CN102746816B - Polyurethane sealant for safety air bag gas generator, preparation method and application thereof - Google Patents
Polyurethane sealant for safety air bag gas generator, preparation method and application thereof Download PDFInfo
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- CN102746816B CN102746816B CN201110265717.5A CN201110265717A CN102746816B CN 102746816 B CN102746816 B CN 102746816B CN 201110265717 A CN201110265717 A CN 201110265717A CN 102746816 B CN102746816 B CN 102746816B
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- polyurethane sealant
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Abstract
The invention relates to a polyurethane sealant for a safety air bag gas generator. The polyurethane sealant comprises the following raw materials, by mass, 100-200 parts of a polyether or a polyester having a molecular weight of 500-3000, 10-50 parts of diisocyanate, 4-20 parts of trimethylolpropane, 0.2-30 parts of an assistant agent, and 0.1-0.6 part of 4-tert-butylcatechol. The present invention further provides a preparation method for the polyurethane sealant and an application of the polyurethane sealant. The polyurethane sealant of the present invention is subjected to an aging test for 1 month at a temperature of 107 DEG C, the test results show that: the sealant does not flow, sealability of the generator is good, helium detection shows no leakage is generated, and durability and low pressure resistance are good. The polyurethane sealant of the present invention has the following advantages that: special use requirements of the safety air bag can be met well; the price is cheap; the process is simple; and disadvantages of the existing polyurethane sealant can be overcome with the polyurethane sealant of the present invention. In addition, the preparation method of the present invention is mature and reliable.
Description
Technical field
Invention relates to synthetic method and the technique of polyurethane sealant for a kind of air bag generator, for the sealing between the upper-lower casing of pyrotechnic pie air bag generator, to completely cut off the impact of external environment on inner medicament, producer is not produced to structural stress simultaneously.
Background technology
Air bag generator contains efficient aerogenesis medicament conventionally, when automobile has an accident collision, sensor can be sent to central vehicle control unit impact strength information, central control unit determines whether to start airbag system according to collision severe degree, when determining to start, central control unit sends ignition order, producer gas generator is lighted, inner medicament burning, discharge high-temperature expansion gas, gas is filled with and in folding airbag, forms a buffering pneumatic cushion after apparatus for supercooling, officer or passenger and automotive trim are kept apart, avoid or reduce personnel are injured.
Air bag generator generally includes the integral parts such as gas producing medicinal, upper-lower casing and medicament combustion chamber, ignition system, gas filter system.Wherein ignition system is equipped with in the space between upper-lower casing, in the combustion chamber as medicament, gas producing medicinal is housed simultaneously, produces gas when gas producing medicinal is lighted.Air bag generator seal gum is mainly used in the sealing between upper-lower casing; because gas producing medicinal and ignition system are vulnerable to the impact of extraneous moisture and air; so seal gum plays isolated ectocine, gas producing medicinal and ignition system are played a protective role, extend the effective storage life of producer gas generator.Suitable sealing adds and is filled with protection of inert gas, can make the effective service life of airbag system reach 10 years.
The domestic seal gum of the general employing of internal security airbag gas generator seal gum, as anchor 601 type half-dry type polyurethane sealants, there is following defect in this class seal gum: 1. high temperature trickling.In producer gas generator anti-aging test, require to preserve certain hour in 107 ℃ of hot and humid environment, but this class seal gum viscosity under hot conditions like this is very low, has good mobility, does not have sealing effectiveness; After considering that producer gas generator is assembled on automobile, environment for use more complicated (as sunlight is exposed to the sun etc.), so the weather resistance of this type of seal gum is just poor simultaneously.
low pressure is revealed.In producer gas generator production process, last link is to vacuumize to be filled with helium leak check.Vacuumize the vacuum tightness of will reach-0.09Mpa, often domestic a lot of seal gum all can not tolerate such vacuum tightness.According to the detection in actual production, after generally vacuumizing, be filled with helium leakage rate up to more than 10%, greatly improved fraction defective, affect the performance of enterprises, brought very large hidden danger also to officer and passenger's safety simultaneously.
Summary of the invention
The object of the present invention is to provide a kind of seal gum, it does not trickle, weather resistance is good, tolerance to low pressure good, producer good airproof performance, production technique is simple, cost is low feature, can meet the polyurethane sealant that air bag generator is used.
The present invention also aims to provide the preparation method of above-mentioned air bag generator with polyurethane sealant.
Another object of the present invention is to provide the application of above-mentioned air bag generator with polyurethane sealant.
With polyurethane sealant, the raw material by following mass parts forms air bag generator of the present invention:
Molecular weight is polyethers or the polyester 100-200 of 500-3000;
Vulcabond 10-50;
TriMethylolPropane(TMP) 4-20;
Auxiliary agent 0.2-30;
4-tert-butyl catechol 0.1-0.6.
