CN104708542A - Flexible urea resin grinding apparatus and preparation method thereof - Google Patents

Abstract

The invention discloses a flexible urea-formaldehyde resin abrasive tool, which is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 800-1200 parts of silicon carbide, 50-150 parts of PVA solution with a mass concentration of 2%-8%, 5-20 parts of tributyl phosphate, 5-20 parts of formalin, 0.1-1 part of sodium dodecyl sulfonate, 10-60 parts of curing agent, 20-100 parts of hemihydrate gypsum, 50-200 parts of water . In addition, the invention also discloses a preparation method of the grinding tool. The urea-formaldehyde resin abrasive tool of the present invention has the characteristics of light weight, flexibility, and high grinding efficiency; the abrasive tool has good self-sharpness, and the surface of the processed object is not easy to burn; the abrasive tool has certain elasticity, and is especially suitable for magnesium, aluminum, copper, stainless steel, etc. Fine grinding and polishing of metals, etc.

Description

A kind of flexible urea-formaldehyde resin abrasive tool and preparation method thereof

technical field

The invention belongs to the technical field of abrasive tool preparation, and in particular relates to a flexible urea-formaldehyde resin abrasive tool and a preparation method thereof.

Background technique

As an indispensable and alternative processing tool in the fields of machinery manufacturing and material processing, abrasive tools are known as the "teeth" of industry, and are an important foundation for manufacturing, oil exploration, mining exploration, and material industry. Abrasives mainly include ceramic abrasives and organic abrasives. Organic abrasives mainly use resin and rubber as binders. They are a new type of grinding tool. They have the advantages of simple production process, short cycle and low cost. They are widely used in steel, automobile, aviation, machinery, stone, glass, precious jade Grinding and other aspects, especially in fine grinding and polishing, has outstanding advantages, and has become one of the hot spots in the research and development of the abrasive tool industry in recent years.

The main types of organic abrasives are rubber abrasives and resin abrasives, among which there are many types of resin abrasives. At present, phenolic resin and epoxy resin are relatively mature in production and application, but they have disadvantages such as high curing temperature, long cycle, high cost, and brittle abrasive performance. As a widely used adhesive, urea-formaldehyde resin is currently widely used in wood, paper, fabric and other fields. There are few studies and applications of urea-formaldehyde resin in the abrasive tool industry, and only one article on the application of urea-formaldehyde resin in coated abrasive tools has been reported in the literature. There are many reports on the application of various new resins such as unsaturated polyester resin, polyurethane, polyvinyl alcohol, etc. in abrasive tools, but there is a problem of high cost. At present, most of the fine grinding and polishing abrasive tools used in the market for materials such as stainless steel, magnesium plates, and copper rollers rely on imports, and there is a lack of such products in China.

Contents of the invention

The technical problem to be solved by the present invention is to provide a flexible urea-formaldehyde resin abrasive tool for the above-mentioned deficiencies in the prior art. The abrasive tool has the characteristics of light weight, flexibility, and high grinding efficiency; the abrasive tool has good self-sharpness, and the surface of the processed object is not easy to burn; the abrasive tool has certain elasticity, and is especially suitable for fine grinding of magnesium, aluminum, copper, stainless steel and other metals and polishing.

In order to solve the above-mentioned technical problems, the technical solution adopted in the present invention is: a flexible urea-formaldehyde resin abrasive tool, which is characterized in that it is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 800-1200 parts of silicon carbide, mass concentration 50-150 parts of 2%-8% PVA solution, 5-20 parts of tributyl phosphate, 5-20 parts of formalin, 0.1-1 part of sodium dodecylsulfonate, 10-60 parts of curing agent , 20-100 parts of hemihydrate gypsum, 50-200 parts of water; the curing agent is 16%～20% hydrochloric acid and 18%～22% ammonium chloride solution according to (3～5) mass concentration. :1 volume ratio mixed.

The aforementioned flexible urea-formaldehyde resin abrasive tool is characterized in that it is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 900-1100 parts of silicon carbide, and 80-100 parts of PVA solution with a mass concentration of 2% to 8%. 8-15 parts of tributyl phosphate, 8-15 parts of formalin, 0.2-0.8 parts of sodium dodecyl sulfonate, 20-40 parts of curing agent, 50-80 parts of hemihydrate gypsum, 100- 150 servings.

