CN111087829B - Medical stone and plant fiber composite material and manufacturing process thereof - Google Patents

Abstract

The invention relates to a medical stone and plant fiber composite material and a manufacturing process thereof, wherein the main materials of the composite material are medical stone and plant fiber powder, a mixed auxiliary agent is a mixture of stearic acid, titanate, a silane coupling agent, calcium stearate and zinc borate, wherein the medical stone and the plant fiber powder are controlled to be 60-80 meshes for mixed reaction, and the mixing and die-pressing are carried out at a high pressure and a low temperature compared with the conventional thermosetting process. The invention is compatible with two characteristics of medical stone and plant fiber, greatly improves the hydrophobicity of the plant fiber, increases the toughness of the medical stone in the composite material, simultaneously keeps the excellent performance of the melamine resin material and reduces the production cost. And can release trace elements and negative ions, and is suitable for daily life.

Description

Medical stone and plant fiber composite material and manufacturing process thereof

Technical Field

The invention relates to the technical field of inorganic and organic composite material manufacturing, in particular to a medical stone and plant fiber composite material and a manufacturing process thereof.

Background

Common tableware in life mainly comprises products such as plastic, glass, pottery, porcelain and the like, but a large amount of waste plastic causes serious pollution to the ecological environment, and the materials such as the glass, the pottery, the porcelain and the like are easy to crack and are inconvenient to use. With the rise of melamine resin tableware, the traditional container manufacturing process is broken through, the problems existing in the traditional container are solved, but the manufacturing cost of the container is high, as a product for quick consumption or disposable consumption, a merchant is inevitably in selection of the container, the factor of high cost is considered, negative ideas and corresponding actions are generated over time, for example, actions such as replacing melamine resin with toxic urea resin, and the like, and serious influences are caused. Aiming at the phenomenon, the waste plant fiber is used for manufacturing the container in the market, so that the environment-friendly and economical container is realized. The plant fiber container has the problems of poor hydrophobicity, suitability for places with rapid consumption and poor texture of the plant fiber container applied to households and places with relative interest. In recent years, the rise of medical stone is favored by consumers, and the medical stone contains trace elements beneficial to human bodies, so that the trend and the guide are to be used for manufacturing easy utensils. However, the medical stone as a vessel has high cost and poor toughness. If the plant fiber can be combined with the medical stone, the toughness of the container vessel is greatly improved, the medical stone belongs to inorganic matters, the plant fiber belongs to organic matters, and the technology of stably combining the medical stone and the plant fiber is to be further researched.

Disclosure of Invention

Aiming at the problems, the invention provides the medical stone and plant fiber composite material and the manufacturing process thereof, which not only solve the problem of poor toughness of a medical stone container, but also increase the hydrophobicity of plant fibers, solve the problem of hydroxyl property of the plant fibers, greatly reduce the use of modified thermosetting resin raw materials such as melamine resin and the like and reduce the cost.

In order to realize the purpose, the following technical scheme is adopted: the medical stone and plant fiber composite material comprises main materials of medical stone and plant fiber powder, and the weight ratio of each component is as follows: 35-40% of medical stone and 20-25% of plant fiber powder; 1-3% of mixed auxiliary agent of stearic acid, titanate, silane coupling agent, calcium stearate and zinc borate; 30-40% of mixture of melamine resin, finishing powder, titanium dioxide, pigment, antioxidant and gloss agent.

Further, the mixing auxiliary agent comprises the following components in percentage by weight: 30-40% of stearic acid, 30-40% of titanate, 10-15% of silane coupling agent, 5-10% of calcium stearate and 5-10% of zinc borate.

Furthermore, the plant fiber powder is one or a mixture of several of the refined crop straws, rice husks, corncobs and wood chips.

