Preparation method of noise-reducing, heat-insulating, aging-resistant PUR damping foam parts

Abstract

The invention discloses a method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part, belonging to the technical field of automobile foam plastic parts. The method adopts polyethylene glycol, vinyl-terminated silicone oil, ionized water, modified powder and sodium lauryl alcohol sulfonate to prepare a foam flocculent material as a gradient modifier; firstly, the foam flocculent material is injected into a mold, and then the foaming material is injected from the bottom of the mold to perform gradient modification on the middle layer and the upper surface, so as to improve the sound insulation and noise reduction, heat insulation, aging resistance, flame retardancy and scratch resistance of the upper layer and the upper surface of the foam part, prolong the service life, make the molding surface less prone to defects such as pinholes, flow lines, surface depressions, etc., and improve the molding qualification rate.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile foam plastic parts, and in particular relates to a method for preparing a PUR damping foam part. Background Art

[0002] Polyurethane foam (PUR for short) is a foamed plastic that is widely used in automotive parts and automotive part fillers, as well as other industrial products due to its excellent physical and mechanical properties, acoustic properties, thermal insulation properties and hydrophobicity.

[0003] Among them, PUR damping foam parts are used in automotive parts or automotive parts fillers, mainly to play the role of sound absorption and noise reduction, heat insulation, energy absorption and shock absorption. However, at present, PUR damping foam parts are prone to defects such as pinholes, flow lines, and surface depressions during foaming, resulting in reduced performance or loose filling, and low product qualification rate. In order to meet higher quality requirements and environmental protection requirements, the foaming auxiliary additives of PUR damping foam parts are also diverse, making the reactions involved in polyurethane synthesis complex and diverse. Different catalysts and process conditions are required to control the molecular structure and arrangement of the polymer, thereby affecting the physical and chemical properties of the final product. But in general, the automotive field has a specific range of requirements for the foaming density of PUR damping foam parts, and it is necessary to balance various performance indicators to achieve a comprehensive use effect. If a single performance indicator is enhanced, it will affect the decline of other indicators. In addition, since PUR damping foam parts are foamed with polyether polyols, polymer polyols, and isocyanates as the main raw materials, their performance after foaming is also limited by materials and cannot have breakthrough performance improvements. Therefore, it is necessary to develop composite material preparation processes and products to meet the ever-increasing use requirements of automotive industry products, such as longer service life, better sound insulation and noise reduction performance and thermal insulation performance, as well as better aging resistance and flame retardancy. Summary of the invention

[0004] The existing PUR damping foam parts are prone to defects such as pinholes, flow lines, and surface depressions during foaming, resulting in reduced performance or loose filling, low product qualification rate, and the need to improve sound insulation, heat insulation, aging resistance, and flame retardancy, as well as extend service life, in order to meet better automotive use requirements. The present invention provides a method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part, which uses a foaming material to extrude a foamed flocculent material upward to achieve gradient modification, thereby improving the sound insulation, noise reduction, heat insulation, aging resistance, flame retardancy, and scratch resistance of the upper layer and upper surface of the foam part, extending the service life, and making it less likely for defects such as pinholes, flow lines, and surface depressions to occur on the molded surface, thereby improving the molding qualification rate. The specific technical scheme is as follows:

[0005] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0006] S1: adding polyethylene glycol and vinyl-terminated silicone oil to deionized water and uniformly mixing them, then adding modified powder and uniformly dispersing and mixing them, and then adding sodium lauryl sulfonate, mixing and foaming to form a dense foamy flocculent material A;

[0007] The mass ratio of the components of the material A is polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl sulfonate = (1-4): (4-8): (70-100): (3-12): (0.5-3);

[0008] The modified powder is a mixture of mixed rubber, glass fiber and dead-burned magnesium powder; the particle sizes of the mixed rubber, glass fiber and dead-burned magnesium powder are nanometer or micrometer level;

[0009] The mixed rubber is at least one of SJY-2060-D, SJY-2060-H, SJY-2060-X and SJY-2060-Z;

[0010] S2: inject material A into the mold to fill the mold cavity, then close the mold and preheat;

[0011] The preheating temperature is 55-75°C;

[0012] S3: injecting the foaming material B into the mold through the bottom filling hole, and after closing the filling hole, foaming molding is performed;

[0013] The foaming material B is injected from the bottom surface of the mold, and the bottom surface of the mold is evenly distributed with a number of filling holes;

[0014] The heating and foaming aging time is greater than 3 minutes;

[0015] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0016] In S3 of the above method, the components of the foaming material B include base material B1 and base material B2, the base material B1 is at least one of polyether polyol, polyester polyol, polycarbonate polyol and polycaprolactone polyol; the base material B2 is at least one of naphthalene diisocyanate and diphenylmethane diisocyanate.

