Hand lay-up epoxy resin composition with adjustable heat release time as well as preparation method and use method of hand lay-up epoxy resin composition

Abstract

The invention relates to the technical field of hand lay-up epoxy resin compositions, in particular to a hand lay-up epoxy resin composition with adjustable heat release time as well as a preparation method and a use method of the hand lay-up epoxy resin composition. The composition comprises the following components in parts by weight: 100 parts of a component A, 0-34 parts of a component B and 0-34 parts of a component C, the sum of the parts of the component B and the component C is 30-34; the component A comprises bisphenol A epoxy resin, a reactive diluent and a defoaming agent; the component B comprises first m-xylylenediamine, first polyether amine, isophorone diamine and bisphenol A; the component C comprises second m-xylylenediamine, second polyether amine, salicylic acid and benzyl alcohol. When the hand lay-up epoxy resin composition is used, people can flexibly prepare hand lay-up epoxy resin composition materials with different heat release time according to site conditions of a construction environment, and the composition also has excellent mechanical properties on the basis that the heat release time of the composition materials can be adjusted in a large range and a large span through the formula design of the hand lay-up epoxy resin composition. And the performance requirements of wind power blade manufacturing on the opponent resin are met.

Description

Technical Field

[0001] The present application relates to the technical field of hand-layup epoxy resin compositions, and in particular to a hand-layup epoxy resin composition with adjustable exothermic time, and a preparation method and a use method thereof. Background Art

[0002] Epoxy resin reacts with amine curing agents to form a three-dimensional network polymer, so it has excellent mechanical properties such as tensile strength and tensile modulus, and is resistant to corrosion from chemicals such as acids and alkalis. It also has excellent thermal stability and is widely used in industrial fields such as wind power, shipbuilding, construction, chemicals, and automobiles.

[0003] Hand lay-up epoxy resin is suitable for hand lay-up molding process and is mainly used for bonding and strengthening defects and damage in the production process of wind turbine blades.

[0004] However, the hand lay-up process is affected by ambient temperature, heating temperature, construction time, etc., so it is necessary to select hand lay-up epoxy resins with different exothermic peak times according to the specific construction conditions. If the operator cannot select hand lay-up epoxy resins with different exothermic peak times according to the on-site construction conditions, the construction conditions and the heating characteristic parameters of the selected hand lay-up epoxy resin are not compatible, which may result in poor quality of hand lay-up plastic products or low work efficiency of the hand lay-up step.

[0005] The existing hand lay-up epoxy resin generally comes from two materials provided by the manufacturer: component A and component B. Before construction, the on-site operator mixes the materials in the component A tank and the component B tank in a certain proportion to prepare the hand lay-up epoxy resin for use.

[0006] Since the formula of the A component tank material and the B component tank material of the hand-laid epoxy resin provided on site is fixed (that is, both the A component tank material and the B component tank material are prepared according to the fixed formula), the operator mixes the two materials on site, and the heat release time characteristics of the obtained hand-laid epoxy resin are also relatively fixed, and it is difficult to adjust to the appropriate parameters. Therefore, in some cases, in order to adjust the heat release time characteristic parameters, some operators will try to adjust the ratio of the existing A component tank material and the B component tank material of the hand-laid epoxy resin to adjust the heat release time characteristic parameters of the obtained hand-laid epoxy resin. However, this method has a very small range of control over the heat release time characteristics of the hand-laid epoxy resin, and it is basically difficult to adjust to the appropriate parameters, and it may even cause the mechanical properties or other properties of the obtained hand-laid epoxy resin to be insufficient and reduced when used.

[0007] If the existing hand lay-up epoxy resin manufacturers on the market supply fixed formula A component tank materials and B component tank materials for customers to mix on site, if the user needs to adjust the required heat release time, the manufacturer is often required to re-provide different formulas of A component tank materials or B component tank materials. It can be seen that the versatility and flexible parameter adjustment of existing hand lay-up epoxy resins are very poor. Therefore, when operators use existing hand lay-up epoxy resin products, it is difficult to flexibly mix and adjust materials with different heat release times according to on-site conditions, which makes it difficult for operators to use, very inconvenient, and has a poor experience.