A manufacturing process of medical stone and plant fiber composite material comprises the following process steps:

step one, respectively crushing medical stone and plant fiber powder in a crusher;

step two, thinning the crushed medical stone and plant fiber in a thinning machine, controlling the particle size of the thinned medical stone and plant fiber to be 50-200 meshes, and placing the powder which is sieved by 60-80 meshes in a high-speed mixer, wherein the powder which is smaller than 60 meshes is circularly thinned;

adding stearic acid, titanate, a silane coupling agent, calcium stearate and a zinc borate mixed aid into the refined powder, and mixing the materials in a high-speed mixer for 10-20 minutes; the temperature is controlled to be 20-60 ℃, and the rotating speed is 400-;

step four, adding the mixture of the mixed raw materials and melamine resin, the finishing powder, the titanium dioxide, the pigment, the antioxidant and the gloss agent into a high-speed mixer, mixing for 10-20 minutes, and sieving, wherein the temperature is controlled to be 20-60 ℃, and the rotating speed is 400-1000 r/min;

step five, performing one-step compression molding on the mixed raw materials into a rough blank by using a molding press at the temperature of 160-;

sixthly, coating a layer of melamine resin coating on the surface of the rough blank, and drying in drying equipment to remove the solvent and the micromolecular substances;

and step seven, performing one-time die pressing on the coated and dried rough blank by using a die pressing machine again, wherein the temperature is 140-160 ℃, the pressure is 180-210MPa, and the time is 60-200 seconds, so as to obtain a final finished product.

The invention has the beneficial effects that: the accurate thinning precision of the medical stone and the plant fiber and the proportion of the medical stone and the plant fiber to the corresponding auxiliary agent enable the medical stone and the plant fiber to achieve the best coupling effect, and the product forming rate is extremely high. The two characteristics of medical stone and plant fiber are compatible, the hydrophobicity of the plant fiber is greatly improved, the toughness of the medical stone material is increased, the excellent performance of the melamine resin material is retained, the melamine resin is greatly reduced as the main raw material, and the production cost is reduced by about two thirds. The invention is suitable for the field of containers and articles for daily use such as tableware, kitchen ware, bathroom accessories and the like, can release trace elements and anions, and is suitable for daily use.

Detailed Description

The present invention is further described with reference to the following examples, which are only used to more clearly illustrate the technical solutions of the present invention, and the protection scope of the present invention is not limited thereby.

The manufacturing process experiment of the technical scheme is carried out on the basis of one kilogram of small raw materials, the experiment focuses on the coupling combination of medical stone and plant fibers, and the mixture of melamine resin, finishing powder, titanium dioxide, pigment, antioxidant and gloss agent is a corresponding auxiliary agent including appearance requirements based on the molding of a melamine resin product, so that the mixture is set to be a fixed value and is marked as a mixture M.

The process comprises the following steps:

step one, respectively crushing medical stone and plant fiber powder in a crusher.

And step two, thinning the crushed medical stone and plant fibers in a thinning machine, controlling the particle size of the thinned medical stone and plant fibers to be 50-200 meshes, putting the sieved powder with 60-80 meshes into a high-speed mixer, circularly thinning the powder with less than 80 meshes, and enabling the particles with more than 80 meshes to be too fine and dispersed, the coupling effect to be poor, and the plant fibers with less than 50 meshes to be too coarse and contain more impurities.

Adding stearic acid, titanate, a silane coupling agent, calcium stearate and a zinc borate mixed aid into the refined powder, and mixing the materials in a high-speed mixer for 10-20 minutes; controlling the temperature at 20-60 deg.C and the rotation speed at 30-1000 rpm, wherein the stearic acid is mainly used for stabilization and surface active treatment; titanate is coupled through the chemical action of alkoxy directly with trace carboxyl or hydroxyl adsorbed on the surface of the filler or pigment, and the coupling crosslinking reaction effect is realized on the plant fiber and the resin; the silane coupling agent is mainly used for improving the hydrophobicity of the material, so that medical stone and plant fiber are subjected to pretreatment reaction, and are subjected to more effective fusion coupling with resin after being uniformly dispersed; the calcium stearate is mainly used for enhancing the dispersion effect of medical stone and plant fiber; the zinc borate is mainly used for enhancing the coupling reaction effect of medical stones and plant fibers, and because a silane coupling agent, calcium stearate and zinc borate are added, a crystallization reaction can be generated at the temperature of over 60 ℃.