[0017] In S3 of the above method, the mass ratio of the components of the foaming material B is base material B1: base material B2 = (70-80): (20-30);

[0018] The preparation step of the foaming material B is to mix the base material B1 at 50-70° C. and the base material B2 at 30-50° C. to obtain the foaming material B.

[0019] In S3 of the above method, the foaming material B further includes an auxiliary material B3, and the mass ratio of base material B1: base material B2: auxiliary material B3 is (70-80): (20-30): (8-20), and the auxiliary material B3 is a mixture of triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water;

[0020] The mass ratio of the auxiliary material B3 is: triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = (5-15): (10-20): (15-30): (1-5): (10-50);

[0021] The preparation step of the foaming material B is to mix a base material B1 at 50-70° C., a base material B2 at 30-50° C., and an auxiliary material B3 at 30-50° C. to obtain the foaming material B.

[0022] Compared with the prior art, the method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foamed part of the present invention has the following beneficial effects:

[0023] 1. The method of the present invention uses foam floccules to carry the modified powder, so that the modified powder is evenly distributed in the mold. After the foaming material is added, the bottom foaming material gradually squeezes the foam floccules until the foaming material fills the mold. The modified powder in the foam floccules is gradually enriched in the upper layer of the foamed part under pressure. The modified powder and the foaming material are fused to prepare a molded foamed part. The upper layer and upper surface of the foamed part contain a large amount of modified powder, and the middle and lower layers and the bottom surface of the foamed part do not contain modified powder, or contain a very small amount of modified powder. In this way, the modified powder only modifies the upper layer and upper surface of the foamed part, and the gradient modification does not affect the mechanical properties of the middle and lower layers and the bottom surface, such as the elasticity of the foamed part and the filling adaptability of the component. The upper layer and upper surface of the modified foamed part have higher heat insulation, high temperature flame retardancy, aging resistance, sound absorption and noise reduction, and wear resistance and scratch resistance.

[0024] Second, the present invention uses polyethylene glycol to disperse the modified powder, uses sodium lauryl sulfonate as a foaming agent for foaming, and uses polyethylene glycol in combination with vinyl-terminated silicone oil to improve the bearing capacity of the foam, so that the modified powder is evenly distributed in the foam flocculent material, and no stratification and sedimentation occurs, thereby allowing the modified powder and the foaming material to be well gradient-fused. The raw material ratio of the foam flocculent material is also designed based on the content of the modified powder and the corresponding foam bearing capacity. If it exceeds the range, it will cause a waste of raw materials or stratification and sedimentation.

[0025] 3. The modified powder used in the present invention is a mixture of mixed rubber, glass fiber and dead-burned magnesium powder. The mixed rubber has better damping, sound insulation and shock absorption effects. The glass fiber has better toughness, strong heat resistance and good corrosion resistance, but poor wear resistance. Dead-burned magnesium powder has good high temperature resistance, flame retardancy, corrosion resistance, and aging resistance, and can make up for the wear resistance of glass fiber, but its mechanical properties are poor. The combination of the three can make up for the defects of the materials and improve the comprehensive performance of the foamed parts. Step fusion will not reduce the mechanical properties of the foamed parts. The particle size is designed to be nanometer or micrometer, the modification is more dense and uniform, and the suspension is good in the foam flocculent material.