[0008] Therefore, it is necessary to develop an epoxy resin composition whose exothermic time can be adjusted on site and whose exothermic time has a wide range of adjustment to meet the needs of different environments. The product has strong applicability and versatility, can reduce the variety of customer products, improve user work efficiency, and enhance product market competitiveness. Summary of the invention

[0009] In order to solve the problems of the prior art mentioned in the above background technology, the present application provides a hand-layup epoxy resin composition with adjustable exothermic time, and the technical solution thereof is as follows: The present application provides a hand-layup epoxy resin composition with adjustable exotherm time, which comprises, by weight, 100 parts of component A, 0 to 34 parts of component B and 0 to 34 parts of component C; wherein the sum of the component B and the component C is 30 to 34 parts; by weight, the component A comprises 88 to 92 parts of bisphenol A epoxy resin, 8 to 12 parts of active diluent, and 0.2 to 0.5 parts of defoamer; the component B comprises 10 to 15 parts of a first meta-xylene diamine, 65 to 75 parts of a first polyether amine, 8 to 15 parts of isophorone diamine, and 8 to 10 parts of bisphenol A; the component C comprises 45 to 55 parts of a second meta-xylene diamine, 8 to 12 parts of a second polyether amine, 25 to 30 parts of salicylic acid, and 10 to 20 parts of benzyl alcohol.

[0010] In some embodiments, the hand-layup epoxy resin composition with adjustable exotherm time comprises independently packaged component A, component B, and component C; the component A consists of bisphenol A epoxy resin, a reactive diluent, and a defoaming agent; the component B consists of a first meta-xylylenediamine, a first polyetheramine, isophoronediamine, and bisphenol A; the component C consists of a second meta-xylylenediamine, a second polyetheramine, salicylic acid, and benzyl alcohol.

[0011] In some embodiments, the bisphenol A epoxy resin is one or more combinations of E51 and E54; the active diluent is one or more combinations of carbonyl glycidyl ether and 1,6-hexanediol diglycidyl ether; the defoamer is one or more combinations of BYK-A530, BYK-066N, and Deqian 6800.

[0012] In some embodiments, the purity of the first m-xylenediamine is ≥99%, and its water content is ≤0.3%; the amine value of the first polyetheramine is 450-490 mgKOH / g, and its water content is ≤0.1%; the purity of the m-isophorone diamine is ≥99.7%, and its water content is ≤0.24%; the purity of the bisphenol A is ≥99.8%, and its melting point is ≥156°C.

[0013] In some embodiments, the purity of the second m-xylylenediamine is ≥99%, and its water content is ≤0.3%; the amine value of the second polyetheramine is 450-490 mgKOH / g, and its water content is ≤0.1%; the purity of the salicylic acid is ≥99%; the purity of the benzyl alcohol is ≥99%, and its water content is ≤0.1%.

[0014] The present application also provides a method for preparing the hand-lay-up epoxy resin composition with adjustable exothermic time as described above, wherein the preparation process of component A is as follows: According to the formula, bisphenol A epoxy resin, active diluent and defoamer are mixed and dispersed uniformly to obtain component A; The preparation process of component B is: According to the formula, the first meta-xylylenediamine, the first polyetheramine and isophorone diamine are mixed, and then the mixture is heated to 60-70° C., and bisphenol A is slowly added; after the bisphenol A is added, the mixture is kept warm and dispersed at 60-70° C. for (0.5-1) h; finally, the mixture is cooled to 30-40° C. to obtain component B; The preparation process of component C is: According to the formula, the second meta-phenylenediamine and the second polyetheramine are mixed, and then the mixture is heated to 60-70°C and salicylic acid is slowly added; after the salicylic acid is added, it is kept warm and dispersed at 60-70°C for (0.5-1) h; then benzyl alcohol is added at 60-70°C and dispersed at the same temperature for (0.5-1) h; finally, the mixture is cooled to 30-40°C to obtain component C.

[0015] The present application also provides a method for using the hand-layup epoxy resin composition with adjustable exotherm time as described above: before the hand-layup molding step, component A, component B and component C are evenly mixed in a certain proportion to obtain the hand-layup epoxy resin composition with an exotherm time of 15 to 80 minutes at 25°C.

[0016] In some embodiments, 100 parts of component A and 30 to 34 parts of component B are mixed uniformly by weight to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 80 min at 25° C.; In some embodiments, 100 parts of component A and 30 to 34 parts of component C are mixed uniformly by weight to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 15 min at 25° C.

