CN102335990B

CN102335990B - Integrated multi-density polyurethane foaming products production method and equipment

Info

Publication number: CN102335990B
Application number: CN201110337386.1A
Authority: CN
Inventors: 刘静
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2011-10-31
Filing date: 2011-10-31
Publication date: 2016-02-24
Anticipated expiration: 2031-10-31
Also published as: CN102335990A

Abstract

The present invention relates to a kind of production method of foaming product, particularly relate to a kind of integrated multi-density polyurethane foaming products production method, the method comprising the steps of one, is stored to by raw material in storage tank; Step 2, tells to being fastened in the die cavity (3) that forms by patrix (1) and counterdie (2) by raw material by storage tank is uniform; Step 3, matched moulds reaction post curing is shaping; Be provided with step a between step one and step 3, control temperature, control at 15 DEG C-19 DEG C by patrix (1) centre position temperature, counterdie (2) medium position temperature controls at 38 DEG C-42 DEG C, and counterdie (2) centre position, bottom surface temperature controls at 61 DEG C-65 DEG C.In addition, the invention still further relates to the equipment that the method uses, adopt the method or equipment, goods entirety can be realized and manufacture, and the transition gradually in different aspects of the density at same position, effectively improve line ball hardness ratio.

Description

Integrated multi-density polyurethane foaming products production method and equipment

Technical field

The present invention relates to a kind of production method of foaming product, particularly relate to a kind of integrated multi-density polyurethane foaming products production method, meanwhile, present invention also offers the equipment that a kind of the method is special.

Background technology

Soft polyurethane foam is used for automotive seating art, China is imported into the end of the eighties in twentieth century, after have passed through thermal maturation foam, adding a series of improvement such as physical blowing agent foaming, now more ripe what be also generally used is polyether-type cold curing high resilience soft polyurethane foam.Along with the continuous lifting that people require automotive quality, so require that the demand of especially comfortableness aspect also improves constantly to the properties of automotive seat.

In order to ensure safety and the comfortableness of passenger, by integrating the indentation force deflection requirement to foam performance in GB (GB/T10802) and rower (QBT2080), line ball hardness ratio is greater than 1.8(highest hardness place and minimum hardness place ratio).

Existing more advanced technology makes mould according to the shape requirement of foam, mould split, is equivalent to form multiple different submodule chamber.Multiple material storage tube is equipped with in production equipment, different chemical raw materials is deposited in the inside, in different submodule chambeies, different raw materials is injected by machine set in shot process, we just can produce the foam that there is different densities at different positions like this, the indentation force deflection ratio of the foam prepared by the method reaches as high as 2.5, and in the equipment that the method adopts, each mould all uses die heater and Water pipe heating form, be distributed on outer mold wall by water pipe, the even heat of die heater pass to mould.But present production technology can only realize making the different foam of density at different positions, and same position density is identical, and this raising with regard to indentation force deflection ratio is provided with significant limitation.

Summary of the invention

For solving the deficiencies in the prior art, the invention provides a kind of line ball hardness ratio that can improve to improve the integrated multi-density polyurethane foaming products production method of goods comfort level, pass through the method, goods entirety can be realized manufacture, and the transition gradually in different aspects of the density at same position, effective raising line ball hardness ratio.

For achieving the above object, integrated multi-density polyurethane foaming products production method of the present invention, the method comprises the steps:

Step one, is stored to raw material in storage tank;

Step 2, tells in the die cavity be made up of upper die and lower die by raw material by storage tank is uniform;

Step 3, matched moulds reaction post curing is shaping;

Be provided with step a between step one and step 3, control temperature, control at 15 DEG C-19 DEG C by patrix centre position temperature, counterdie middle portion temperature controls at 38 DEG C-42 DEG C, and centre position, counterdie bottom surface temperature controls at 61 DEG C-65 DEG C.

As limitation of the invention, described patrix carries out heat trnasfer heat supply by the water pipe be connected with upper die heater, and counterdie carries out heat trnasfer heat supply by the water pipe be connected with lower die heater.