The above-mentioned flexible urea-formaldehyde resin abrasive tool is characterized in that it is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 1000 parts of silicon carbide, 90 parts of PVA solution with a mass concentration of 5%, and 10 parts of tributyl phosphate 10 parts of formalin, 0.5 parts of sodium dodecyl sulfonate, 30 parts of curing agent, 60 parts of hemihydrate gypsum, and 120 parts of water.

The above-mentioned flexible urea-formaldehyde resin abrasive tool is characterized in that the solid content of the urea-formaldehyde resin glue is 46%-55%.

In addition, the present invention also provides a method for preparing the above-mentioned flexible urea-formaldehyde resin abrasive tool, which is characterized in that it comprises the following steps:

Step 1. Dissolve sodium dodecylsulfonate in water, then add urea-formaldehyde resin glue and PVA solution to the dissolved solution, stir evenly, and then add silicon carbide, hemihydrate gypsum, phosphoric acid to the evenly stirred mixture Tributyl ester and formalin, after stirring for 10min to 30min, add curing agent, continue stirring for 5min to 10min to obtain slurry;

Step 2: inject the slurry described in step 1 into the mold, let stand for 2h-4h at a temperature of 18°C-22°C, and a relative humidity of 50%-70%, and then demould to obtain a semi-finished product;

Step 3. Dry the semi-finished product described in step 2 naturally for 8 hours to 12 hours, then place it in a blast drying oven, and dry it for 10 hours to 15 hours at 40°C to 50°C, and then blow it at 70°C to 80°C. Air drying 10h ~ 15h;

Step 4: Machining the semi-finished product after blast drying in Step 3 to obtain a flexible urea-formaldehyde resin abrasive tool.

Compared with the prior art, the present invention has the following advantages:

1. The urea-formaldehyde resin abrasive tool of the present invention has the characteristics of light weight, flexibility, and high grinding efficiency; the abrasive tool has good self-sharpness, and the surface of the processed object is not easy to burn; the abrasive tool has certain elasticity, and is especially suitable for magnesium, aluminum, copper, Fine grinding and polishing of metals such as stainless steel.

2. The present invention adopts urea-formaldehyde resin glue as the abrasive tool binder, which has good water solubility, easy-to-obtain raw materials, and low cost.

3. The preparation process of the urea-formaldehyde resin abrasive tool of the present invention adopts casting method molding, the process is simple, the equipment investment is small, and the production efficiency is high. Different shapes of molding molds can be selected according to actual product needs, and can be widely popularized and applied.

4. The urea-formaldehyde resin abrasive tool of the present invention adopts low-temperature curing during the preparation, and the curing temperature does not exceed 80°C, which requires low equipment requirements and saves energy and reduces consumption.

The technical solutions of the present invention will be described in further detail below through examples.

Detailed ways

Example 1

The flexible urea-formaldehyde resin abrasive tool of the present embodiment is an outer diameter of 200 mm, a thickness of 50 mm, and a flat grinding wheel abrasive tool of an inner diameter of 50 mm, which is made of the following raw materials: 1000 g of urea-formaldehyde resin glue with a solid content of about 50%, 1000 g of silicon carbide, and a mass concentration of 5% PVA solution 90g, tributyl phosphate 10g, formalin 10g, sodium lauryl sulfonate 0.5g, curing agent 30g, hemihydrate gypsum 60g, water 120g; % hydrochloric acid and ammonium chloride solution with a mass concentration of 20% are mixed according to a volume ratio of 4:1.

The preparation method of the grinding tool of the present embodiment comprises the following steps:

Step 1, 0.5g sodium dodecyl sulfonate is dissolved in 120g water, then add 1000g urea-formaldehyde resin glue and 90g mass concentration to the solution after dissolving is the PVA solution of 5%, stir evenly, then to the PVA solution after stirring Add 1000g of silicon carbide, 60g of gypsum hemihydrate, 10g of tributyl phosphate and 10g of formalin into the mixture, stir for 15 minutes, add 30g of curing agent, and continue stirring for 5 minutes to obtain a slurry;

Step 2: Select a mold according to the size of the parallel grinding wheel abrasive, inject the slurry described in step 1 into the mold, let stand for 3 hours at a temperature of 20°C and a relative humidity of 70%, and then demould to obtain a semi-finished product;

Step 3. Dry the semi-finished product described in step 2 naturally for 12 hours, then place it in a blast drying oven, blow dry it at 40°C for 12 hours, and then dry it at 80°C for 12 hours;

Step 4, machining (machining the outer skin, excircle and chamfering) the semi-finished product after blast drying in the step 3 to obtain a flat emery wheel abrasive tool with an outer diameter of 200mm, a thickness of 50mm, and an inner diameter of 50mm.