[0017] In some embodiments, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0.82 and less than or equal to 1, and the exothermic peak time of the hand-laid epoxy resin composition at 25° C. is greater than or equal to 56 min and less than or equal to 80 min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.69 and less than 0.82, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 45min and less than 56min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.53 and less than 0.69, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 31min and less than 45min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.29 and less than 0.53, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 28min and less than 31min; Or, in parts by weight, for 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0 and less than 0.29, and the exothermic peak time of the hand-layup epoxy resin composition at 25° C. is greater than or equal to 15 min and less than 28 min.

[0018] In some embodiments, before the hand lay-up molding step, component A, component B and component C are mixed evenly in a certain proportion to obtain the hand lay-up epoxy resin composition; through the hand lay-up molding process, reinforcing materials are laid in the mold and the paste epoxy resin composition is applied, and then curing molding and demolding are performed in sequence to obtain the desired plastic product.

[0019] The hand-layup epoxy resin composition with adjustable exothermic time provided in the present application has the following beneficial effects compared with the prior art: Based on the specific formula design of components A, B and C in the hand-layup epoxy resin composition of the present application, when using the hand-layup epoxy resin composition with adjustable heat release time provided by the present application, the heat release time of the epoxy resin can be regulated on-site by adjusting the addition ratio of components B and C within a certain range. People can flexibly prepare hand-layup epoxy resin composition materials with different heat release times on-site according to the on-site conditions of the construction environment, and its formula design enables it to adjust the heat release time of the composition material over a large range and a large span, and the composition also has excellent mechanical properties, thereby meeting the performance requirements of hand-layup resin for wind turbine blade production.

[0020] The present application provides a hand-layup epoxy resin composition with adjustable exotherm time, which has the characteristics of a wide range of exotherm time regulation and excellent mechanical properties. The product has strong applicability and versatility, can reduce the variety of customer products, and improve the efficiency and convenience of user on-site construction, thereby effectively improving the market competitiveness of the product. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0022] The present application provides an operation example of a preparation process of a hand-layup epoxy resin composition with adjustable exothermic time as follows: The preparation process of component A is as follows: According to the formula, bisphenol A epoxy resin, active diluent and defoamer are mixed and dispersed uniformly to obtain component A; The preparation process of component B is: According to the formula, the first meta-xylylenediamine, the first polyetheramine and isophorone diamine are mixed, and then the mixture is heated to 60-70° C., and bisphenol A is slowly added; after the bisphenol A is added, the mixture is kept warm and dispersed at 60-70° C. for (0.5-1) h; finally, the mixture is cooled to 30-40° C. to obtain component B; The preparation process of component C is: According to the formula, the second meta-phenylenediamine and the second polyetheramine are mixed, and then the mixture is heated to 60-70°C and salicylic acid is slowly added; after the salicylic acid is added, it is kept warm and dispersed at 60-70°C for (0.5-1) h; then benzyl alcohol is added at 60-70°C and dispersed at the same temperature for (0.5-1) h; finally, the mixture is cooled to 30-40°C to obtain component C.

[0023] Among them, the formula design of the hand-layup epoxy resin composition with adjustable exothermic time is: The hand-lay-up epoxy resin composition comprises, by weight, 100 parts of component A, 0 to 34 parts of component B and 0 to 34 parts of component C which are separately packaged; wherein the total of component B and component C is 30 to 34 parts; The component A is composed of bisphenol A epoxy resin, active diluent and defoamer; by weight, the component A includes 88-92 parts of bisphenol A epoxy resin, 8-12 parts of active diluent and 0.2-0.5 parts of defoamer; The B component is composed of a first meta-xylylenediamine, a first polyetheramine, isophorone diamine and bisphenol A; the B component includes 10 to 15 parts of the first meta-xylylenediamine, 65 to 75 parts of the first polyetheramine, 8 to 15 parts of isophorone diamine and 8 to 10 parts of bisphenol A; The C component consists of a second meta-xylylenediamine, a second polyetheramine, salicylic acid and benzyl alcohol; the C component includes 45 to 55 parts of the second meta-xylylenediamine, 8 to 12 parts of the second polyetheramine, 25 to 30 parts of salicylic acid and 10 to 20 parts of benzyl alcohol.

