CN104858801B - Production method without re-glue coated abrasive tool - Google Patents

Abstract

The invention discloses a production method of a non-adhesive coated abrasive tool. Firstly, a primer layer is applied. The thickness of the primer layer is 80%±5% of the total thickness of the traditional primer layer+coating layer. The primer used The viscosity is 1~3 times that of the traditional primer; the abrasive is adhered to the primer layer according to the conventional process, and then hung to dry. In order to improve the bonding force between the primer layer and the substrate layer, before applying the primer layer, the substrate layer is first coated with a pre-coating layer. The advantage of the present invention is that the adhesive layer coated on the surface of the abrasive particles for fixing the abrasive particles is removed, the grinding efficiency of the coated abrasive is greatly improved, the working temperature during grinding is reduced, and the adhesive layer is also avoided. Contamination of the grinding face. The thickened primer layer can ensure that the abrasive particles are firmly bonded to it to resist the impact force during grinding; increasing the viscosity of the primer can prevent glue flow during the production process and affect the coated abrasives finished product quality.

Description

Production method of adhesive-free coated abrasive

technical field

The invention relates to the production of coated abrasives, in particular to a production method of non-adhesive coated abrasives.

Background technique

Coated abrasives include abrasive belts or strips made of cloth, paper, film or other substrates. The current coated abrasives generally include a base material layer and a primer layer, an abrasive layer and an overcoating layer coated on the base layer in sequence. Add the fifth layer - super coating on the glue layer. Among them, the role of the compound layer is to firmly bond the abrasive particles to the substrate together with the primer layer to resist the impact force during grinding, so that the coated abrasive has a long-term grinding ability.

The main component of the adhesive layer is phenolic resin, which has certain elasticity and viscosity. When grinding, the adhesive layer covering the surface of the abrasive will contact the grinding surface together with the abrasive, which not only reduces the grinding efficiency, but also increases the grinding temperature. , and will pollute the grinding face.

Contents of the invention

The object of the present invention is to provide a production method of the coated abrasive without re-adhesive, so as to completely eliminate the adverse effect of the re-adhesive layer on the coated abrasive during grinding.

To achieve the above object, the present invention can take the following technical solutions:

The production method of the adhesive-free coated abrasive tool of the present invention is characterized in that: comprising the following steps:

The first step is to apply the primer layer:

Apply a primer layer on the substrate layer, the thickness of the primer layer is 80%±5% of the total thickness of the traditional primer layer + re-adhesive layer, and the viscosity of the primer used is 1~ of that of the traditional primer layer 3 times;

The second step, sanding

Adhere the abrasive to the primer layer according to the conventional process, and then hang it to dry.

In order to improve the bonding force between the primer layer and the substrate layer, before applying the primer layer, the substrate layer is first coated with a pre-coating layer.

Due to the increased thickness of the primer layer, when applying the primer layer, two sets of primer rollers with a distance of 6 to 10 meters can be used to apply in sequence to ensure the uniformity of the primer layer. The coating temperature is 38 ~42°C, a hot air dryer at 100°C is installed between the two sets of rolling cars. The present invention increases the traditional coating construction temperature from 28-32°C to 38-42°C (increased by 10°C), which can offset the decrease in the wettability of the primer to the abrasive due to the increase in the viscosity of the primer.

In order to increase the bonding force between the abrasive material and the primer layer, the abrasive material can be iridium-plated abrasive material, and the super-strong bonding force between the iridium-plated layer and the primer layer can be used to ensure the bonding firmness of the abrasive material.

In order to ensure the quality of the finished coated abrasive, after the abrasive is adhered to the primer layer in the second step, keep the abrasive layer on the top and the base material on the bottom and send it into the heating channel (the length is 30 meters) Drying in 80°C, and then hanging for drying. The added tile heating process can also fully settle and infiltrate the abrasive in the primer, ensuring a firm bond between the primer and the abrasive.

The advantage of the present invention is that the adhesive layer coated on the surface of the abrasive particles for fixing the abrasive particles is removed, the grinding efficiency of the coated abrasive is greatly improved, the working temperature during grinding is reduced, and the adhesive layer is also avoided. Contamination of the grinding face. The thickened primer layer can ensure that the abrasive particles are firmly bonded to it to resist the impact force during grinding; increasing the viscosity of the primer can prevent glue flow during the production process and affect the coated abrasives finished product quality.

Under the same conditions (grinding pressure 50N, grinding time 30min, grinding test piece 45# steel bar) was carried out grinding contrast test, the result:

The grinding capacity of the traditional abrasive belt is 140g, and the highest temperature is 120°C; the grinding amount of the non-adhesive abrasive belt produced by the present invention is 210g, and the highest temperature is 104°C. When measuring the temperature, use the test value in the test piece about 1mm away from the grinding point with an infrared thermometer.

That is: the grinding efficiency of the non-adhesive abrasive belt produced by the method of the present invention has been increased by 50%, and the grinding temperature has dropped by 16°C.

detailed description

The method of the present invention will be described in more detail below through specific examples.

