1. The low-heat-conduction thermal insulation material for battery pack thermal management is characterized by comprising the following raw materials in parts by weight: 80-100 parts of polyether polyol, 100-130 parts of hexamethylene diisocyanate, 0.3-0.8 part of catalyst, 2-6 parts of foaming agent, 10-20 parts of composite modifier and 1-3 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4-5: 1-2 parts of brucite fiber, sodium humate and glyceryl monostearate.

2. The low thermal conductivity and thermal insulation material for battery pack heat management according to claim 1, wherein the low thermal conductivity and thermal insulation material for battery pack heat management comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive.

3. The low thermal conductivity thermal insulation material for battery pack thermal management according to claim 1, wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of bis- (3-dimethylpropylamino) amine to dibutyltin dilaurate is 3-5: 1.

4. the low thermal conductivity thermal insulation material for battery pack thermal management according to claim 1, wherein the foaming agent is azodicarbonamide.

5. The low thermal conductivity and thermal insulation material for battery pack thermal management according to claim 1, wherein the composite modifier is prepared by the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, placing in absolute ethyl alcohol, performing ultrasonic dispersion for 20-30 min at 40-45 ℃, concentrating under reduced pressure, and drying to obtain the composite modifier.

6. The low thermal conductivity and thermal insulation material for battery pack thermal management according to claim 1, wherein the mildew preventive is an organic mildew preventive.

7. The low thermal conductivity and thermal insulation material for battery pack thermal management according to claim 6, wherein the organic mildew inhibitor is BBIT or OBPA.

8. The low thermal conductivity and thermal insulation material for battery pack heat management according to claim 1, wherein the low thermal conductivity and thermal insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 80-100 parts of polyether polyol, 100-130 parts of hexamethylene diisocyanate, 0.3-0.8 part of catalyst, 2-6 parts of foaming agent, 10-20 parts of composite modifier and 1-3 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1-2 hours at 40-50 ℃ and at the rotating speed of 1000-1500 r/min to obtain a mixture A;

and 3, keeping the temperature at 40-50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, uniformly mixing, injecting the mixture into a mold after foam is stable, curing for 50-150 min at 40-60 ℃, and demolding to obtain the low-thermal-conductivity heat-insulation material for battery pack thermal management.

Background

The battery pack is used as a main power source of larger electric products such as electric automobiles and the like, and the usage amount is huge. The temperature environment in the battery pack has great influence on the reliability, service life and performance of the battery pack in the working practice, when the battery pack works at a proper temperature, the service life of the battery pack can be effectively prolonged, the working efficiency of the battery pack is improved, and therefore the maintenance of a certain temperature range in the battery pack is very important. The battery pack can not work normally under the environment of extreme low temperature and extreme high temperature, thereby causing the electric product taking the battery pack as an energy source to work normally. Particularly, under the condition of low temperature, a certain heat preservation measure is not provided for the battery pack, and the battery pack is difficult to work normally. Therefore, the heat preservation measure of the battery pack in the low-temperature environment plays a decisive role in the performance of the battery pack. The heat-insulating material can be used as one of heat-insulating measures of the battery pack due to the advantages of convenience and quickness in use, good heat-insulating effect and the like, but the traditional heat-insulating material has good heat-insulating property, but has unsatisfactory low-temperature resistance, is difficult to keep good working performance under extremely low conditions, has unsatisfactory flame retardant property and the like. Based on the defects in the prior art, the invention provides a low-heat-conduction heat-insulation material for heat management of a battery pack.

Disclosure of Invention

The invention aims to solve the problems of unsatisfactory low-temperature resistance and flame retardance of a traditional thermal insulation material for battery pack thermal management, and provides a low-thermal-conductivity thermal insulation material for battery pack thermal management.

In order to achieve the purpose, the invention is realized by the following technical scheme:

a low-heat-conduction thermal insulation material for battery pack thermal management comprises the following raw materials in parts by weight: 80-100 parts of polyether polyol, 100-130 parts of hexamethylene diisocyanate, 0.3-0.8 part of catalyst, 2-6 parts of foaming agent, 10-20 parts of composite modifier and 1-3 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4-5: 1-2 parts of brucite fiber, sodium humate and glyceryl monostearate.