The abrasive tool prepared in this example has a density of 1150kg/m ³ , a hardness reaching the national standard (GB/T2484-2006) P grade, and good wear resistance. When the abrasive tool is used for polishing the surface of a brass roller with a diameter of 50mm, the surface accuracy It can reach 0.08 microns, no scratches on the surface, low wear and long service life.

Example 2

The flexible urea-formaldehyde resin abrasive tool of the present embodiment is an outer diameter of 200 mm, a thickness of 50 mm, and a flat emery wheel abrasive tool of an inner diameter of 50 mm, which is made of the following raw materials: 1000 g of urea-formaldehyde resin glue with a solid content of about 46%, 1100 g of silicon carbide, and a mass concentration of 80g of PVA solution of 8%, tributyl phosphate 8g, formalin 15g, sodium lauryl sulfonate 0.2g, curing agent 40g, hemihydrate gypsum 50g, water 100g; Described curing agent is 16 by mass concentration % hydrochloric acid and ammonium chloride solution with a mass concentration of 18% are mixed according to a volume ratio of 5:1.

The preparation method of the grinding tool of the present embodiment comprises the following steps:

Step 1, 0.2g sodium dodecyl sulfonate is dissolved in 100g water, then add 1000g urea-formaldehyde resin glue and 80g mass concentration to the solution after dissolving is the PVA solution of 8%, stir evenly, then to the PVA solution after stirring Add 1100g of silicon carbide, 50g of gypsum hemihydrate, 8g of tributyl phosphate and 15g of formalin into the mixture, stir for 10 minutes, add 40g of curing agent, and continue stirring for 10 minutes to obtain a slurry;

Step 2: Select a mold according to the size of the parallel grinding wheel abrasive, inject the slurry described in step 1 into the mold, let stand for 4 hours at a temperature of 18°C and a relative humidity of 50%, and then demould to obtain a semi-finished product;

Step 3. Dry the semi-finished product described in step 2 naturally for 8 hours, then place it in a blast drying oven, blow dry it at 50°C for 10 hours, and then dry it at 70°C for 15 hours;

Step 4, machining (machining the outer skin, excircle and chamfering) the semi-finished product after blast drying in the step 3 to obtain a flat emery wheel abrasive tool with an outer diameter of 200mm, a thickness of 50mm, and an inner diameter of 50mm.

The abrasive tool prepared in this example has a density of 1250kg/m ³ , a hardness reaching the national standard (GB/T2484-2006) Q grade, and good wear resistance. When the abrasive tool is used for polishing the surface of a copper-plated roller with a diameter of 50 mm, the surface accuracy It can reach 0.06 micron, no scratches on the surface, low wear and long service life.

Example 3

The flexible urea-formaldehyde resin abrasive tool of this embodiment is an outer diameter of 250mm, a thickness of 25mm, and a flat emery wheel abrasive tool of an inner diameter of 32mm, made of the following raw materials: 1000g of urea-formaldehyde resin glue with a solid content of about 55%, 900g of silicon carbide, and a mass concentration of 2% PVA solution 100g, tributyl phosphate 15g, formalin 8g, sodium lauryl sulfonate 0.8g, curing agent 20g, hemihydrate gypsum 80g, water 150g; % hydrochloric acid and ammonium chloride solution with a mass concentration of 22% are mixed according to a volume ratio of 3:1.

