CN113336891B - Methyl styrene and indene modified dicyclopentadiene petroleum resin and preparation method thereof - Google Patents
Methyl styrene and indene modified dicyclopentadiene petroleum resin and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a method for preparing methyl styrene and indene modified dicyclopentadiene petroleum resin, which comprises the steps of extracting cracking C9 raw materials through styrene, separating to obtain a methyl styrene fraction A, an indene fraction B and a bicyclo fraction C, adding an inert solvent D and an auxiliary material auxiliary agent F, and carrying out polymerization reaction to prepare the petroleum resin. The invention effectively solves the problem that high-quality DCPD petroleum resin can not be produced due to low content of styrene in the cracked C9 fraction, has low requirement on the purity of raw materials, and the prepared petroleum resin has high normal-heptane value, light product color and controllable resin viscosity, and is suitable for industries of paint, rubber special adhesives, printing ink, printing and the like.
Description
Technical Field
The invention belongs to the field of chemical industry, and relates to methyl styrene and indene modified dicyclopentadiene petroleum resin and a preparation method thereof.
Background
The dicyclopentadiene (DCPD) petroleum resin is a high polymer which is widely applied, has wide raw material sources and low synthesis cost, can be applied in many aspects, has the characteristics of good thermal stability, compatibility, tackifying property, light stability, water resistance, acid and alkali resistance and the like, and is suitable for the industries of paint, rubber special adhesives, printing ink, printing and the like.
At present, domestic patents such as CN108752528B and CN107778389B disclose that DCPD petroleum resin is produced by related reports, wherein DCPD fraction prepared by separating cracked C9 fraction is taken as basic raw material, certain styrene component is mixed, and DCPD petroleum resin is prepared by adopting a thermal polymerization mode. However, with the increasing comprehensive utilization rate of cracked C9 chemical raw materials, the styrene component in the raw materials is extracted to prepare industrial-grade styrene, which brings great problems to manufacturers for preparing DCPD petroleum resin by separating the original cracked C9 raw materials, styrene fractions do not exist in the raw materials, a large amount of colloid is generated in the polymerization process of the device, the system is often blocked, the device cannot operate for a long period, in addition, the prepared product has the phenomena of relatively deep color phase, low n-heptane value, uncontrollable viscosity, uneven molecular weight distribution and the like, the compatibility with other base materials in the application process of the product market is poor, precipitation occurs in the application process, the layering phenomenon occurs, the thermal stability becomes poor and other quality accidents occur. Therefore, there is a need to invent a process for producing DCPD petroleum resins with relatively low styrene content.
Disclosure of Invention
The invention aims to provide a method for preparing methyl styrene and indene modified dicyclopentadiene petroleum resin, which can be used for preparing DCPD petroleum resin under the condition of relatively low styrene content, has ideal prepared resin yield, moderate softening point and melt viscosity, ideal n-heptane value and good product hue, is suitable for the application of industries such as paint, rubber special adhesive, printing ink, printing and the like, and effectively solves the problem that high-quality DCPD petroleum resin can not be produced due to low styrene content of cracked C9 fraction.
The invention is realized by the following technical scheme:
a process for preparing the methyl styrene-indene modified dicyclopentadiene petroleum resin includes such steps as extracting the cracked C9 raw material with styrene, separating to obtain methyl styrene fraction A, indene fraction B and dicyclic fraction C, adding inertial solvent D and assistant F, and polymerizing.
Furthermore, the content of styrene extracted from the cracking C9 raw material is 0.5-2%.
Further, the mass ratio of the methyl styrene fraction A to the indene fraction B to the bicyclic fraction C is 1.05 to 0.35, the mass ratio of the inert solvent D to the mass sum of the methyl styrene fraction A to the indene fraction B to the bicyclic fraction C is 1:0.1 to 1, and the addition amount of the auxiliary material F is 0.1-0.3%.
