CN107280984B

CN107280984B - Oral care abrasive and preparation method and application thereof

Info

Publication number: CN107280984B
Application number: CN201710618752.8A
Authority: CN
Inventors: 赵银法; 江山
Original assignee: Guangxi Mantingfang Fine Chemical Co ltd
Current assignee: Guangxi Mantingfang Fine Chemical Co ltd
Priority date: 2017-07-26
Filing date: 2017-07-26
Publication date: 2020-08-25
Anticipated expiration: 2037-07-26
Also published as: CN107280984A

Abstract

The invention discloses an oral care abrasive, which is mainly prepared by calcium carbonate particles with different particle sizes according to a certain proportion, wherein the particle size distribution is as follows: d10 particle size is 0.5-1.0 μm; d50 particle size is 8-13 μm; the D90 particle size is 19-25 μm. The invention also discloses a preparation method and application of the oral care abrasive. Compared with the prior art, the abrasive has a higher PCR value and a lower RDA value, has small abrasion to enamel, has good cleaning effect, can meet the requirements of cleaning oral cavity and whitening teeth, has good cleaning effect, and can prevent the damage to the enamel.

Description

Oral care abrasive and preparation method and application thereof

Technical Field

The invention relates to the technical field of oral care, in particular to an oral care abrasive, a preparation method and application thereof.

Background

Oral care cleansing oral abrasives are an important component of the formulation and have the effect of cleaning stains, stains and plaque from the tooth surface. Common abrasives are calcium carbonate, calcium dioxide, light calcium phosphate, and the like.

Two important indicators for evaluating the cleaning effect of the abrasive on tooth stains are two important indicators, namely, the cleaning effect of the abrasive on tooth stains is generally evaluated by using a biofilm cleaning experiment model (PCR), which is reported in 1982 by the American university of Indiana and is used for evaluating the effect of the abrasive or toothpaste on removing the tooth stains, the PCR result has good correlation with clinical experiments (r is 0.85), and the PCR is widely used in the European and American toothpaste industry for evaluating the effect of the abrasive or toothpaste on physically removing the tooth stains. The second is the Abrasion value of the abrasive to enamel and Dentin, which is usually measured by a radiotracer assay (Radioactive toxin Abrasion), abbreviated as RDA value.

The ideal friction value for the oral cleaning and nursing product has a higher PCR value and a lower RDA value, thereby having good cleaning effect and preventing the damage to enamel. The existing abrasive cleans the enamel by means of physical friction, and high cleaning effect is often accompanied with abrasion of the enamel. Or the PCR value is low, and the cleaning effect cannot be achieved; or the PCR value is high, although the cleaning effect is good, the RDA value is also higher, the damage to enamel and dentin is larger, and the wedge defect of teeth can be caused after long-term use, so that the oral health is influenced.

Therefore, the novel abrasive which has a good cleaning effect and a weak abrasion effect on enamel is developed, and has good market prospect and significance.

Disclosure of Invention

The invention aims to provide an abrasive for oral care, which has a high PCR value and a low RDA value, is small in abrasion to enamel, has a good cleaning effect, can meet the requirements of cleaning oral cavity and whitening teeth, has a good cleaning effect, and can prevent the enamel from being damaged.

The technical scheme of the invention is as follows: the oral care abrasive is mainly prepared by calcium carbonate particles with different particle sizes which are distributed according to a certain proportion, wherein the particle size distribution is that the particle size of D10 is 0.5-1.0 mu m; d50 particle size is 8-13 μm; the D90 particle size is 19-25 μm.

In a preferable embodiment of the present invention, the particle size distribution of the abrasive is such that the particle size of D10 is 0.7 to 0.9 μm; d50 particle size is 10-11 μm; the D90 particle size is 20-22 μm.

Specifically, the abrasive is prepared by physically crushing natural calcium carbonate.

The invention also aims to provide a preparation method of the oral care abrasive, which comprises the following steps: the friction agent is prepared by selecting natural calcium carbonate as a raw material and physically crushing the natural calcium carbonate by a Raymond mill and a ring roller mill in sequence.

Preferably, the natural calcium carbonate is calcite.

Preferably, the natural calcium carbonate is firstly subjected to primary crushing, then is cleaned and aired, and then is crushed in a Raymond mill.

Preferably, when the Raymond mill is used for crushing, the current of the main machine is controlled to be 72-78A; fan current is 70-85A; the rotational speed of the classifier is 860-970 r/min.