[0024] The bisphenol A epoxy resin used is one or more combinations of E51 and E54; the active diluent used is one or more combinations of carbon tetradecyl glycidyl ether and 1,6-hexanediol diglycidyl ether; the defoamer used is one or more combinations of BYK-A530, BYK-066N, and Deqian 6800. The purity of the first meta-xylenediamine used is ≥99%, and its water content is ≤0.3%; the amine value of the first polyetheramine used is 450-490 mgKOH / g, and its water content is ≤0.1%; the purity of meta-isophorone diamine used is ≥99.7%, and its water content is ≤0.24%; the purity of bisphenol A used is ≥99.8%, and its melting point is ≥156°C. The purity of the second meta-xylylenediamine is ≥99%, and its water content is ≤0.3%; the amine value of the second polyetheramine used is 450-490 mgKOH / g, and its water content is ≤0.1%; the purity of the salicylic acid used is ≥99%; the purity of the benzyl alcohol used is ≥99%, and its water content is ≤0.1%.

[0025] The present application also provides an example of a method for using the hand-layup epoxy resin composition with adjustable exothermic time as follows: Before the hand lay-up step, component A, component B and component C are mixed evenly in a certain proportion to obtain the hand lay-up epoxy resin composition having a heat release time of 15 to 80 minutes at 25° C. Then, through the hand lay-up process, reinforcing materials are laid in the mold and the epoxy resin composition is applied, and then curing molding and demoulding are performed in sequence to obtain the desired plastic product.

[0026] The specific method of adjusting the addition ratio of component B and component C to obtain different heat release times at 25°C is as follows: (1) 100 parts of component A and 30 to 34 parts of component B are mixed uniformly by weight to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 80 minutes at 25° C.; (2) In parts by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0.82 and less than or equal to 1, and the exothermic peak time of the hand-laid epoxy resin composition at 25° C. is greater than or equal to 56 min and less than or equal to 80 min; (3) In parts by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0.69 and less than 0.82, and the exothermic peak time of the hand-laid epoxy resin composition at 25° C. is greater than or equal to 45 min and less than 56 min; (4) In parts by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0.53 and less than 0.69, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 31min and less than 45min; (5) In parts by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0.29 and less than 0.53, and the exothermic peak time of the hand-laid epoxy resin composition at 25° C. is greater than or equal to 28 min and less than 31 min; (6) In parts by weight, component A is 100 parts, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0 and less than 0.29, and the exothermic peak time of the hand-lay-up epoxy resin composition at 25° C. is greater than or equal to 15 minutes and less than 28 minutes.

[0027] (7) By weight, 100 parts of component A and 30 to 34 parts of component C are mixed uniformly to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 15 minutes at 25°C.

[0028] The present application also provides the following embodiments: The formula of the hand-lay-up epoxy resin composition with adjustable exothermic time provided in the embodiment is shown in Table 1 (unit: parts by weight): Table 1

[0029] The raw materials for the hand lay-up epoxy resin composition in the specific embodiment are: The first meta-xylylenediamine used has a purity of 99.2% and a water content of 0.11%; The amine value of the first polyetheramine used is 462.9 mgKOH / g, and its water content is 0.19%; The purity of the meta-isophorone diamine used is 99.82%, and its water content is 0.1%; The purity of the bisphenol A used is 99.91%, and its melting point is 160.1°C.

[0030] The purity of the second meta-xylylenediamine is 99.2%, and its water content is 0.11%; The amine value of the second polyetheramine used is 462.9 mgKOH / g, and its water content is 0.19%; The purity of salicylic acid used is 99.5%; The purity of the benzyl alcohol used is 99.3%, and its water content is 0.05%.

[0031] The preparation process of the hand lay-up epoxy resin composition in a specific embodiment includes the following steps: (1) Preparation steps of component A: According to the weight proportions, epoxy resin, active diluent and defoamer were respectively added into a dispersion kettle, and dispersed at a speed of 80 r / min for 0.8 h to obtain component A.

[0032] (2) Preparation steps of component B: According to their weight proportions, m-phenylenediamine, polyetheramine and isophoronediamine were added to a dispersion kettle, and then the temperature was raised to 65° C., bisphenol A was slowly added, and after the addition was completed and the mixture was dispersed for 0.5 h, the temperature was lowered to 35° C. to obtain component B.