Example 1:

The production method of the 2000-mesh non-adhesive sandpaper is as follows:

The first step is to apply the primer layer:

Apply a primer layer on the paper base material, the thickness of the primer layer is 80% of the total thickness of the traditional primer layer + re-adhesive layer (the weight of the primer used is the total amount of glue used for the traditional primer layer + re-adhesive layer 80%), the viscosity of the primer used is 1.5 times that of the traditional primer, that is, when the primer is prepared, it can be adjusted to 1500 cp (the viscosity of the traditional primer is 1000 cp), when the abrasive When the particle size is large, the viscosity of the primer can be increased appropriately;

The second step, sanding

Abrasives with a particle size of 2000 mesh are adhered to the primer layer according to the conventional process, and then hung to dry.

Example 2:

The production method of non-adhesive sandpaper with a particle size of 800 mesh is:

The first step is to apply the primer layer:

Two sets of double-roll padding cars for primer coating are used, arranged 10 meters apart, and a 100°C hot air dryer is installed between the two sets of padding cars, and the coating working temperature of the padding cars is adjusted to 38~42°C;

Weigh out the amount of primer according to 80% of the total amount of glue used in the traditional primer layer + re-adhesive layer. When preparing, half of the primer will keep the same viscosity as the traditional one, and the other half of the primer will make it thicker. The viscosity is increased to twice the viscosity of the traditional primer (up to 2000cp);

Put half of the primer with the same viscosity as the traditional one on the first set of two-roll pads, and the other half with higher viscosity on the second set of two-roll pads, and the paper substrate is coated from the first set After the primer pad car passes through, the applied adhesive layer is heated by 100°C hot air to make it slightly dry, and then enters the second set of primer pad car for secondary coating;

The second step, sanding

Select the iridium-plated abrasive with a particle size of 80 mesh, adhere it to the primer layer according to the conventional process, and then hang and dry it conventionally.

Example 3:

The production method of non-adhesive abrasive cloth with a particle size of 400 mesh is:

The first step is to apply the primer layer:

Two sets of double-roll padding cars for primer coating are used, arranged 10 meters apart, and a 100°C hot air dryer is installed between the two sets of padding cars, and the coating working temperature of the padding cars is adjusted to 38~42°C;

Weigh out the amount of primer according to 80% of the total amount of glue used in the traditional primer layer + re-adhesive layer. When preparing, half of the primer will keep the same viscosity as the traditional one, and the other half of the primer will make it thicker. The viscosity is increased to twice the viscosity of the traditional primer (up to 2000cp);

Put half of the primer with the same viscosity as the traditional one on the first set of two-roll pads, and the other half with higher viscosity on the second set of two-roll pads, and the paper substrate is coated from the first set After the primer pad car passes through, the applied adhesive layer is heated by 100°C hot air to make it slightly dry, and then enters the second set of primer pad car for secondary coating;

The second step, sand planting:

Select the iridium-plated abrasive with a particle size of 400 mesh, adhere it to the primer layer according to the conventional process, and then keep the sand layer on the top and the substrate on the bottom, and send it to a 30-meter-long flat running heating channel for drying. The temperature is 80°C, and finally hang and dry according to the conventional process.

Example 4:

The production method of non-adhesive abrasive cloth with a particle size of 40 mesh is:

The first step is to apply a pre-coat on the substrate layer according to the conventional process;

The second step is to apply the primer layer:

Two sets of double-roll padding cars for primer coating are used, arranged 10 meters apart, and a 100°C hot air dryer is installed between the two sets of padding cars, and the coating working temperature of the padding cars is adjusted to 38~42°C;

Weigh out the amount of primer according to 80% of the total amount of glue used in the traditional primer layer + re-adhesive layer. When preparing, half of the primer will keep the same viscosity as the traditional one, and the other half of the primer will make it thicker. The viscosity is increased to 3 times the viscosity of the traditional primer (up to 3000cp);

Put half of the primer with the same viscosity as the traditional one on the first set of two-roll pads, and the other half with higher viscosity on the second set of two-roll pads, and the paper substrate is coated from the first set After the primer pad car passes through, the applied adhesive layer is heated by 100°C hot air to make it slightly dry, and then enters the second set of primer pad car for secondary coating;

The second step, sanding

Select the iridium-plated abrasive with a particle size of 40 mesh, adhere it to the primer layer according to the conventional process, and then keep the sand layer on the top and the substrate on the bottom, and send it into a 30-meter-long flat running heating channel for drying. The temperature is 80°C, and finally hang and dry according to the conventional process.

Claims (3)

1. a kind of production method without re-glue coated abrasive tool, it is characterised in that：Comprise the steps：

The first step, coated primer layer：

Coated primer layer on substrate layer, the thickness of primer layer are the 80% ± 5% of traditional primer layer+complex layer gross thickness, used 1 ~ 3 times for the gluing denseness of traditional bottom of the viscosity of primer；During coated primer layer, rolled using two sets of painting primers at a distance of 6 ~ 10 meters Car carry out successively coated, apply enclosure temperature be 38 ~ 42 DEG C；100 DEG C of hot-air drier is set between two sets of padding machines；

Second step, plants sand

By abrasive material, routinely technique is sticked on primer layer, keeps horizontality of the abrasive material in upper, base material under to be sent to It is dried in heating passage, then 80 DEG C of baking temperature resuspends drying.

2. the production method without re-glue coated abrasive tool according to claim 1, it is characterised in that：Before coated primer layer, First coated precoated shet on substrate layer.

3. the production method without re-glue coated abrasive tool according to claim 1 and 2, it is characterised in that：The abrasive material is plating Iridium abrasive material.