阅读说明：本技术 一种有机硅树脂的脱色脱离子方法 (Decolorizing and deionizing method of organic silicon resin ) 是由 胡磊杰 胡孟进 于 2019-11-26 设计创作，主要内容包括：本发明属于树脂合成领域,特别涉及一种有机硅树脂的脱色脱离子方法,本发明方法在制备有机硅树脂的工艺过程中增加了脱色、脱离子工艺,将水洗后的物料从下部压送进脱色塔,在压力的推动作用下,从上部溢流而出,再经调聚缩聚制得有机硅树脂,本发明方法解决了有机硅树脂制备过程中由于水中杂质离子引起的树脂应用过程中的消光问题,满足了用户的使用要求。(The invention belongs to the field of resin synthesis, and particularly relates to a decoloring and deionizing method for organic silicon resin.)

1. A decolorization and separation method for silicone resin is characterized by comprising the following steps:

(1) preparing raw materials according to a proportion;

the raw materials comprise basic organic silicon monomers, special organic silicon monomers and organic solvents;

(2) hydrolysis: fully mixing the organosilicon monomers in the step (1) in proportion, and adding the mixture into an organic solvent for co-hydrolysis;

(3) after hydrolysis, washing with water, conveying the washed material into a decoloring tower from the lower part under pressure, overflowing the material from the upper part under the pushing action of pressure, adding a catalyst into the decolored material for telomerization and polycondensation, adding a regulator to reduce the degree of gelation, and regulating the mass fraction of the silicone resin solution to 50% to obtain the silicone resin;

wherein, the decolorizing medium added in the decolorizing tower is as follows: cation exchange resin, diatomite, activated carbon, molecular sieve or natural zeolite;

retention time of materials in the decoloring tower: 10-20 seconds, wherein the adsorption temperature in the decoloring process is less than 25 ℃; the pressure of the materials which are pressed into the decoloring tower from the lower part is as follows: 0.05MPa to 0.08 MPa.

2. The method of claim 1, wherein the base silicone monomer is: monomethyltrichlorosilane (M1), dimethyldichlorosilane (M2), monophenyltrichlorosilane (P1), diphenyldichlorosilane (P2); the special organic silicon monomer is as follows: one or more organosilicon monomer materials of organosilicon monomer containing double bond group, organosilicon monomer containing active hydrogen and silane coupling agent; the organic solvent is: cyclohexanone, butanone, ethyl acetate or butyl ethyl ether.

3. The method for decoloring releaser with silicone resin according to claim 2, wherein the silicone monomer containing double bond groups is methylvinyldichlorosilane, the silicone monomer containing active hydrogen is methylhydrodichlorosilane, and the silane coupling agent is triethoxysilane containing epoxy groups, triethoxysilane containing ester groups, and triethoxysilane containing amine groups, acryl groups, etc.

4. The method for decoloring a debonding agent of a silicone resin according to claim 1, wherein in the total silicone monomer, the ratio of the number of organic groups R on a silicon atom to the number of silicon atoms, R/Si is between 1.0 and 1.6, the number of phenyl groups is 15 to 60% of the total number of R, and the mass of the special silicone monomer is 10 to 40% of the total mass of the silicone monomer; the dosage of the organic solvent is 2-4 times of the mass of the water; the water amount is 1-2 times of the total mass of the organic silicon monomer.

5. The method for decoloring a silicone resin according to claim 1, wherein the cohydrolysis temperature is 4 to 10 ℃; the added catalyst is a transition metal salt catalyst, and the dosage of the catalyst is 1-2 per mill of the total mass of the organic silicon monomer; the added regulator is organosilicon oligomer with hydroxyl, epoxy or ester group, and the dosage of the organosilicon oligomer is 20-30% of the total mass of the organosilicon monomer.

6. The method for removing discolored silicone resin as claimed in claim 1, wherein the discoloring medium added to the discoloring tower is organic high molecular polymer modified diatomaceous earth.