Preferably, the low-thermal-conductivity thermal-insulation material for battery pack thermal management comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive.

Preferably, the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 3-5: 1, further preferably, the mass ratio of the catalyst to the dibutyltin dilaurate is 4: 1.

preferably, the blowing agent is azodicarbonamide.

Preferably, the composite modifier is prepared by the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, placing in absolute ethyl alcohol, performing ultrasonic dispersion for 20-30 min at 40-45 ℃, concentrating under reduced pressure, and drying to obtain the composite modifier.

Preferably, the mildew preventive is an organic mildew preventive.

Preferably, the organic mildew preventive is BBIT or OBPA.

Preferably, the low-thermal-conductivity thermal-insulation material for battery pack thermal management is prepared by the following method:

step 1, respectively weighing 80-100 parts of polyether polyol, 100-130 parts of hexamethylene diisocyanate, 0.3-0.8 part of catalyst, 2-6 parts of foaming agent, 10-20 parts of composite modifier and 1-3 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1-2 hours at 40-50 ℃ and at the rotating speed of 1000-1500 r/min to obtain a mixture A;

and 3, keeping the temperature at 40-50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, uniformly mixing, injecting the mixture into a mold after foam is stable, curing for 50-150 min at 40-60 ℃, and demolding to obtain the low-thermal-conductivity heat-insulation material for battery pack thermal management.

Compared with the prior art, the heat insulation material provided by the invention has the advantages that:

1. the heat-insulating material provided by the invention is reasonable in formula, the polyether polyol and hexamethylene diisocyanate are used as main raw materials, the heat-insulating material is endowed with excellent heat-insulating and flame-retardant properties by adding the composite modifier and the mildew inhibitor in the presence of the catalyst and the foaming agent, and the obtained heat-insulating material is low in heat conductivity coefficient and can resist the low temperature of-60 ℃, so that the heat-insulating material can be applied to battery pack heat management, the problems of unsatisfactory low temperature resistance and unsatisfactory flame retardant property of the heat-insulating material for traditional battery pack heat management are effectively solved, and the heat-insulating material can be applied to regions with cold temperatures.

2. The composite modifier used in the thermal insulation material provided by the invention is compounded by brucite fiber, sodium humate and glyceryl monostearate in a reasonable proportion, wherein the sodium humate and the glyceryl monostearate are simultaneously added to play a role in synergistically improving the flame retardant property of the brucite fiber, the original flame retardant grade (UL-94HB grade) can be improved to UL-94V0 grade by the compounded composite modifier, the low temperature resistance can reach-60 ℃, and the performance is excellent; the composite modifier used in the invention is not simple physical mixture of brucite fiber, sodium humate and glycerin monostearate, and the brucite fiber, the sodium humate and the glycerin monostearate are organically combined together by an ultrasonic method so as to achieve the synergistic effect.

3. The catalyst used in the invention is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the two can enable polyether polyol and hexamethylene diisocyanate to have better synthesis speed when the two are compounded and used according to a reasonable proportion, so that the heat-insulating material has better characteristics, and experiments show that the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 3-5: 1, the synthesis speed is better, the comprehensive performance of the obtained heat-insulating material is better, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1, the combination property is best.

4. The foaming agent used in the invention is azodicarbonamide, although the azodicarbonamide has certain flammability, the composite modifier is added in the formula of the invention, so that the disadvantage of the flammability of the azodicarbonamide can be effectively avoided, and the azodicarbonamide can exert more excellent foaming property.

Detailed Description

The present invention will be further illustrated with reference to the following specific examples.