Furthermore, the methylstyrene fraction A is rich in methylstyrene fraction, which comprises 15-18% of 4-methylstyrene, 17-26% of o-methylstyrene, 8-25% of 3-methylstyrene, 10-16% of alpha-methylstyrene, 20-31% of beta-methylstyrene, 0.5-2% of styrene and 5-10% of other saturated aromatic hydrocarbons.
Furthermore, the indene fraction B is rich in 10-28% of methyl indene, 17-35% of indene, 5-10% of indan, less than 0.1% of naphthalene, 0.5-1% of styrene, 0.5-1% of cyclopentadiene and 15-28% of other heavy fractions.
Furthermore, the dicyclic fraction C is rich in 45-60% of dicyclopentadiene, 19-30% of methyl dicyclopentadiene, 11-23% of methyl cyclopentadiene dimer and less than 0.1% of naphthalene.
Further, the inert solvent D is an inert saturated aromatic hydrocarbon or a saturated alkane compound.
Further, the inert saturated aromatic hydrocarbon is any one of industrial toluene, industrial xylene and 200# solvent oil, and the saturated alkane compound is any one of n-hexane and cyclohexane.
Furthermore, the auxiliary material auxiliary agent F is a hindered phenol liquid antioxidant with the purity of more than or equal to 98.5 percent.
Further, the method comprises the following steps:
(1) The methyl styrene fraction A, the indene fraction B, the bicyclo-ring fraction C and an inert solvent D form a copolymerization reaction liquid, the olefin content in the copolymerization reaction liquid is 45-80%, the polymerization is carried out for 8-20h under the protection of inert gas, the temperature is controlled at 210-280 ℃, the stirring revolution of a reaction kettle is 150-260rpm, and the pressure is 1.0-2.5 MPa;
(2) After the polymerization reaction is finished, adding an auxiliary material additive F into a polymerization solution in proportion when the polymerization solution is transferred into a distillation unit, and carrying out reduced pressure distillation and steam stripping on the polymerization solution to obtain the modified dicyclopentadiene petroleum resin, wherein the temperature of the bottom of a kettle is 180-265 ℃ and the operating pressure is-0.085 to-0.095 MPa when the reduced pressure distillation and the steam stripping are carried out.
Furthermore, the monoene in the methyl styrene fraction A accounts for 10-50% of the total content of the polymerization system, the monoene in the indene fraction B accounts for 0.5-10% of the total content of the polymerization system, the diene in the bicyclic fraction C accounts for 15-65% of the total content of the polymerization system, and the inert solvent D accounts for 10-40% of the total content of the polymerization system.
Calculating the resin yield:
the content of the monoolefin in the polymerization system is adjusted by adjusting the adding amount of the methylstyrene fraction A and the indene fraction B, so that the softening point and the viscosity of a resin product can be effectively controlled, and the product yield is ensured; the chain transfer effect of the indene fraction B can reduce the generation of gel in the polymerization process, so that the positive heptane value index of the resin product is excellent; the inert solvent D can adjust the molecular weight and molecular weight distribution of the resin product, so that the quality of the resin product is more stable.
The polymerization mechanism: under certain temperature and pressure, DCPD is cracked into cyclopentadiene, diels-Alder addition reaction is carried out between CPD and DCPD to generate polymer with low molecular weight, and complex chemical reaction is carried out between polymers with low molecular weight to form macromolecule with three-dimensional space and three-dimensional network structure, wherein, methyl styrene and indene active monoolefine in the polymerization system have chain transfer function in the reaction process to inhibit the generation of overlarge molecular chain, and proper amount of inert solvent is added into the reaction system to dilute the concentration of active polymer in the system, thereby having the function of adjusting the distribution of polymerization depth and component of macromolecule.
Post-reaction treatment mechanism: and after the polymerization reaction is finished, adding a certain proportion of auxiliary material auxiliary agent F when the polymerization solution is transferred into a distillation unit, and carrying out reduced pressure distillation and steam stripping on the polymerization solution to obtain the modified DCPD petroleum resin.