And step four, adding the mixed raw materials and the mixture of the melamine resin, the finishing powder, the titanium dioxide, the pigment, the antioxidant and the gloss agent into a high-speed mixer, mixing for 10-20 minutes, and sieving, wherein the temperature is controlled to be 20-60 ℃, and the rotating speed is 400-1000 rpm.

And step five, performing one-step compression molding on the mixed raw materials into a rough blank by using a molding press at the temperature of 160-170 ℃, wherein the pressure must be controlled at 180-210MPa for 60-200 seconds because the medical stone belongs to inorganic chemical substances, has high strength and poor molecular flow capacity and is prevented from being scattered.

And sixthly, coating a layer of melamine resin coating on the surface of the rough blank, and drying in drying equipment to remove the solvent and the micromolecular substances.

And step seven, performing one-time die pressing on the coated and dried rough blank by using a die pressing machine again, wherein the temperature is 140-160 ℃, the pressure is 180-210MPa, and the time is 60-200 seconds, so as to obtain a final finished product.

Example 1

The weight ratio of each component is as follows

Components	Mass ratio of
		Medical stone	40
Straw and stalk	20
		Stearic acid	0.6
Titanate esters	0.6
		Silane coupling agent	0.4
Calcium stearate	0.2
		Zinc borate	0.2
Mixture M	38

Analysis of the test results: the product has good fluidity of the dispersant, the weight of the molded product is between 108 and 111 grams, the weight of the product is increased by about 10 percent, the specific gravity/density value of the product is 1250, and the stability is relatively good. In a falling test, the falling of the free falling body with the height of 1.5 meters does not cause damage; the free falling body with the height higher than 1.5 meters falls for 5 times, and the surface has cracks.

Example 2

Analysis of the test results: the product has very poor fluidity of the dispersant, the weight of the molded product is between 113 and 116 grams, the weight of the product is increased by about 15 percent, the specific gravity/density value of the product is 1390, the surface is caked, the hand feeling quality is poor and the stability is poor. In the drop test, the body is dropped 5 times and 4 times in a free falling body with the height of 1.5 meters, and the local body is locally cracked and accompanied by broken slag.

Example 3

Components	Mass ratio of
		Medical stone	40
Straw and stalk	20
		Stearic acid	0.3
Titanate esters	0.3
		Silane coupling agent	0.2
Calcium stearate	0.1
		Zinc borate	0.1
Mixture M	39

Analysis of the test results: the product has poor fluidity of the dispersant, the weight of the molded product is between 110 and 112 grams, the weight of the product is increased by about 11 percent, the specific gravity/density value of the product is 1265, and the surface of the product has a few pits and fine particles. In a drop test, the free falling body is dropped for 5 times at a height of 4 meters, and no damage is caused; the freely falling body with the height higher than 1.5 meters falls for 5 times, and the surface cracks for 2 times.

Example 4

Components	Mass ratio of
		Straw and stalk	40
Stearic acid	0.6
		Titanate esters	0.6
Silane coupling agent	0.4
		Calcium stearate	0.2
Zinc borate	0.2
		Mixture M	58

Analysis of the test results: only part of the product is molded, the fluidity of the dispersant of the product is very poor, the molded product has the weight of 115-118 g, the weight of the product is increased by about 17 percent, the specific gravity/density value of the product is 1350, the surface is caked, the hand feeling quality is poor, the color and luster are poor, and the stability is poor. And (4) in a dropping experiment, the steel plate is dropped for 5 times in a free-falling body with the height of 1.5 meters, and no damage is seen.