Example 1

The invention provides a low-heat-conduction heat-insulation material for battery pack heat management, which comprises the following raw materials in parts by weight: 80 parts of polyether polyol, 100 parts of hexamethylene diisocyanate, 0.8 part of catalyst, 2 parts of foaming agent, 10 parts of composite modifier and 3 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4: 1, the brucite fiber, the sodium humate and the glycerin monostearate are compounded, and the specific compounding method comprises the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, placing in anhydrous ethanol, performing ultrasonic dispersion at 45 deg.C for 20min, concentrating under reduced pressure, and drying to obtain composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 3: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 80 parts of polyether polyol, 100 parts of hexamethylene diisocyanate, 0.8 part of catalyst, 2 parts of foaming agent, 10 parts of composite modifier and 3 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 2 hours at 40 ℃ and the rotating speed of 1000r/min to obtain a mixture A;

and 3, keeping the temperature at 40 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, uniformly mixing, injecting into a mold after foam is stable, curing for 150min at 40 ℃, and demolding to obtain the low-thermal-conductivity heat-insulation material for battery pack thermal management.

Example 2

The invention provides a low-heat-conduction heat-insulation material for battery pack heat management, which comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4: 2, the brucite fiber, the sodium humate and the glycerin monostearate are compounded, and the specific compounding method comprises the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, placing in anhydrous ethanol, performing ultrasonic dispersion at 45 deg.C for 25min, concentrating under reduced pressure, and drying to obtain composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing the mixture at 50 ℃ for 100min, and demolding to obtain the low-thermal-conductivity heat-insulating material for battery pack thermal management.

Example 3

The invention provides a low-heat-conduction heat-insulation material for battery pack heat management, which comprises the following raw materials in parts by weight: 100 parts of polyether polyol, 130 parts of hexamethylene diisocyanate, 0.3 part of catalyst, 6 parts of foaming agent, 20 parts of composite modifier and 1 part of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 5: 2, the brucite fiber, the sodium humate and the glycerin monostearate are compounded, and the specific compounding method comprises the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, placing in anhydrous ethanol, performing ultrasonic dispersion at 40 deg.C for 30min, concentrating under reduced pressure, and drying to obtain composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 5: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is OBPA;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, weighing 100 parts of polyether polyol, 130 parts of hexamethylene diisocyanate, 0.3 part of catalyst, 6 parts of foaming agent, 20 parts of composite modifier and 1 part of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing for 50min at 60 ℃, and demolding to obtain the low-thermal-conductivity heat-insulation material for battery pack heat management.

Comparative example 1

A low-heat-conduction thermal insulation material for battery pack thermal management comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive;

the composite modifier is brucite fiber, the brucite fiber is placed in absolute ethyl alcohol, ultrasonic dispersion is carried out for 25min at the temperature of 45 ℃, and the composite modifier is obtained after decompression, concentration and drying;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing the mixture at 50 ℃ for 100min, and demolding to obtain the low-thermal-conductivity heat-insulating material for battery pack thermal management.

Comparative example 2

A low-heat-conduction thermal insulation material for battery pack thermal management comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4, the brucite fiber and the sodium humate are compounded, and the specific compounding method comprises the following steps: weighing brucite fiber and sodium humate respectively, placing in anhydrous ethanol, performing ultrasonic dispersion at 45 deg.C for 25min, concentrating under reduced pressure, and drying to obtain composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing the mixture at 50 ℃ for 100min, and demolding to obtain the low-thermal-conductivity heat-insulating material for battery pack thermal management.

Comparative example 3

The invention provides a low-heat-conduction heat-insulation material for battery pack heat management, which comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 2, the brucite fiber and the glycerin monostearate are compounded, and the specific compounding method comprises the following steps: weighing brucite fiber and glyceryl monostearate, respectively, placing in anhydrous ethanol, ultrasonically dispersing at 45 deg.C for 25min, concentrating under reduced pressure, and drying to obtain composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing the mixture at 50 ℃ for 100min, and demolding to obtain the low-thermal-conductivity heat-insulating material for battery pack thermal management.