Adopt above-mentioned technical scheme's positive effect: the invention effectively solves the problem that the high-quality DCPD petroleum resin can not be produced due to low content of the cracking C9 fraction styrene; the preparation method has simple process and low requirement on the purity of the raw materials, and the raffinate oil of the resin liquid can be used as a polymerization reaction solvent and recycled, thereby reducing the production cost of enterprises and being suitable for industrial production; the 200# solvent oil is adopted to replace pure industrial benzene, toluene and dimethylbenzene as a reaction solvent, so that the toxicity of the polymerization material is further reduced, and the environment protection is facilitated; the modified DCPD petroleum resin prepared by the method has ideal yield, moderate softening point and melt viscosity and high n-heptane value, and is very suitable for industries such as paint, rubber special adhesive, printing ink, printing and the like.
Detailed Description
The following embodiments are further limited, but should not be construed as limiting, to the technical solutions of the present invention:
example 1
This example illustrates the preparation of a methyl styrene, indene modified dicyclopentadiene petroleum resin.
1. Preparing raw materials:
after the cracking C9 raw material is extracted by styrene, methyl styrene fraction A, indene fraction B and dicyclic fraction C obtained by separation are adjusted according to the product design, the total content of olefin and the proportion of diene in a polymerization system are adjusted, so that the mass concentration ratio of diene to monoene is 0.88. 150g of the methylstyrene fraction A, 15g of the indene fraction B, 135g of the bicyclic fraction C and 200g of the inert solvent D are mixed uniformly and then introduced into a funnel for further use.
The methylstyrene fraction A is rich in methylstyrene fraction, including 4-methylstyrene 15% -18%, o-methylstyrene 17% -26%, 3-methylstyrene 8% -25%, alpha-methylstyrene 10% -16%, beta-methylstyrene 20% -31%, styrene 0.5-2%, other saturated aromatic hydrocarbons 5-10%.
The indene fraction B is rich in 10-28% of methyl indene, 17-35% of indene, 5-10% of indan, less than 0.1% of naphthalene, 0.5-1% of styrene, 0.5-1% of cyclopentadiene and 15-28% of other heavy fractions.
The dicyclic fraction C is rich in dicyclopentadiene 45-60%, methyl dicyclopentadiene 19-30%, methyl cyclopentadiene dimer 11-23% and naphthalene less than 0.1%.
The inert solvent D is industrial toluene.
2. Polymerization reaction:
adding the prepared copolymerization raw materials into a reaction by using a 2L closed dynamic stirring high-pressure reaction kettle, replacing 3 times by using nitrogen, starting stirring and stirring at the speed of 150-260rpm, controlling the temperature to be 210-280 ℃, and carrying out thermal polymerization for 8-20h.
3. Purification of resins
After the polymerization reaction is finished, when the polymerization liquid is transferred into a distillation unit, adding a liquid antioxidant auxiliary agent F according to the proportion of 0.065 to 0.20wt% of the total mass of the polymerization raw materials, and carrying out reduced pressure distillation and steam stripping at the kettle bottom temperature of 180-265 ℃ and the operation pressure of-0.085 to-0.095 MPa; removing the solvent and the oligomer, and cooling to obtain the modified DCPD petroleum resin.
4. Product index
The yield of the modified DCPD petroleum resin product obtained by polymerization is 45.30%, the softening point is 91 ℃, the color number is 9#, the viscosity is 76mpa · s (200 ℃), and the normal heptane value is 35ml/2g.
Example 2
The mass concentration ratio of diene to monoene in the polymerization system is adjusted to be 0.99: 1, the total content of diene is 31.54%, the total content of monoene is 31.74%, and the content of inert solvent is 36.75%. 150g of methyl styrene fraction A, 30g of indene fraction B, 165g of dicyclic fraction C and 155g of inert solvent D are mixed uniformly and then added into a closed pressure dynamic reaction kettle.
The yield of the modified DCPD petroleum resin obtained by polymerization is 50.27%, the softening point is 103 ℃, the color is 10#, the viscosity is 142mpa · s (200 ℃), and the normal heptane value is 32ml/2g.