Example 5

The mixture ratio is the component mixture ratio in example 1, and the process conditions are changed as follows

Step 4	The temperature is controlled to be 70 DEG C
		Step 5	The temperature is 180 ℃, the pressure is 150 and 180MPa,
step 7	The temperature is 130 ℃, the pressure is 150-180MPa,

analysis of the test results: the product has poor fluidity of the dispersant, the weight of the molded product is between 115 and 118 grams, the weight of the product is increased by about 17 percent, the specific gravity/density value of the product is 1250, and the stability is better. And (4) in a dropping experiment, the steel plate is dropped for 5 times in a free-falling body with the height of 1.5 meters, and no damage is seen.

Example 6

The mixture ratio is the component mixture ratio in the example 2, and the process conditions are changed as follows

Step 4	The temperature is controlled to be 70 DEG C
		Step 5	The temperature is 180 ℃, the pressure is 150 and 180MPa,
step 7	At a temperature of130 ℃, the pressure of 150 and 180MPa,

analysis of the test results: the product has very poor fluidity of the dispersant, the weight of the molded product is between 113 and 116 grams, the weight of the product is increased by about 15 percent, the specific gravity/density value of the product is 1360, the surface is slightly agglomerated, the hand feeling quality is poor, and the stability is poor. Drop test, 5 drops in a 1.5 m high free-fall, with 1 local break with little debris.

Example 7

Test reports and comparisons of examples 1, 4, 5

Reported data for antibacterial detection of rhine from example 1

Claims (4)

1. The medical stone and plant fiber composite material is characterized in that the composite material is mainly prepared from medical stone and plant fiber powder, and the weight ratio of the components is as follows: 35-40% of medical stone and 20-25% of plant fiber powder; 1-3% of mixed auxiliary agent of stearic acid, titanate, silane coupling agent, calcium stearate and zinc borate; 30-40% of mixture of melamine resin, finishing powder, titanium dioxide, pigment, antioxidant and gloss agent.

2. The medical stone and plant fiber composite material as claimed in claim 1, wherein the mixing aid comprises the following components in percentage by weight: 30-40% of stearic acid, 30-40% of titanate, 10-15% of silane coupling agent, 5-10% of calcium stearate and 5-10% of zinc borate.

3. The medical stone and plant fiber composite material as claimed in claim 1, wherein the plant fiber powder is one or more of the mixture of the refined crop straw, rice hull, corncob and wood chip.

4. The process for preparing a medical stone and plant fiber composite material as claimed in claim 1, wherein the process comprises the following steps:

step one, respectively crushing medical stone and plant fiber powder in a crusher;

step two, thinning the crushed medical stone and plant fiber in a thinning machine, controlling the particle size of the thinned medical stone and plant fiber to be 50-200 meshes, and placing the powder which is sieved by 60-80 meshes in a high-speed mixer, wherein the powder which is smaller than 60 meshes is circularly thinned;

adding stearic acid, titanate, a silane coupling agent, calcium stearate and a zinc borate mixed aid into the refined powder, and mixing the materials in a high-speed mixer for 10-20 minutes; the temperature is controlled to be 20-60 ℃, and the rotating speed is 400-;

step four, adding the mixture of the mixed raw materials and melamine resin, the finishing powder, the titanium dioxide, the pigment, the antioxidant and the gloss agent into a high-speed mixer, mixing for 10-20 minutes, and sieving, wherein the temperature is controlled to be 20-60 ℃, and the rotating speed is 400-1000 r/min;

step five, performing one-step compression molding on the mixed raw materials into a rough blank by using a molding press at the temperature of 160-;

sixthly, coating a layer of melamine resin coating on the surface of the rough blank, and drying in drying equipment to remove the solvent and the micromolecular substances;

and step seven, performing one-time die pressing on the coated and dried rough blank by using a die pressing machine again, wherein the temperature is 140-160 ℃, the pressure is 180-210MPa, and the time is 60-200 seconds, so as to obtain a final finished product.