Comparative example 4

A low-heat-conduction thermal insulation material for battery pack thermal management comprises the following raw materials in parts by weight: 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive;

the composite modifier is prepared from the following components in percentage by mass: 4: 2, the brucite fiber, the sodium humate and the glycerin monostearate are compounded, and the specific compounding method comprises the following steps: respectively weighing brucite fiber, sodium humate and glyceryl monostearate, and stirring and mixing uniformly to obtain a composite modifier;

wherein the catalyst is a compound of bis- (3-dimethylpropylamino) amine and dibutyltin dilaurate, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1; the foaming agent is azodicarbonamide; the mildew preventive is an organic mildew preventive, and the organic mildew preventive is BBIT;

the low-heat-conduction heat-insulation material for battery pack heat management is prepared by the following method:

step 1, respectively weighing 90 parts of polyether polyol, 120 parts of hexamethylene diisocyanate, 0.5 part of catalyst, 4 parts of foaming agent, 15 parts of composite modifier and 2 parts of mildew preventive for later use;

step 2, placing the polyether polyol and the composite modifier weighed in the step 1 into a reactor, and reacting for 1h at 50 ℃ and 1500r/min to obtain a mixture A;

and 3, keeping the temperature at 50 ℃, sequentially adding the mildew preventive, the hexamethylene diisocyanate, the catalyst and the foaming agent weighed in the step 1 into the mixture A, mixing uniformly, injecting the mixture into a mold after foam is stable, curing the mixture at 50 ℃ for 100min, and demolding to obtain the low-thermal-conductivity heat-insulating material for battery pack thermal management.

First, performance testing experiment

The performance of the heat insulating materials obtained in examples 1 to 3 and comparative examples 1 to 3 was tested, and the results are shown in Table 1.

Table 1:

	thermal conductivity W/(m.K)	Flame retardant rating	Dimensional stability
				Example 1	0.0187	V0	0.093％
Example 2	0.0143	V0	0.074％
				Example 3	0.0175	V0	0.097％
Comparative example 1	0.0334	HB	0.297％
				Comparative example 2	0.0269	V2	0.218％
Comparative example 3	0.0258	V2	0.197％

In Table 1, the thermal conductivity was determined with reference to GB/T10297-2015 standard; the flame retardant rating is determined according to UL-94 standard; conditions for dimensional stability: the rate of change after 72 hours at-60 ℃.

The experimental results in Table 1 show that the thermal conductivity of the thermal insulation materials prepared in the embodiments 1-3 of the invention is lower than 0.02W/(m.K), the flame retardant rating can reach UL-94V0 level, the dimensional stability at-60 ℃ is less than 0.1%, and the comprehensive performance is excellent.

From the experimental data of the example 2 and the comparative example, it can be seen that the thermal conductivity of the thermal insulation material obtained by using only brucite fiber as the composite modifier is 0.0334W/(m.K), the flame retardant rating is B2, the dimensional stability at-60 ℃ is 0.297%, when the composite modifier is changed into a combination of brucite fiber and sodium humate or a combination of brucite fiber and glyceryl monostearate, the thermal conductivity is reduced, the flame retardant property and the low-temperature dimensional stability are improved, but the effects are not ideal and are all worse than those of the example 2, the data shows that the sodium humate and the glyceryl monostearate have a synergistic effect after being used as the components of the combination modifier, the flame retardant property of the brucite fiber can be improved, the thermal conductivity of the thermal insulation material can be reduced, the thermal insulation performance is improved, the low-temperature resistance of the thermal insulation material can be improved, and the thermal insulation material can keep good stability at-60 ℃, so that it can be applied to cold regions.

Second, compound method research of compound modifier

The thermal conductivity, the flame retardant rating and the dimensional stability of the thermal insulation material prepared by comparative example 4 are measured according to the method in Table 1, and the measurement results show that the thermal conductivity, the flame retardant rating A2 and the dimensional stability of comparative example 4 are 0.021W/(m.K), the flame retardant rating A2 and the dimensional stability are 0.13%, and the performances are poorer than those of example 2, which indicates that the effect of the compounding method of the composite modifier provided by the invention on the thermal insulation material is not only the effect on the components, but also the effect of the compounding method, and is incomparable to pure physical stirring.

Third, the study of the catalyst of the present invention

The ratio of bis- (3-dimethylpropylamino) amine to dibutyltin dilaurate in the catalyst used in the present invention was investigated and found: when the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 3-5: 1, the reaction speed of the heat-insulating material is proper, the obtained heat-insulating material has good comprehensive performance, and the mass ratio of the bis- (3-dimethylpropylamino) amine to the dibutyltin dilaurate is 4: 1, the combination property is best.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.