrate to obtain the cloth base substrate coated with the abrasive;

(3) and (4) drying the cloth base material coated with the abrasive material in the step (3) to obtain a semi-finished product, and then cutting and forming to obtain the die-stamping grinding belt.

The invention mixes the phenolic resin and the polyvinyl butyral resin, the hydroxy (-OH) exists in the butyral resin, and can be mixed with the hydroxymethyl (-CH) in the phenolic resin₂-OH) to form a three-dimensional cross-linked network structure, so that the brittleness of the phenolic resin is improved, and the product performance is improved, wherein the product is shown as a formula 1:

preferably, in the step (1), the abrasive is alumina or silicon carbide;

the grain diameter is 30-300 μm.

Preferably, in the step (1), the phenolic resin is PF 2509.

Preferably, in step (1), the polyvinyl butyral resin is B16H and has a viscosity of 20s, and if the viscosity of the selected polyvinyl acetal resin is too high (more than 20s), PVB has difficulty in solubility, the viscosity causes poor compatibility with phenolic resin and influences the stability of a slurry system, and PVB has high viscosity and high molecular weight, has good toughness and reduces grinding force and influences the performance of a product.

Preferably, in the step (1), the grinding material is alumina or silicon carbide micropowder of gold epoch.

Preferably, in the step (1), the mass ratio of the abrasive to the phenolic resin to the polyvinyl butyral resin is 6: 3: 1-7: 2: 1.

preferably, in the step (3), drying is carried out in a drying channel, the drying channel is divided into three areas, wherein the temperature of the first area of the drying channel is 85-95 ℃, the time is about 3-5min, so that the coating is dried on the surface, the time is too short, the surface drying is not measured, the time is too long, the reaction time of the coating in a low-temperature area is too long, and the adhesion force between the coating and the base material is poor; the temperature of the second zone is 120-140 ℃, the time is 8-10min, so that the adhesive in the coating is further reacted, the reaction temperature of the phenolic resin is generally above 120 ℃, the temperature is too high, the deformation of the base material is easily caused, and if the time is too long, the brittleness and the service life of the coating are large; and the temperature of the three zones is 85-95 ℃, and the time is 8-10min, so that the coating is further aged.

Compared with the prior art, the invention has the beneficial effects that:

(1) the abrasive belt with the distributed multi-layer abrasives is obtained by adopting an alumina or silicon carbide abrasive and taking a medium-soft cloth substrate as a substrate and coating pre-dispersed slurry on the cotton-polyester blended cloth substrate through template printing.

(2) The invention adopts specific resin, and utilizes the reaction between the resins to form a three-dimensional cross-linked network structure, thereby improving the performance of the product.

Detailed Description

Example 1

B16H (available from kuraray) was formulated with alcohol at 10% concentration, 100g PF2509 (available from santa yuba) and 500g B16H (10%) were stirred at 300rpm for 10min at room temperature; then 278g of 30-micron silicon carbide micro powder (GC400, purchased from gold epoch abrasive materials Co., Ltd.) is added, the mixture is stirred for 30min at the speed of 800rpm to obtain slurry, the slurry is placed into a die printing roller under the condition of room temperature, the slurry is transferred onto a cloth base substrate at the speed of 10m/min, and the cloth base substrate passes through a three-area drying channel, wherein the temperature of the first area of the drying channel is 85-95 ℃, and the time is 5 min; the temperature of the second zone is 120-130 ℃, and the time is 8 min; and (3) further aging the coating at the temperature of 85-95 ℃ for 10min to obtain a product, testing the product performance, and polishing the titanium alloy sheet with the thickness of 40mm x 70mm to obtain a result shown in Table 2.

Comparative example 1

The procedure was substantially the same as in example 1, except that 200g of B16H was used and 223g of GC400 was used, and the results were shown in tables 1 and 2.

Comparative example 2

The procedure was substantially the same as in example 1, except that B16H was used in an amount of 500g and GC400 was used in an amount of 450 g, and the results were as shown in tables 1 and 2.

Table 1 experimental conditions of example 1, comparative examples 1 and 2

Name (R)	Example 1(g)	COMPARATIVE EXAMPLE 1(g)	COMPARATIVE EXAMPLE 2(g)	Influencing factor
					PF2509	100	100	100	**
B16H(10％)	500	200	500	*
					GC400	278	223	450

Table 2 experimental results of example 1, comparative examples 1 and 2

Results of the experiment	Example 1	Comparative example 1	Comparative example 2
				Amount of removal	40 silk	41	40
Life span	30 pieces	10 pieces	20
				Roughness of	0.5um	0.8um	0.7um

As can be seen from the results in tables 1 and 2, the mass ratio of PF2509 to B16H is greater than the product, and the mass ratio is greater than 3: 1, the product has too large brittleness, short service life and large roughness; if the powder content exceeds 70%, the product properties are adversely affected.

Comparative example 3

The procedure was substantially the same as in example 1, except that B16H was replaced with B30H, and the reaction conditions and results are shown in tables 3 and 4.

Table 3 reaction conditions of example 1 and comparative example 3

Name (R)	Example 1(g)	COMPARATIVE EXAMPLE 3(g)
			PF2509	100	100
B16H(10％)	500	0
			B30H(10％)	0	500
GC400	278	278

Note: B20H viscosity 35-65 s.

Table 4 experimental results of example 1 and comparative example 3

Results of the experiment	Example 1	Comparative example 3
			Amount of removal	40 silk	25 filament
Life span	30 pieces	10 pieces
			Roughness of	0.5um	0.6um

As can be seen from the results in tables 3 and 4, PVB has a high viscosity, a high molecular weight and a high toughness, resulting in a reduced grinding force and a short life of the product.

Claims

1. A preparation method of a long-life stamping grinding belt is characterized by comprising the following steps:

(1) mixing an abrasive with bisphenol A phenolic resin and polyvinyl butyral resin to obtain slurry;

(3) and (3) drying the cloth base material coated with the abrasive material in the step (2) to obtain a semi-finished product, and then cutting and forming to obtain the die-stamping grinding belt.

2. The method for preparing a long life impression abrasive tape according to claim 1, wherein in the step (1), the abrasive is alumina or silicon carbide;

the particle size is 30 to 300 μm.

3. The method for preparing a long life belt for stamping and grinding as claimed in claim 1, wherein in step (1), the bisphenol a phenolic resin is PF2509 resin.

4. The method for preparing the long-life stamping grinding belt as claimed in claim 1, wherein in step (1), the polyvinyl butyral resin is B16H resin with viscosity of 15-25 s.

5. The method for preparing the long-life stamping grinding belt as claimed in claim 1, wherein in the step (1), the mass ratio of the grinding material to the bisphenol A phenolic resin to the polyvinyl butyral resin is 6-7: 2-3: 1.

6. the method for preparing a long-life abrasive belt for stamping according to claim 1, wherein in the step (3), the drying is performed in a drying tunnel divided into three zones, wherein the temperature of the first zone of the drying tunnel is 85 to 95 ℃, the temperature of the second zone is 130 to 140 ℃, and the temperature of the third zone is 85 to 95 ℃.

7. A stamp-grinding tape obtained by the production method according to any one of claims 1 to 6.