[0033] (3) Preparation steps of component C: According to the weight proportions, m-phenylenediamine and polyetheramine were added to the dispersion kettle respectively, and then the temperature was raised to 65°C, salicylic acid was slowly added, and after the addition was completed and the mixture was dispersed for 1 hour, benzyl alcohol was added, and the mixture was dispersed for 0.5 hours, and the temperature was lowered to 35°C to obtain component C.

[0034] The hand lay-up epoxy resin composition obtained in the example was made into casting specimens, and then the hand lay-up epoxy resin composition and the casting were subjected to corresponding performance tests. The results are shown in Table 2.

[0035] The preparation method of the casting body is as follows: mix component A, component B, and component C of each example according to the weight ratio in Table 1, stir evenly, add to the mold, then put into an oven and heat and cure at 70°C for 7 hours, cool to room temperature, and demold to obtain the casting body.

[0036] Table 2

[0037] Analysis of the above comparative examples and embodiment data shows that: It can be seen from Table 2 that the exothermic time of the hand-layup epoxy resin composition provided in the embodiment of the present application can be freely adjusted within a range of 15 to 80 minutes, and based on this wide range of adjustment, the cured resin also has excellent glass transition temperature, excellent tensile strength and other mechanical properties.

[0038] In summary, the hand-layup epoxy resin composition with adjustable exothermic time provided in the present application has at least the following design concepts and beneficial effects: The hand-layup epoxy resin composition provided by the present application is composed of three components of a specific formula, and the formula of the three is limited to 100 parts of component A, 0 to 34 parts of component B, and 0 to 34 parts of component C, and the sum of component B and component C is 30 to 34 parts; based on the specific formula design of component A, component B and component C in the hand-layup epoxy resin composition of the present application, when using the hand-layup epoxy resin composition with adjustable heat release time provided by the present application, by adjusting the addition ratio of component B and component C within this range, the heat release time of the epoxy resin can be regulated on site, and people can flexibly prepare hand-layup epoxy resin composition materials with different heat release times on site according to the on-site conditions of the construction environment, and its formula design enables it to adjust the heat release time of the composition material over a large range and a large span, and the composition also has excellent mechanical properties, thereby meeting the performance requirements of hand-layup resin for wind turbine blade manufacturing.

[0039] The present application provides a hand-layup epoxy resin composition with adjustable exotherm time, which has the characteristics of a wide range of exotherm time regulation and excellent mechanical properties. The product has strong applicability and versatility, can reduce the variety of customer products, and improve the efficiency and convenience of user on-site construction, thereby effectively improving the market competitiveness of the product.

[0040] It should be noted that: In this article, “~” is used to indicate a numerical range, and the range indicated by this expression includes two endpoint values.

[0041] In addition to the actual selections embodied in the above specific embodiments, the above formulation ranges may be used in the specific implementation of the present application, including but not limited to the above embodiment schemes.

[0042] The specific parameters or some commonly used reagents or raw materials in the above embodiments are specific embodiments or preferred embodiments of the present application, but are not intended to limit the present application. Those skilled in the art may make adaptive adjustments within the scope of the present application.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A hand-layup epoxy resin composition with adjustable exothermic time, characterized in that: In parts by weight, it comprises 100 parts of component A, 0 to 34 parts of component B and 0 to 34 parts of component C; wherein the total of component B and component C is 30 to 34 parts; In parts by weight, the component A comprises 88 to 92 parts of bisphenol A epoxy resin, 8 to 12 parts of active diluent, and 0.2 to 0.5 parts of defoaming agent; The B component includes 10 to 15 parts of a first meta-xylylenediamine, 65 to 75 parts of a first polyetheramine, 8 to 15 parts of isophorone diamine, and 8 to 10 parts of bisphenol A; The C component comprises 45 to 55 parts of a second meta-xylylenediamine, 8 to 12 parts of a second polyetheramine, 25 to 30 parts of salicylic acid, and 10 to 20 parts of benzyl alcohol.

2. The hand-layup epoxy resin composition with adjustable exothermic time according to claim 1, characterized in that: The hand-layup epoxy resin composition with adjustable exothermic time comprises independently packaged component A, component B, and component C; The component A is composed of bisphenol A epoxy resin, active diluent and defoamer; The B component consists of a first meta-xylylenediamine, a first polyetheramine, isophorone diamine and bisphenol A; The C component consists of a second meta-xylylenediamine, a second polyetheramine, salicylic acid and benzyl alcohol.