Preferably, when the ring roller mill is used for crushing, the frequency conversion number of the feeder is controlled to be 30.0-35.0 Hz; the variable frequency of the fan is 40.0-45.0 Hz; the frequency conversion number of the grader is 20.0-30.0 Hz; the current of the feeder is 1.5-1.8A; fan current 130-; classifier currents 30-38A.

Preferably, in order to ensure that the particle size distribution of the abrasive is in a better range, namely the particle size of D10 is 0.7-0.9 μm; d50 particle size is 10-11 μm; d90 the particle size is 20-22 μm, and the current of the host is controlled to be 72-78A when the Raymond mill crushes; fan current is 70-85A; the rotating speed of the classifier 920-; when the ring roller mill is used for crushing, controlling the variable frequency number of the feeder to be 30.0-35.0 Hz; the variable frequency of the fan is 40.0-45.0 Hz; the frequency conversion number of the grader is 25.0-30.0 Hz; the current of the feeder is 1.5-1.8A; fan current 130-; classifier currents 33-38A.

The invention also discloses application of the abrasive, and the abrasive is used in toothpaste, tooth powder, gel and mouthwash.

Preferably, the abrasive is used in an amount of 20-55% by weight in toothpaste and 80-90% by weight in dentifrice.

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

the abrasive disclosed by the invention has a high PCR value and a low RDA value, has a good cleaning effect, is small in damage to enamel, is an ideal abrasive which can simultaneously give consideration to both the cleaning effect and the prevention of enamel damage, is low in cost and very high in cost performance, and can meet the requirements of consumers.

The oral care abrasive is prepared by grinding calcium carbonate by a Raymond mill, finely grinding by a ring roller mill, combining the two grinding modes, and controlling the rotating speed of a classifier to ensure that the particle size of calcium carbonate particles is distributed in a required range.

Detailed Description

The present invention will be described in further detail below with reference to specific examples.

Example 1

An oral care abrasive is mainly prepared by calcium carbonate particles with different particle sizes which are distributed according to a certain proportion, wherein the particle size distribution is that the particle size of D10 is 0.5-1.0 mu m; d50 particle size is 8-13 μm; the D90 particle size is 19-25 μm. The abrasive is prepared by physically crushing natural calcium carbonate. The preparation method comprises the following steps:

(1) selecting calcite ore with Mohs hardness of 3.0, and primarily crushing the calcite ore to about 10 cm;

(2) cleaning the primarily crushed stone ore and drying in the air;

(3) putting the dried stone ore into a Raymond mill for crushing, and controlling the current of a host of the Raymond mill to be 72-78A; fan current is 70-85A; the rotational speed of the grader is 860 and 920r/min, and the primary product is obtained by crushing;

(4) putting the primary product obtained in the step (3) into a ring roller mill, and controlling the variable frequency number of a feeder to be 30.0-35.0 Hz; the variable frequency of the fan is 40.0-45.0 Hz; the frequency conversion number of the grader is 20.0-25.0 Hz; the current of the feeder is 1.5-1.8A; fan current 130-; the current of the classifier is 30-35A, and the final product is obtained by crushing and packaging.

Example 2

An oral care abrasive is mainly prepared by calcium carbonate particles with different particle sizes which are distributed according to a certain proportion, wherein the particle size distribution is that the particle size of D10 is 0.7-0.9 mu m; d50 particle size is 10-11 μm; the D90 particle size is 20-22 μm. The abrasive is prepared by physically crushing natural calcium carbonate. The preparation method comprises the following steps:

(2) cleaning the primarily crushed stone ore and drying in the air;

(3) putting the dried stone ore into a Raymond mill for crushing, and controlling the current of a host of the Raymond mill to be 72-78A; fan current is 70-85A; the rotational speed of the grader is 920-;

(4) putting the primary product obtained in the step (3) into a ring roller mill, and controlling the variable frequency number of a feeder to be 30.0-35.0 Hz; the variable frequency of the fan is 40.0-45.0 Hz; the frequency conversion number of the grader is 25.0-30.0 Hz; the current of the feeder is 1.5-1.8A; fan current 130-; and (4) carrying out classifier current 33-38A, and crushing and packaging to obtain a final product.