Air bag generator of the present invention forms (optimum ratio) with polyurethane sealant by the raw material of following mass parts:
Molecular weight is polyethers or the polyester 150-200 of 500-3000;
Vulcabond 12-30;
TriMethylolPropane(TMP) 9-20;
Auxiliary agent 0.1-20;
4-tert-butyl catechol 0.3-0.5.
Molecular weight of the present invention is the polyethers of 500-3000 or polyethers or the polyester that polyester can be 2-4 hydroxy functional group.
Vulcabond of the present invention is the common commercially available vulcabond such as tolylene diisocyanate or lysinediisocyanate.
Auxiliary agent of the present invention can be aerosil, is for improving seal gum system viscosity of the present invention, the stability that improves system, weather resistance, raising resistance to elevated temperatures and tolerance to low pressure energy etc.
The nano material that auxiliary agent of the present invention also can adopt particle diameter to be less than 100nm replaces, as calcium carbonate, aluminum oxide, titanium dioxide, Magnesium Silicate q-agent and montmorillonite etc.;
4-tert-butyl catechol of the present invention is antioxidant, it add the deterioration by oxidation problem that can effectively stop in the use procedure of sealing glue.
Preparation method of the present invention, step is as follows:
(1) prepare urethane: in reactor, adding molecular weight is polyethers or the polyester of 500-3000, under the condition stirring, is warmed up to 80 ℃, add again vulcabond, TriMethylolPropane(TMP), control temperature at 80-90 ℃, after reaction 3-4h, keep temperature to 80 ± 3 ℃, every 30min, measure the viscosity of system, when viscosity reaches after 20-50Pas, add 4-tert-butyl catechol, stopped reaction;
(2) dispersion of auxiliary agent: reaction system is transferred in the container of belt stirrer, be warmed up to 100-120 ℃, stir, add after auxiliary agent, stir 1-4h discharging, obtain polyurethane sealant;
(3) removing of polyurethane sealant bubble: by the polyurethane sealant adding after auxiliary agent, transfer in vacuum extractor, in vacuum tightness-0.09 ~ and-0.095Mpa, temperature is that at 80-110 ℃, 0.5-2h removes bubble.
The application of polyurethane sealant for air bag generator of the present invention: during use, air bag generator is heated to 60 ℃ to 100 ℃ with polyurethane sealant, hand sizing, or use automatic dispensing machine applying glue.
Air bag generator of the present invention is heated to 80 ℃ of left and right while using with polyurethane sealant, viscosity reaches 20-50Pas, now can manual gluing, also seal gum can be proceeded to the packing element with heating unit, and adopt machine applying glue.When being heated to 80 ℃, adopt after machine applying glue, glue temperature to be sealed drops to the vacuum tightness that vacuumizes reach-0.09Mpa after normal temperature, and helium leak check finds that leak rate is less than 1 * 10
-7cc/s.In weathering test, maintain the temperature at 107 ℃ one month, find that seal gum does not trickle, producer stopping property is fine, helium detects air tight, weather resistance tolerance to low pressure is good.Can the fine Special use requirement that meets car safety air bag.Polyurethane sealant of the present invention can make up the deficiency of existing seal gum.Preparation method of the present invention, mature and reliable.
Embodiment
Below in conjunction with embodiment, the present invention will be further described, but protection scope of the present invention is not only confined to embodiment, and the modification that the professional in this field makes the present invention program, within all belonging to protection scope of the present invention.
embodiment 1
(1) prepare urethane: in reactor, adding molecular weight is 1000 polyoxypropyleneglycol 200Kg, under the condition stirring, be warmed up to 80 ℃, then add tolylene diisocyanate 35Kg, TriMethylolPropane(TMP) 9Kg, control temperature at 85 ℃, after reaction 4h, add 4-tert-butyl catechol 0.5Kg, reduce the temperature to 77 ℃, every 30min, measure the viscosity of system, stopped reaction after viscosity reaches 35Pas.
(2) dispersion of aerosil: reaction system is transferred in the container with twin screw strong mixer, be warmed up to 100-120 ℃, strong stirring, adds after the aerosil of 5Kg, stirs 3h discharging, obtains polyurethane sealant.
(3) removing of polyurethane sealant bubble: by the polyurethane sealant after dispersed gas aerosil, transfer in vacuum extractor, at vacuum tightness-0.09Mpa, temperature is to keep 1h to remove bubble at 100 ℃.