3. The hand-layup epoxy resin composition with adjustable exothermic time according to claim 1, characterized in that: The bisphenol A epoxy resin is one or more combinations of E51 and E54; The active diluent is one or more of carbonyl glycidyl ether and 1,6-hexanediol diglycidyl ether; The defoaming agent is one or more combinations of BYK-A530, BYK-066N and Deqian 6800.

4. The hand-layup epoxy resin composition with adjustable exothermic time according to claim 1, characterized in that: The purity of the first meta-xylylenediamine is ≥ 99%, and its water content is ≤ 0.3%; The first polyetheramine has an amine value of 450-490 mgKOH / g and a moisture content of ≤0.1%; The purity of the meta-isophorone diamine is ≥ 99.7%, and its water content is ≤ 0.24%; The purity of the bisphenol A is ≥99.8%, and its melting point is ≥156°C.

5. The hand-layup epoxy resin composition with adjustable exothermic time according to claim 1, characterized in that: The purity of the second meta-xylylenediamine is ≥99%, and its water content is ≤0.3%; The second polyetheramine has an amine value of 450-490 mgKOH / g and a water content of ≤0.1%; The purity of the salicylic acid is ≥99%; The purity of the benzyl alcohol is ≥99%, and the water content thereof is ≤0.1%.

6. A method for preparing a hand-layup epoxy resin composition with adjustable exothermic time as claimed in any one of claims 1 to 5, characterized in that: The preparation process of component A is as follows: According to the formula, bisphenol A epoxy resin, active diluent and defoamer are mixed and dispersed uniformly to obtain component A; The preparation process of component B is: According to the formula, the first meta-xylylenediamine, the first polyetheramine and isophorone diamine are mixed, and then the mixture is heated to 60-70° C., and bisphenol A is slowly added; after the bisphenol A is added, the mixture is kept warm and dispersed at 60-70° C. for (0.5-1) h; finally, the mixture is cooled to 30-40° C. to obtain component B; The preparation process of component C is: According to the formula, the second meta-phenylenediamine and the second polyetheramine are mixed, and then the mixture is heated to 60-70°C and salicylic acid is slowly added; after the salicylic acid is added, it is kept warm and dispersed at 60-70°C for (0.5-1) h; then benzyl alcohol is added at 60-70°C and dispersed at the same temperature for (0.5-1) h; finally, the mixture is cooled to 30-40°C to obtain component C.

7. A method for using the hand-layup epoxy resin composition with adjustable exothermic time as claimed in any one of claims 1 to 5, characterized in that: Before the hand lay-up step, component A, component B and component C are mixed uniformly in a certain proportion to obtain the hand lay-up epoxy resin composition having a heat release time of 15 to 80 minutes at 25°C.

8. The method of use according to claim 7, characterized in that: By weight, 100 parts of component A and 30 to 34 parts of component B are mixed evenly to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 80 minutes at 25° C.; Or, by weight, 100 parts of component A and 30 to 34 parts of component C are mixed evenly to obtain the hand-lay-up epoxy resin composition having an exothermic peak time of 15 minutes at 25°C.

9. The method of use according to claim 7, characterized in that: In parts by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.82 and less than or equal to 1, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 56min and less than or equal to 80min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.69 and less than 0.82, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 45min and less than 56min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.53 and less than 0.69, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 31min and less than 45min; Or, by weight, 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of component B and component C is greater than or equal to 0.29 and less than 0.53, and the exothermic peak time of the hand-laid epoxy resin composition at 25°C is greater than or equal to 28min and less than 31min; Or, in parts by weight, for 100 parts of component A, the total amount of component B and component C is 30 to 34 parts, and the weight ratio of the component B to the total amount of the component B and component C is greater than or equal to 0 and less than 0.29, and the exothermic peak time of the hand-layup epoxy resin composition at 25° C. is greater than or equal to 15 min and less than 28 min.

10. The method of use according to claim 7, characterized in that: Before the hand lay-up step, the components A, B and C are mixed uniformly in a certain proportion to obtain the hand lay-up epoxy resin composition; Through the hand lay-up process, the reinforcing material is laid in the mold and the epoxy resin composition is brushed, and then the desired plastic product is obtained through curing molding and demoulding treatment.

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