[0026] Fourth, the preheating temperature of the mold designed by the present invention is 55-75°C, which can improve the foaming molding quality of the foam material. In addition, while the foam material is squeezing the foam flocculent material upward, the foam flocculent material also exerts a downward pressure on the upper surface of the foam material, and cooperates with the fusion of the foam flocculent material on the upper surface of the foam material to slow down the surface forming speed and improve the uniformity, so that the surface of the upper surface of the foam material is more full and flawless, effectively reducing surface defects, and not easy to produce defects such as pinholes, flow lines, and surface depressions.

[0027] 5. Because the method of the present invention requires step-by-step modification, it is not possible to open the mold for injection. Therefore, evenly distributed injection holes are designed on the bottom of the mold to allow the foaming material to be evenly injected from the bottom of the mold, so as to achieve slow extrusion of the foam flocculent material from bottom to top and improve the fusion effect. If the mold is opened for injection or injected downward, a good step-by-step fusion effect cannot be achieved.

[0028] 6. The present invention preheats the base material B1 and the base material B2 to improve the foaming quality. In addition, the preheated auxiliary material B3 is added to further catalyze and improve the foaming quality.

[0029] In summary, compared with the unmodified foam parts, the modified foam parts after the upper gradient modification have better sound insulation and noise reduction, heat insulation, aging resistance and flame retardancy, extend the service life, and do not affect the overall mechanical elasticity and assembly adaptability of the foam parts. In addition, the modified surface is not prone to defects such as pinholes, flow lines, and surface depressions, which improves the molding qualification rate to meet better automotive damping requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a photo of a foamed part prepared by a method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foamed part according to Example 1 of the present invention;

[0031] Figure 2 This is a photo of a foamed part prepared by a method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foamed part according to Example 2 of the present invention;

[0032] Figure 3This is a photo of a foamed part prepared by a method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foamed part according to Example 3 of the present invention;

[0033] Figure 4 This is a photo of a foamed part prepared by the method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foamed part according to Example 4 of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described below in conjunction with specific implementation cases, but the present invention is not limited to these embodiments. Example 1

[0035] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0036] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 3:6:85:10:2; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0037] The modified powder is a mixture of SJY-2060-D mixed rubber with nano-sized particles, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 3:2:2 for mixed rubber:glass fiber:dead-burned magnesium powder.

[0038] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 65°C;

[0039] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 75:25, base material B1 is polyether polyol, and base material B2 is naphthalene diisocyanate; preheat base material B1 to 65°C, preheat base material B2 to 45°C, then mix base material B1 and base material B2 for foaming to prepare foam material B; and inject foam material B into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after closing the injection holes, perform foaming molding, and the foaming aging time is 4 minutes;

[0040] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0041] like Figure 1As shown, after the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0042] Example 2

[0043] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0044] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 2:5:75:4:1; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0045] The modified powder is a mixture of SJY-2060-D mixed rubber with nano-sized particles, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 4:3:2 for mixed rubber:glass fiber:dead-burned magnesium powder.

[0046] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 70°C;

[0047] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 10:15:18:3:30, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water evenly to prepare auxiliary material B3, and preheat to 45°C;

[0048] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 75:25:12, base material B1 is polyether polyol, and base material B2 is naphthalene diisocyanate; base material B1 is preheated to 65°C, base material B2 is preheated to 50°C, and then base material B1, base material B2 and auxiliary material B3 are mixed and foamed to prepare foam material B; and foam material B is injected into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after the injection holes are closed, foaming molding is carried out, and the foaming aging time is 6 minutes;

[0049] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0050] like Figure 2As shown, after the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0051] Example 3

[0052] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0053] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 1.5: 4.5: 75: 4.5: 1.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0054] The modified powder is a mixture of SJY-2060-H rubber with a particle size of micrometers, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 2:2:3 for the rubber compound: glass fiber: dead-burned magnesium powder.

[0055] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 60°C;

[0056] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 80:20, base material B1 is polyester polyol, and base material B2 is diphenylmethane diisocyanate; preheat base material B1 to 70°C, preheat base material B2 to 50°C, then mix base material B1 and base material B2 for foaming to prepare foam material B; and inject foam material B into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after closing the injection holes, perform foaming molding, and the foaming aging time is 4.5 minutes;

[0057] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0058] like Figure 3 As shown, after the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0059] Example 4

[0060] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0061] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 3.5:7:95:11:2.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0062] The modified powder is a mixture of micron-sized rubber SJY-2060-H, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 3:2:3 for the mixed rubber:glass fiber:dead-burned magnesium powder.