Example 3

The friction agent prepared by the invention is compared with the prior friction agent: and comparing the common calcium carbonate, the friction type hydrogen dioxide and the dihydrate calcium hydrophosphate, and comparing the PCR value with the RDA value. The specific experimental method is as follows:

three samples of each friction agent are selected, the PCR value of each friction agent is measured by adopting an in-vitro PCR method, the RDA value of each friction agent is measured by adopting a radioactive tracer test method, the average value of the results of three experiments is compared, and the result is shown in the table I:

table one: comparison of PCR value and RDA value of the abrasive of the present invention with those of the conventional general abrasives

	PCR value	RDA value
			The abrasive of the invention	127	150
Friction type silica	112	140
			Calcium hydrogen phosphate dihydrate	85	103
Ordinary calcium carbonate	132	190

As can be seen from the table I, compared with the common calcium carbonate abrasive, the abrasive of the invention has equivalent PCR value, but has significantly reduced RDA value; compared with friction type silicon dioxide, the PCR value is greatly improved, and the RDA value is relative; compared with calcium hydrophosphate dihydrate, the PCR value is obviously improved. Therefore, compared with other abrasives, the abrasive has good cleaning effect, does not lose teeth, and is an ideal whitening toothpaste abrasive.

Example 4 application of the abrasive of the present invention to toothpaste

The toothpaste with the cleaning effect is produced by a general method according to the following formula, wherein the formula amount is calculated by mass parts. The toothpaste has good whitening effect, and can whiten teeth after long-term use. The specific formula is shown in the table two:

table two: toothpaste formula containing abrasive agent

Components	Amount of formulation
		Friction agent	43
Sorbitol	20
		Glycerol	5
Polyethylene glycol-8	3
		Sodium lauryl sulfate	2.0
Sodium carboxymethylcellulose	1.0
		Hydroxyethyl cellulose	0.2
Tetrasodium pyrophosphate	0.5
		Saccharin sodium salt	0.25
Sodium benzoate	0.25
		Mint essence	1.2
Formula water	The rest(s)
		Total amount of	100

The toothpaste containing the abrasive of the present invention was compared with a toothpaste containing the conventional common abrasive (common calcium carbonate, abrasive-type dioxide, etc.) (using the same preparation method, the same amount of abrasive in the toothpaste, but abrasive), and the PCR value and RDA value were compared. The specific experimental method is as follows:

three samples of each toothpaste were selected, the PCR value was measured by in vitro PCR, the RDA value was measured by radiotracer assay, the results of the three experiments were averaged and compared, and the results are shown in Table III:

table three: PCR values and RDA values for toothpastes containing abrasives of the present invention, toothpastes containing ordinary silica, calcium hydrogen phosphate:

	PCR value	RDA value
			Toothpaste prepared from abrasive of the invention	118	156
Abrasive silica toothpaste	104	143
			Calcium carbonate toothpaste	123	193

From the above table three, it can be seen that: compared with toothpaste containing silicon dioxide, the toothpaste prepared by adopting the abrasive has better cleaning effect, but has equivalent abrasion effect on enamel; compared with the common calcium carbonate toothpaste, the toothpaste prepared by adopting the abrasive has obviously reduced abrasion effect on enamel, but has equivalent cleaning effect on color spots.

Example 5 application of the abrasive of the present invention to dentifrice

According to the following formula, the dentifrice with whitening effect is prepared by adding the abrasive of the invention.

Table four: dentifrice formulations containing abrasives of the present invention

Variations and modifications to the above-described embodiments may occur to those skilled in the art, which fall within the scope and spirit of the above description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Claims

1. The oral care abrasive is characterized by being mainly prepared from calcium carbonate particles with different particle sizes according to a certain proportion, wherein the particle size distribution is as follows: d10 particle size is 0.7-0.9 μm; d50 particle size is 10-11 μm; d90, the particle size is 20-22 mu m, the abrasive is formed by physically crushing natural calcium carbonate, the abrasive is prepared by selecting natural calcium carbonate as a raw material, the natural calcium carbonate is firstly subjected to primary crushing, then is cleaned and dried, and then is crushed in a Raymond mill, and when the Raymond mill is crushed, the current of a main machine is controlled to be 72-78A; fan current is 70-85A; the rotating speed of the grader is 860-970r/min, then the ring-roller grinding physical grinding is carried out, and the variable frequency number of the feeder is controlled to be 30.0-35.0Hz when the ring-roller grinding is carried out; the variable frequency of the fan is 40.0-45.0 Hz; the frequency conversion number of the grader is 20.0-30.0 Hz; the current of the feeder is 1.5-1.8A; fan current 130-; classifier currents 30-38A.

2. Use of the abrasive according to claim 1, characterized in that: the abrasive is used in toothpaste, dentifrice, gel, and mouthwash.

3. The use of the abrasive according to claim 2, wherein the abrasive is used in an amount of 20 to 55% by weight in toothpaste and 80 to 90% by weight in dentifrice.