Example 3
And adjusting the mass concentration ratio of diene to monoene in a polymerization system to be 1.07. 150g of methyl styrene fraction A, 40g of indene fraction B, 185g of double-ring fraction C and 125g of inert solvent D are uniformly mixed and then added into a closed pressure dynamic reaction kettle.
The yield of the resin obtained by the polymerization was 58.60%, the softening point was 115 ℃ and the hue was 11#, the viscosity was 358mpa · s (200 ℃) and the n-heptane value was 28ml/2g.
Example 4
The mass concentration ratio of diene to monoene in the polymerization system is adjusted to be 1.21: 1, the total content of diene is 43.93%, the total content of monoene is 36.18%, and the content of inert solvent is 19.89%. 160g of the methylstyrene fraction A, 48g of the indene fraction B, 230g of the bicyclic fraction C and 62g of the inert solvent D are mixed uniformly and then added into a closed pressure dynamic reaction kettle.
The yield of the resin obtained by the polymerization reaction was 68.24%, the softening point was 141 ℃, the hue was 12#, the viscosity was 980mpa · s (200 ℃), and the n-heptane value was 16ml/2g.
Example 5
And adjusting the mass concentration ratio of diene to monoene in the polymerization system to be 1.12, the total content of diene is 38.19%, the total content of monoene is 34.23% and the content of inert solvent is 27.57%. 180g of methyl styrene fraction A, 10g of indene fraction B, 200g of double-ring fraction C and 110g of inert solvent D are uniformly mixed and then added into a closed pressure dynamic reaction kettle.
The yield of the resin obtained by the polymerization reaction was 65.24%, the softening point was 132 ℃, the hue was 9#, the viscosity was 780mpa · s (200 ℃), and the n-heptane value was 21ml/2g.
Comparative example
The performance of polymerized DCPD petroleum resin is as follows by using a styrene fraction (styrene content is 15-25%) and a dicyclopentadiene fraction (DCPD content is 30-45%) which are prepared by cracking a C9 raw material and are not extracted and separated by styrene as polymerization raw materials:
the yield of the resin obtained by polymerization reaction is 60-65%, the softening point is 100-130 ℃, the color is 10-12#, the viscosity is 105-800mpa · s (200 ℃), and the n-heptane value is 15-20ml/2g.
The styrene fraction (styrene content is 0.5-2%) and dicyclopentadiene fraction (DCPD content is 30-45%) which are prepared by extracting and separating cracked C9 raw material from styrene are polymerization raw materials, DCPD petroleum resin is polymerized, the product performance index of the DCPD petroleum resin is greatly changed, the resin softening point is greatly increased and can reach 140 ℃, the resin viscosity index exceeds 1000 mpa.s (200 ℃) and a large amount of colloid is generated in the polymerization process of a device, a system is often blocked, the device can not run for a long period, in addition, the prepared product has the phenomena of relatively dark color phase, low n-heptane value, uneven molecular weight distribution and the like, and the compatibility with other base materials is poor in the application process of the product market.
By using the process of the invention, the cracked C9 raw material is subjected to styrene extraction separation to obtain methyl styrene fraction, indene fraction and double-ring fraction, as shown in examples 1-5, the performance index of the DCPD petroleum resin product completely reaches or exceeds the performance index of the product prepared by the original preparation process.