[0063] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 55°C;

[0064] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 12:16:18:4:40, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water to make auxiliary material B3, and preheat to 50°C;

[0065] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 77:23:10, base material B1 is polyester polyol, and base material B2 is diphenylmethane diisocyanate; base material B1 is preheated to 70°C, base material B2 is preheated to 50°C, and then base material B1, base material B2 and auxiliary material B3 are mixed and foamed to prepare foam material B; and foam material B is injected into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after the injection holes are closed, foaming molding is carried out, and the foaming aging time is 5 minutes;

[0066] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0067] like Figure 4 As shown, after the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0068] Example 5

[0069] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0070] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 1:4:70:3:0.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0071] The modified powder is a mixture of SJY-2060-X mixed rubber with nano-sized particles, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 4:2:3 for mixed rubber:glass fiber:dead-burned magnesium powder.

[0072] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 75°C;

[0073] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 70:30, base material B1 is a mixture of polyether polyol and polycarbonate polyol, and the mixing mass ratio is polyether polyol: polycarbonate polyol 2:1; base material B2 is naphthalene diisocyanate; preheat base material B1 to 60°C, preheat base material B2 to 30°C, and then mix base material B1 and base material B2 for foaming to prepare foaming material B; and inject foaming material B into the mold through a plurality of filling holes evenly distributed on the bottom surface of the mold, and after closing the filling holes, perform foaming molding, and the foaming aging time is 5 minutes;

[0074] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0075] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0076] Example 6

[0077] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0078] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 1:4:70:3:1.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0079] The modified powder is a mixture of SJY-2060-X mixed rubber with nano-sized particles, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 5:2:3 of mixed rubber: glass fiber: dead-burned magnesium powder;

[0080] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 68°C;

[0081] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 15:20:30:5:50, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water evenly to prepare auxiliary material B3, and preheat to 50°C;

[0082] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 80:20:20, the base material B1 is a mixture of polyether polyol and polycarbonate polyol, and the mixing mass ratio is polyether polyol: polycarbonate polyol 3:1, and the base material B2 is naphthalene diisocyanate; the base material B1 is preheated to 70°C, the base material B2 is preheated to 50°C, and then the base material B1, the base material B2 and the auxiliary material B3 are mixed and foamed to prepare a foaming material B; and the foaming material B is injected into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after the injection holes are closed, foaming molding is carried out, and the foaming aging time is 6 minutes;

[0083] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0084] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0085] Example 7

[0086] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0087] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 4:8:100:12:3; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0088] The modified powder is a mixture of micron-sized rubber SJY-2060-Z, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 2:1:3.

[0089] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 72°C;

[0090] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 76:24, base material B1 is a mixture of polyester polyol and polycaprolactone polyol, and the mixing mass ratio is polyester polyol: polycaprolactone polyol = 4:1; base material B2 is diphenylmethane diisocyanate; preheat base material B1 to 65°C, preheat base material B2 to 45°C, and then mix base material B1 and base material B2 for foaming to prepare foam material B; and inject foam material B into the mold through a plurality of filling holes evenly distributed on the bottom surface of the mold, and after closing the filling holes, perform foaming molding, and the foaming aging time is 6 minutes;

[0091] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0092] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0093] Example 8

[0094] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0095] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 4:7:95:12:3; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0096] The modified powder is a mixture of micron-sized rubber SJY-2060-Z, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 1:1:3.