(4) this seal gum is heated to 80 ℃, hand sizing or machine applying glue can be used.
embodiment 2
(1) prepare urethane: in reactor, adding molecular weight is 3000 polyethylene glycol adipate 150Kg, under the condition stirring, be warmed up to 70 ℃, then add tolylene diisocyanate 15Kg, TriMethylolPropane(TMP) 9.1Kg, control temperature at 90 ℃, after reaction 2h, add 4-tert-butyl catechol 0.3Kg, reduce the temperature to 75 ℃, every 30min, measure the viscosity of system, stopped reaction after viscosity reaches 40Pas.
(2) dispersion of nano titanium oxide: reaction system is transferred in the container with twin screw strong mixer, be warmed up to 110 ℃, strong stirring, adds after the nano titanium oxide of 7Kg, stirs 4h discharging, obtains polyurethane sealant.
(3) removing of polyurethane sealant bubble: by the polyurethane sealant after dispersed gas aerosil, transfer in vacuum extractor, at vacuum tightness-0.09Mpa, temperature is to keep 2h to remove bubble at 100 ℃.
(4) this seal gum is heated to 90 ℃, hand sizing or machine applying glue can be used.
Claims (2)
1. an air bag generator polyurethane sealant, is characterized in that: the raw material by following mass parts forms:
Molecular weight is polyethers or the polyester 100-200 of 500-3000;
Vulcabond 10-50;
TriMethylolPropane(TMP) 4-20;
Auxiliary agent 0.2-30;
4-tert-butyl catechol 0.1-0.6;
Described molecular weight is the polyethers of 500-3000 or polyethers or the polyester that polyester is 2-4 hydroxy functional group;
Described vulcabond is tolylene diisocyanate or lysinediisocyanate;
Described auxiliary agent is aerosil;
Preparation by the following method, step is as follows:
(1) prepare urethane: in reactor, adding molecular weight is polyethers or the polyester of 500-3000, under the condition stirring, is warmed up to 80 ℃, add again vulcabond, TriMethylolPropane(TMP), control temperature at 80-90 ℃, after reaction 3-4h, keep temperature to 80 ± 3 ℃, every 30min, measure the viscosity of system, when viscosity reaches after 20-50Pas, add 4-tert-butyl catechol, stopped reaction;
(2) dispersion of auxiliary agent: reaction system is transferred in the container of belt stirrer, be warmed up to 100-120 ℃, stir, add after auxiliary agent, stir 1-4h discharging, obtain polyurethane sealant;
(3) removing of polyurethane sealant bubble: by the polyurethane sealant adding after auxiliary agent, transfer in vacuum extractor, in vacuum tightness-0.09 ~ and-0.095Mpa, temperature is that at 80-110 ℃, 0.5-2h removes bubble.
2. the application of an air bag generator use polyurethane sealant claimed in claim 1, it is characterized in that: during use, air bag generator is heated to 60 ℃ to 100 ℃ with polyurethane sealant, hand sizing, or use automatic dispensing machine applying glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110265717.5A CN102746816B (en) | 2011-09-08 | 2011-09-08 | Polyurethane sealant for safety air bag gas generator, preparation method and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110265717.5A CN102746816B (en) | 2011-09-08 | 2011-09-08 | Polyurethane sealant for safety air bag gas generator, preparation method and application thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102746816A CN102746816A (en) | 2012-10-24 |
| CN102746816B true CN102746816B (en) | 2014-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110265717.5A Active CN102746816B (en) | 2011-09-08 | 2011-09-08 | Polyurethane sealant for safety air bag gas generator, preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5164473A (en) * | 1990-01-16 | 1992-11-17 | Miles Inc. | Two-component polyurethane adhesive |
| CN1888003A (en) * | 2006-07-12 | 2007-01-03 | 山东恒冠化工科技有限公司 | Waterproof sealing agent for wires, cables and terminals and its prepn |
| CN102102005A (en) * | 2010-12-13 | 2011-06-22 | 嘉兴禾欣化学工业有限公司 | Preparation method of environmentally-friendly aqueous polyurethane adhesive |
-
2011
- 2011-09-08 CN CN201110265717.5A patent/CN102746816B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5164473A (en) * | 1990-01-16 | 1992-11-17 | Miles Inc. | Two-component polyurethane adhesive |
| CN1888003A (en) * | 2006-07-12 | 2007-01-03 | 山东恒冠化工科技有限公司 | Waterproof sealing agent for wires, cables and terminals and its prepn |
| CN102102005A (en) * | 2010-12-13 | 2011-06-22 | 嘉兴禾欣化学工业有限公司 | Preparation method of environmentally-friendly aqueous polyurethane adhesive |
Non-Patent Citations (1)
| Title |
|---|
| 李绍雄等.《聚氨酯胶粘剂》.《聚氨酯胶粘剂》.化学工业出版社,1998,(第1版),第97页. * |
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| CN102746816A (en) | 2012-10-24 |
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