7. The method for decolorizing and releasing the silicone resin according to claim 6, wherein the method for modifying diatomaceous earth with organic high molecular polymer comprises: firstly, pretreating diatomite, mixing the diatomite and the organic high molecular polymer in an aqueous solution after pretreatment, stirring to uniformly disperse the diatomite, drying, crushing and grinding to obtain the organic high molecular polymer modified diatomite.

8. The method for decolorizing and releasing silicone resins according to claim 6, characterized in that the organic high molecular polymer modified diatomaceous earth comprises the following specific steps:

(1) placing diatomite in a hydrochloric acid, sulfuric acid or nitric acid solution, performing ultrasonic treatment at 30-40 ℃ for 30-60min, washing to be neutral, performing centrifugal separation, drying, and grinding through a 400-mesh sieve for later use; wherein the concentration of the hydrochloric acid, sulfuric acid or nitric acid solution is 5-20%;

(2) and (2) mixing the diatomite treated in the step (1) with the organic high molecular polymer in an aqueous solution, stirring to uniformly disperse the diatomite, drying, crushing and grinding to obtain the organic high molecular polymer modified diatomite.

9. The method for decolorizing and releasing the silicone resin according to claim 8, wherein the organic high molecular polymer is polydimethyldiallylchloride, polydicyanamide formaldehyde or polyacrylamide, and the amount of the added organic high molecular polymer is 1 to 10% by mass of the diatomaceous earth.

Technical Field

The invention belongs to the field of resin synthesis, and particularly relates to a decoloring and stripping method for organic silicon resin.

Background

The organic silicon resin is an important member in the organic silicon material, is different from the linear structure of the organic silicon rubber and the small molecular weight of the silicon oil and the silane, is a three-dimensional net structure, and has the basic properties of the organic silicon material, such as high temperature resistance, low temperature resistance, high insulation, weather resistance, radiation resistance, chemical resistance, hydrophobicity and the like.

Because the traditional production of the organic silicon resin uses deionized water or deionized water, the cost is higher, and in order to reduce the production cost, the existing production process changes the deionized water or deionized water into tap water for hydrolysis and washing, so that impurity ions (such as iron ions) in the tap water are introduced into the product, the prepared final product has certain yellow color, and the extinction phenomenon is easy to occur after curing, so that the application of the product needing brightness is greatly influenced.

Disclosure of Invention

In order to solve the technical problems in the prior art, the invention provides a decolorization and separation method of a silicone resin. The method adds the processes of decolorization and deionization in the process of preparing the organic silicon resin, and sends the material after water washing into the decolorization tower for decolorization, thereby solving the problem of extinction caused by impurity ions in water in the synthesis process of the organic silicon resin when the resin is applied.

The method for preparing the organic silicon resin by adopting the hydrolysis internal circulation process comprises the following specific process steps:

(1) preparing raw materials according to a proportion;

wherein, the raw materials for synthesizing the organic silicon resin are as follows:

basic silicone material monomer: monomethyltrichlorosilane (M1), dimethyldichlorosilane (M2), monophenyltrichlorosilane (P1), diphenyldichlorosilane (P2);

wherein, the purity of the methyl trichlorosilane is more than 99 percent;

dimethyldichlorosilane with purity of more than 99.9%;

mono-phenyl trichlorosilane, purity > 99%;

the purity of the diphenyl dichlorosilane is more than 97 percent;

special organosilicon monomer: can be as follows: one or more than one organic silicon monomer material of organic silicon monomer containing double bond group, organic silicon monomer containing active hydrogen or silane coupling agent.

Wherein, the organosilicon monomer containing double bond group can be methyl vinyl dichlorosilane;

the organosilicon monomer containing active hydrogen can be methyl hydrogen dichlorosilane;

the silane coupling agent is: epoxy-containing triethoxysilane, ester-containing triethoxysilane, and amino-and acryloyl-containing triethoxysilane.