The preparation method of the grinding tool of the present embodiment comprises the following steps:

Step 1, 0.8g sodium dodecyl sulfonate is dissolved in 150g water, then add 1000g urea-formaldehyde resin glue and 100g mass concentration to the solution after dissolving is the PVA solution of 2%, stir evenly, then to the PVA solution after stirring Add 900g of silicon carbide, 80g of gypsum hemihydrate, 15g of tributyl phosphate and 8g of formalin into the mixture, add 20g of curing agent after stirring for 30 minutes, and continue stirring for 8 minutes to obtain a slurry;

Step 2: Select a mold according to the size of the parallel grinding wheel abrasive, inject the slurry described in step 1 into the mold, let it stand for 2 hours at a temperature of 22°C and a relative humidity of 60%, and then demould to obtain a semi-finished product;

Step 3. Dry the semi-finished product described in step 2 naturally for 10 hours, then place it in a blast drying oven, blow dry it at 45°C for 15 hours, and then dry it at 75°C for 10 hours;

Step 4, machining (machining the outer skin, excircle and chamfering) the semi-finished product after blast drying in the step 3 to obtain a flat emery wheel abrasive tool with an outer diameter of 200mm, a thickness of 50mm, and an inner diameter of 50mm.

The abrasive tool prepared in this example has a density of 1180kg/m ³ , a hardness reaching the national standard (GB/T2484-2006) P grade, and good wear resistance. When the abrasive tool is used for polishing the surface of a stainless steel roller with a diameter of 60mm, the surface accuracy can be Reaching 0.05 microns, no scratches on the surface, low wear and long service life.

Example 4

The flexible urea-formaldehyde resin abrasive tool of the present embodiment is an outer diameter of 200 mm, a thickness of 50 mm, and a flat emery wheel abrasive tool of an inner diameter of 50 mm, which is made of the following raw materials in parts by weight: 1000 g of urea-formaldehyde resin glue with a solid content of about 52%, 800 g of silicon carbide, Mass concentration is 2% PVA solution 150g, tributyl phosphate 20g, formalin 20g, sodium lauryl sulfonate 1g, curing agent 60g, hemihydrate gypsum 100g, water 200g; It is prepared by mixing 18% hydrochloric acid and 18% ammonium chloride solution in a volume ratio of 3:1.

The preparation method of the grinding tool of the present embodiment comprises the following steps:

Step 1. Dissolve 1g of sodium dodecylsulfonate in 200g of water, then add 1000g of urea-formaldehyde resin glue and 150g of PVA solution with a mass concentration of 2% to the dissolved solution, stir well, and then add to the stirred mixture Add 800g of silicon carbide, 100g of gypsum hemihydrate, 20g of tributyl phosphate and 20g of formalin, stir for 20min, add 60g of curing agent, and continue stirring for 10min to obtain a slurry;

Step 2: Select a mold according to the size of the parallel grinding wheel abrasive, inject the slurry described in step 1 into the mold, let stand for 3 hours at a temperature of 20°C and a relative humidity of 60%, and then demould to obtain a semi-finished product;

Step 3. Dry the semi-finished product described in step 2 naturally for 9 hours, then place it in a blast drying oven, blow dry it at 50°C for 13 hours, and then dry it at 80°C for 12 hours;

Step 4, machining (machining the outer skin, excircle and chamfering) the semi-finished product after blast drying in the step 3 to obtain a flat emery wheel abrasive tool with an outer diameter of 200mm, a thickness of 50mm, and an inner diameter of 50mm.

The density of the abrasive tool prepared in this example is 1120kg/m ³ , the hardness reaches the national standard (GB/T2484-2006) P grade, and the wear resistance is good. When the abrasive tool is used for polishing the surface of a brass roller with a diameter of 60mm, the surface accuracy It can reach 0.05 microns, no scratches on the surface, low wear and long service life.

Example 5

The flexible urea-formaldehyde resin abrasive tool of the present embodiment is an outer diameter of 200 mm, a thickness of 50 mm, and a flat emery wheel abrasive tool of an inner diameter of 50 mm, which is made of the following raw materials in parts by weight: 1000 g of urea-formaldehyde resin glue with a solid content of about 46%, 1200 g of silicon carbide, Mass concentration is 8% PVA solution 50g, tributyl phosphate 5g, formalin 5g, sodium lauryl sulfonate 0.1g, curing agent 10g, hemihydrate gypsum 20g, water 50g; Hydrochloric acid with a concentration of 20% and ammonium chloride solution with a mass concentration of 22% are mixed according to a volume ratio of 4:1.