[0097] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 58°C;

[0098] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 5:10:15:1:10, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water evenly to prepare auxiliary material B3, and preheat to 30°C;

[0099] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 70: 30: 8, the base material B1 is a mixture of polyester polyol and polycaprolactone polyol, and the mixing mass ratio is polyester polyol: polycaprolactone polyol = 3: 1; the base material B2 is diphenylmethane diisocyanate; the base material B1 is preheated to 50°C, the base material B2 is preheated to 30°C, and then the base material B1, the base material B2 and the auxiliary material B3 are mixed and foamed to prepare a foaming material B; and the foaming material B is injected into the mold through a plurality of filling holes evenly distributed on the bottom surface of the mold, and after the filling holes are closed, foaming molding is carried out, and the foaming aging time is 4 minutes;

[0100] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0101] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0102] Example 9

[0103] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0104] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 1:8:85:9:0.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam to form a dense foamy material A;

[0105] The modified powder is a mixture of nanometer-sized rubber, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 4:2:3 for the mixed rubber: glass fiber: dead-burned magnesium powder; the mixed rubber is a mixed rubber of SJY-2060-D and SJY-2060-H, and the mixing mass ratio is SJY-2060-D:SJY-2060-H=2:1;

[0106] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 63°C;

[0107] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 74.5: 25.5, base material B1 is polycarbonate polyol, and base material B2 is naphthalene diisocyanate; preheat base material B1 to 55°C, preheat base material B2 to 40°C, then mix base material B1 and base material B2 for foaming to prepare foam material B; and inject foam material B into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after closing the injection holes, perform foaming molding, and the foaming aging time is 6 minutes;

[0108] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0109] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0110] Example 10

[0111] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0112] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 3.5:4:100:11:3; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0113] The modified powder is a mixture of nanometer-sized rubber, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 3:2:3 for the mixed rubber: glass fiber: dead-burned magnesium powder; the mixed rubber is a mixed rubber of SJY-2060-D and SJY-2060-X, and the mixing mass ratio is SJY-2060-D: SJY-2060-X=3:1;

[0114] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 67°C;

[0115] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 6:12:18:2:20, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water evenly to prepare auxiliary material B3, and preheat to 45°C;

[0116] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 78:22:15, base material B1 is polycarbonate polyol, and base material B2 is naphthalene diisocyanate; base material B1 is preheated to 65°C, base material B2 is preheated to 40°C, and then base material B1, base material B2 and auxiliary material B3 are mixed and foamed to prepare foam material B; and foam material B is injected into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after the injection holes are closed, foaming molding is carried out, and the foaming aging time is 3.5 minutes;

[0117] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0118] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0119] Embodiment 11

[0120] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0121] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 2:7:95:9:1.2; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam to form a dense foamy material A;

[0122] The modified powder is a mixture of micron-sized rubber, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 4:3:3 for the mixed rubber: glass fiber: dead-burned magnesium powder; the mixed rubber is a mixed rubber of SJY-2060-H and SJY-2060-X, and the mixing mass ratio is SJY-2060-H: SJY-2060-X=2:1;

[0123] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 64°C;

[0124] S3: Prepare materials according to the mass ratio of base material B1: base material B2 = 77:23, base material B1 is polycaprolactone polyol, and base material B2 is naphthalene diisocyanate; preheat base material B1 to 70°C, preheat base material B2 to 50°C, then mix base material B1 and base material B2 for foaming to prepare foam material B; and inject foam material B into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after closing the injection holes, perform foaming molding, and the foaming aging time is 5 minutes;

[0125] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0126] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

[0127] Example 12

[0128] A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part comprises the following steps:

[0129] S1: Prepare materials according to the mass ratio of polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl alcohol sulfonate = 3.5: 5.5: 85: 7: 1.5; add polyethylene glycol and vinyl-terminated silicone oil into deionized water and mix them evenly, then add modified powder and disperse and mix them evenly, then add sodium lauryl alcohol sulfonate, mix and foam, and form a dense foamy material A;

[0130] The modified powder is a mixture of micron-sized rubber, glass fiber and dead-burned magnesium powder, and the mixing mass ratio is 2:3:1 for the mixed rubber: glass fiber: dead-burned magnesium powder; the mixed rubber is a mixed rubber of SJY-2060-X and SJY-2060-Z, and the mixing mass ratio is SJY-2060-X:SJY-2060-Z=4:1;

[0131] S2: Inject material A into the mold to fill the upper and lower mold cavities, then close the mold and preheat to 57°C;

[0132] S3: Prepare materials according to the mass ratio of triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = 14:14:22:3:35, then mix triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water to make auxiliary material B3, and preheat to 50°C;

[0133] The materials are prepared according to the mass ratio of base material B1: base material B2: auxiliary material B3 = 74:26:12, base material B1 is polycaprolactone polyol, and base material B2 is diphenylmethane diisocyanate; base material B1 is preheated to 64°C, base material B2 is preheated to 48°C, and then base material B1, base material B2 and auxiliary material B3 are mixed and foamed to prepare foam material B; and foam material B is injected into the mold through a plurality of injection holes evenly distributed on the bottom surface of the mold, and after the injection holes are closed, foaming molding is carried out, and the foaming aging time is 5 minutes;

[0134] S4: After foaming, the mold is opened and the product is taken out, and the edges and bottom surface are trimmed to obtain the finished product.