In the total organosilicon monomers, the ratio of the number of organic groups R on silicon atoms to the number of silicon atoms, R/Si is 1.0-1.6, the number of phenyl groups accounts for 15-60% of the total number of R, and the mass of the special organosilicon monomers accounts for 10-40% of the total mass of the organosilicon monomers.

The organic solvent is: ketone, ether or lipid solvents.

The organic solvent may specifically be: cyclohexanone, butanone, ethyl acetate or butyl ether, wherein the amount of the organic solvent is 2-4 times of the mass of the water;

the water amount is 1-2 times of the total mass of the organic silicon monomer.

(2) Hydrolysis: fully mixing the organic silicon monomers in proportion, and then adding the mixture into an organic solvent for co-hydrolysis;

the cohydrolysis temperature is 4-10 ℃.

(3) And (3) after the hydrolysis is finished, washing with water, conveying the washed material into a decoloring tower from the lower part under pressure, overflowing from the upper part under the pushing action of pressure, adding a catalyst into the decolored material for telomerization and polycondensation, adding a regulator to reduce the gel degree, and regulating the mass fraction of the silicon resin solution to 50% to obtain the organic silicon resin.

Wherein, the decolorizing medium added in the decolorizing tower can be: cation exchange resin, diatomite, active carbon, molecular sieve, natural zeolite, etc.

The decolorizing medium added in the decolorizing column is preferably: organic high molecular polymer modified diatomite;

the method for modifying the diatomite by the organic high molecular polymer comprises the following steps: firstly, pretreating diatomite, mixing the diatomite and the organic high molecular polymer in an aqueous solution after pretreatment, stirring to uniformly disperse the diatomite, drying, crushing and grinding to obtain the organic high molecular polymer modified diatomite.

The specific preparation method of the organic high molecular polymer modified diatomite comprises the following steps:

(1) placing diatomite in a hydrochloric acid, sulfuric acid or nitric acid solution, performing ultrasonic treatment at 30-40 ℃ for 30-60min, washing with water to be neutral, performing centrifugal separation, drying, and grinding through a 400-mesh sieve for later use; wherein the concentration of the hydrochloric acid, sulfuric acid or nitric acid solution is 5-20%;

(2) mixing the diatomite treated in the step (1) with an organic high molecular polymer in an aqueous solution, stirring to uniformly disperse the diatomite, drying, crushing and grinding to prepare organic high molecular polymer modified diatomite;

wherein the organic high molecular polymer can be polydimethyl diallyl ammonium chloride, polydicyanamide formaldehyde or polyacrylamide, and the adding amount of the organic high molecular polymer is 1-10% of the mass of the diatomite.

The surface activity of the diatomite is improved by carrying out acid washing pretreatment on the diatomite, and then the diatomite is modified by adopting an organic high molecular polymer, so that the decoloring and deionizing effects can be better improved.

Retention time of materials in the decoloring tower: 10-20 seconds, wherein the adsorption temperature in the decoloring process is less than 25 ℃; the pressure of the materials which are pressed into the decoloring tower from the lower part is as follows: 0.05MPa to 0.08 MPa.

The added catalyst is transition metal salt catalyst, specifically platinum chloride, cobalt naphthenate, lead acetate or zinc acetate, and the dosage of the catalyst is 1-2 per mill of the total mass of the organosilicon monomer.

The added regulator is organosilicon oligomer with hydroxyl, epoxy or ester group, and the dosage of the organosilicon oligomer is 20-30% of the total mass of the organosilicon monomer.

Has the advantages that:

(1) the organic silicon resin product prepared by the method is colorless and free of impurity ions, solves the extinction problem of the product and can meet the use requirements of users.

(2) Compared with the processes of hydrolysis and water washing by adopting deionized water or deionized water, the production cost is greatly reduced.

Drawings

FIG. 1 is a flow chart of the process for synthesizing silicone resin according to the present invention.

Detailed Description

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