The raw materials of the components of the invention are all sold on the market, and the indexes of the modified DCPD petroleum resin products obtained in the above examples 1-5 are detected. The softening point is measured according to GB/T2294 standard of ring and ball method, the chroma is measured according to GB/T22295 plus Nard chroma standard, the melt viscosity is measured according to GB/T3660 melt viscosity of hot melt adhesive, and the normal-heptane value is measured according to the method specified in GB/T24138 appendix.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (5)
1. A method for preparing methyl styrene and indene modified dicyclopentadiene petroleum resin is characterized in that: after styrene extraction is carried out on a cracking C9 raw material, methyl styrene fraction A, indene fraction B and bicyclo-fraction C are obtained through separation, an inert solvent D and an auxiliary material auxiliary agent F are added, and petroleum resin is prepared through polymerization reaction; the content of styrene extracted from the cracking C9 raw material by styrene is 0.5-2%; the mass ratio of the methyl styrene fraction A to the indene fraction B to the bicyclic fraction C is 1; the methylstyrene fraction A is rich in methylstyrene fraction, including 4-methylstyrene 15% -18%, o-methylstyrene 17% -26%, 3-methylstyrene 8% -25%, alpha-methylstyrene 10% -16%, beta-methylstyrene 20% -31%, styrene 0.5-2%, other saturated aromatic hydrocarbons 5-10%; the indene fraction B is rich in 10-28% of methyl indene, 17-35% of indene, 5-10% of indan, less than 0.1% of naphthalene, 0.5-1% of styrene and 0.5-1% of cyclopentadiene, and the other heavy fractions are 15-28%; the dicyclic fraction C is rich in dicyclopentadiene 45-60%, methyl dicyclopentadiene 19-30%, methyl cyclopentadiene dimer 11-23% and naphthalene less than 0.1%.
2. The method for preparing methyl styrene indene modified dicyclopentadiene petroleum resin according to claim 1, characterized in that: the inert solvent D is an inert saturated aromatic hydrocarbon or saturated alkane compound; the inert saturated aromatic hydrocarbon is any one of industrial toluene, industrial xylene and 200# solvent oil, and the saturated alkane compound is any one of normal hexane and cyclohexane.
3. The method for preparing methyl styrene indene modified dicyclopentadiene petroleum resin according to claim 1, characterized in that: the auxiliary material auxiliary agent F is a hindered phenol liquid antioxidant with the purity of more than or equal to 98.5%.
4. The method for preparing methyl styrene indene modified dicyclopentadiene petroleum resin according to claim 1, characterized in that: the method comprises the following steps:
(1) The methyl styrene fraction A, the indene fraction B, the bicyclo-ring fraction C and an inert solvent D form a copolymerization reaction liquid, the olefin content in the copolymerization reaction liquid is 45-80%, the polymerization is carried out for 8-20h under the protection of inert gas, the temperature is controlled at 210-280 ℃, the stirring revolution of a reaction kettle is 150-260rpm, and the pressure is 1.0-2.5 MPa;
(2) After the polymerization reaction is finished, adding an auxiliary material F into the polymerization liquid in proportion when the polymerization liquid is transferred into a distillation unit, and carrying out reduced pressure distillation and steam stripping on the polymerization liquid to obtain the modified dicyclopentadiene petroleum resin, wherein the kettle bottom temperature is 180-265 ℃ and the operating pressure is-0.085 to-0.095 MPa during the reduced pressure distillation and the steam stripping.
5. The method for preparing methyl styrene indene modified dicyclopentadiene petroleum resin according to claim 4, characterized in that: the monoene in the methyl styrene fraction A accounts for 10-50% of the total content of the polymerization system, the monoene in the indene fraction B accounts for 0.5-10% of the total content of the polymerization system, the diene in the bicyclic fraction C accounts for 15-65% of the total content of the polymerization system, and the inert solvent D accounts for 10-40% of the total content of the polymerization system.
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| CN101700990B (en) * | 2009-11-03 | 2012-09-26 | 浙江恒河石油化工股份有限公司 | Method for preparing C9 petroleum resin with light color and high softening-point |
| CN102675030B (en) * | 2012-04-18 | 2015-01-07 | 天津大学 | Process method for directly separating petroleum resin raw materials from cracking C9 fraction |
| CN102746460B (en) * | 2012-06-27 | 2014-01-01 | 宁波职业技术学院 | Method for preparing cold-polymerized indene resin with high softening point and light color |
| CN104892840B (en) * | 2015-06-29 | 2017-04-05 | 安徽同心化工有限公司 | A kind of phenylethene modified dicyclopentadiene petroleum resin and preparation method thereof |
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