The preparation method of the grinding tool of the present embodiment comprises the following steps:

Step 1, 0.1g sodium dodecyl sulfonate is dissolved in 50g water, then add 1000g urea-formaldehyde resin glue and 50g mass concentration to the solution after dissolving is the PVA solution of 8%, stir evenly, then to the PVA solution after stirring Add 1200g of silicon carbide, 20g of gypsum hemihydrate, 5g of tributyl phosphate and 5g of formalin into the mixture, stir for 25min, add 10g of curing agent, and continue stirring for 5min to obtain a slurry;

Step 2, select a mold according to the size of the parallel grinding wheel abrasive, inject the slurry described in step 1 into the mold, let stand for 2 hours at a temperature of 18°C and a relative humidity of 50%, and then demould to obtain a semi-finished product;

Step 3, dry the semi-finished product described in step 2 naturally for 12 hours, then place it in a blast drying oven, blow dry it at 50°C for 12 hours, and then dry it at 80°C for 12 hours;

Step 4, machining (machining the outer skin, excircle and chamfering) the semi-finished product after blast drying in the step 3 to obtain a flat emery wheel abrasive tool with an outer diameter of 200mm, a thickness of 50mm, and an inner diameter of 50mm.

The abrasive tool prepared in this example has a density of 1200kg/m ³ , a hardness reaching the national standard (GB/T2484-2006) Q grade, and good wear resistance. When the abrasive tool is used for polishing the surface of a copper-plated roller with a diameter of 50 mm, the surface It can reach 0.06 micron, no scratches on the surface, low wear and long service life.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any way. All simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the invention still belong to the technical solution of the present invention. within the scope of protection.

Claims (5)

1. A flexible urea-formaldehyde resin abrasive tool is characterized in that it is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 800-1200 parts of silicon carbide, and 50-150 parts of PVA solution with a mass concentration of 2% to 8%. 5-20 parts of tributyl phosphate, 5-20 parts of formalin, 0.1-1 part of sodium dodecyl sulfonate, 10-60 parts of curing agent, 20-100 parts of hemihydrate gypsum, 50-50 parts of water 200 parts; the curing agent is formed by mixing hydrochloric acid with a mass concentration of 16% to 20% and ammonium chloride solution with a mass concentration of 18% to 22% according to the volume ratio of (3 to 5):1. 2. A flexible urea-formaldehyde resin abrasive tool according to claim 1, characterized in that it is made of the following raw materials in parts by weight: 1000 parts of urea-formaldehyde resin glue, 900-1100 parts of silicon carbide, and a mass concentration of 2% to 8 80-100 parts of PVA solution, 8-15 parts of tributyl phosphate, 8-15 parts of formalin, 0.2-0.8 parts of sodium dodecylsulfonate, 20-40 parts of curing agent, 50 parts of hemihydrate gypsum -80 parts, 100-150 parts of water. 3. A kind of flexible urea-formaldehyde resin grinding tool according to claim 2, is characterized in that, is made of the raw material of following weight parts: 1000 parts of urea-formaldehyde resin glue, 1000 parts of silicon carbide, mass concentration is 90 parts of PVA solution of 5% 10 parts of tributyl phosphate, 10 parts of formalin, 0.5 parts of sodium lauryl sulfonate, 30 parts of curing agent, 60 parts of hemihydrate gypsum, and 120 parts of water. 4. A flexible urea-formaldehyde resin abrasive tool according to claim 1, 2 or 3, characterized in that the solid content of the urea-formaldehyde resin glue is 46%-55%. 5. A method for preparing flexible urea-formaldehyde resin abrasive tools as claimed in claim 1, 2 or 3, is characterized in that, comprises the following steps: Step 1. Dissolve sodium dodecylsulfonate in water, then add urea-formaldehyde resin glue and PVA solution to the dissolved solution, stir evenly, and then add silicon carbide, hemihydrate gypsum, phosphoric acid to the evenly stirred mixture Tributyl ester and formalin, after stirring for 10min to 30min, add curing agent, continue stirring for 5min to 10min to obtain slurry; Step 2: inject the slurry described in step 1 into the mold, let stand for 2h-4h at a temperature of 18°C-22°C, and a relative humidity of 50%-70%, and then demould to obtain a semi-finished product; Step 3. Dry the semi-finished product described in step 2 naturally for 8 hours to 12 hours, then place it in a blast drying oven, and dry it for 10 hours to 15 hours at 40°C to 50°C, and then blow it at 70°C to 80°C. Air drying 10h ~ 15h; Step 4: Machining the semi-finished product after blast drying in Step 3 to obtain a flexible urea-formaldehyde resin abrasive tool.