[0135] After the foamed part of this embodiment is formed, the modified surface has no defects such as pinholes, flow lines, surface depressions, etc. Compared with the unmodified foamed part, the foamed part after the upper gradient modification has better sound insulation, heat insulation, aging resistance and flame retardancy, and prolongs the service life, and does not affect the overall mechanical elasticity and assembly adaptability of the foamed part, and has a better use effect of automotive parts.

Claims

1. A method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part, characterized in that: The method comprises the following steps: S1: adding polyethylene glycol and vinyl-terminated silicone oil to deionized water and uniformly mixing them, then adding modified powder and uniformly dispersing and mixing them, and then adding sodium lauryl sulfonate, mixing and foaming to form a dense foamy flocculent material A; The mass ratio of the components of the material A is polyethylene glycol: vinyl-terminated silicone oil: ionized water: modified powder: sodium lauryl sulfonate = (1-4): (4-8): (70-100): (3-12): (0.5-3); the modified powder is a mixture of mixed rubber, glass fiber and dead-burned magnesium powder; the particle sizes of the mixed rubber, glass fiber and dead-burned magnesium powder are nanometer or micrometer; S2: Inject material A into the mold to fill the mold cavity, then close the mold and preheat; S3: The bottom surface of the mold is evenly distributed with a number of filling holes. The foaming material B is injected into the mold through the filling holes on the bottom surface of the mold. After the filling holes are closed, foaming molding is performed. The heating and foaming curing time is greater than 3 minutes. The components of the foaming material B include base material B1 and base material B2, the base material B1 is at least one of polyether polyol, polyester polyol, polycarbonate polyol and polycaprolactone polyol; the base material B2 is at least one of naphthalene diisocyanate and diphenylmethane diisocyanate.

2. The method for preparing a noise-reducing, heat-insulating, aging-resistant PUR damping foam part according to claim 1, characterized in that: The mixed rubber is at least one of SJY-2060-D, SJY-2060-H, SJY-2060-X and SJY-2060-Z.

3. The method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part according to claim 1, characterized in that: In S2, the preheating temperature is 55-75°C.

4. The method for preparing a noise-reducing, heat-insulating, aging-resistant PUR damping foam part according to claim 1, characterized in that: In S3, the mass ratio of the components of the foaming material B is base material B1: base material B2 = (70-80): (20-30); The preparation step of the foaming material B is to mix the base material B1 at 50-70° C. and the base material B2 at 30-50° C. to obtain the foaming material B.

5. The method for preparing a noise-reducing, heat-insulating, and aging-resistant PUR damping foam part according to claim 1, characterized in that: In S3, the foaming material B also includes auxiliary material B3, and the mass ratio is base material B1: base material B2: auxiliary material B3 = (70-80): (20-30): (8-20), and the auxiliary material B3 is a mixture of triethylenediamine, stannous octoate, dibutyltin dilaurate, silicone oil and deionized water; The mass ratio of the auxiliary material B3 is: triethylenediamine: stannous octoate: dibutyltin dilaurate: silicone oil: deionized water = (5-15): (10-20): (15-30): (1-5): (10-50); The preparation step of the foaming material B is to mix a base material B1 at 50-70° C., a base material B2 at 30-50° C., and an auxiliary material B3 at 30-50° C. to obtain the foaming material B.

6. The method for preparing a noise-reducing, heat-insulating, and ageing-resistant PUR damping foam part according to claim 1, characterized in that: The method further comprises S4: after foaming and molding, opening the mold and taking out the product, and trimming the edges and the bottom surface to obtain a finished product.

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