As limitation of the invention, described raw material by combined polyether and isocyanates by weight ratio 2-2.5:1 form, arrange rational ratio to ensure the well shaping of product, physical property reaches Standard.

As limitation of the invention, in step one, the temperature being stored in storage tank Raw is 20 DEG C-26 DEG C.

As limitation of the invention, in step 3, the matched moulds reaction time is 4-5 minute.

Adopt such scheme, by by patrix centre position temperature in the middle of patrix, counterdie medium position temperature, centre position, counterdie bottom surface temperature non-isothermal is arranged, make to be positioned at the raw material of die cavity from top to bottom, by three not wait and the temperature increased progressively heat, raw material is due to suffered temperature difference, when the bubble that chemical reaction generation occurs at first is shaped under condition of different temperatures, volume is different, temperature is higher, raw material is stronger by catalysts influence reactivity, generate gas more, foam is more loose, density is less, vice versa, therefore, raw material is under the processing of as above method, the density from top to bottom forming product is descending, the reaction temperature between layers of each temperature controlled each level always, the density that reaction generates product is all identical at each level course, and the reaction temperature consecutive variations between each layer, the density of product is made also to be consecutive variations, and then effectively raise indentation force deflection ratio, make indentation force deflection ratio can up to 3.5.

Simultaneously, present invention also offers a kind of integrated multi-density polyurethane foaming products production equipment, comprise upper die and lower die, upper die and lower die fasten and form the die cavity corresponding to article shape, raw material in storage tank can be uniform tell in upper die and lower die, described patrix centre position temperature is 15 DEG C-19 DEG C, and counterdie medium position temperature is 38 DEG C-42 DEG C, and centre position, counterdie bottom surface temperature is 61 DEG C-65 DEG C.

As the restriction to aforesaid way, patrix outer wall is provided with and is communicated with water pipe with upper die heater, the temperature of upper die heater passes to patrix by water pipe and being connected of patrix outer wall; Counterdie outer wall is provided with and is communicated with water pipe with lower die heater, the temperature of lower die heater passes to counterdie by water pipe and being connected of counterdie outer wall.

Adopt as above structure, by upper die heater and lower die heater, the temperature of patrix, the temperature of counterdie are controlled respectively, as above die heater is 21-22 DEG C, the temperature of lower die heater is 67-68 DEG C, in order to realize patrix centre position temperature, counterdie medium position temperature, the setting of centre position, counterdie bottom surface temperature non-isothermal, can carry out non-uniform setting to the pipeline at above-mentioned position, need the place that temperature is high, what then pipeline was arranged is more intensive, the place that temperature is low, and it is more sparse that pipeline is arranged.

Accompanying drawing explanation

Do further to describe in detail to the present invention below in conjunction with the drawings and the specific embodiments:

Fig. 1 is the overall structure schematic diagram of present device.

In figure: 1, patrix; 2, counterdie; 3, die cavity; 4, water pipe.

Detailed description of the invention

embodiment one

Composition graphs 1, present embodiments provide a kind of integrated multi-density polyurethane foaming products production method, the method comprises the steps:

Step one, by being stored in storage tank by combined polyether and the isocyanates raw material that 2-2.5:1 forms by weight ratio, mixes, and keeps temperature to be 20 DEG C-26 DEG C;

Step a, by the water pipe 4 of patrix 1 centre position A temperature by being connected with upper die heater, realize the heat exchange of water pipe 4 and patrix 1 centre position A, make temperature herein control at 15 DEG C-19 DEG C, the temperature of upper die heater is 21-22 DEG C; The water pipe 4 of counterdie 2 medium position B by being connected with lower die heater, realizes water pipe 4 and the heat exchange of counterdie medium position B, makes temperature herein control at 38 DEG C-42 DEG C; The water pipe 4 of counterdie 2 bottom surface centre position C equally by being connected with lower die heater, realizes water pipe 4 and the heat exchange of counterdie 2 bottom surface centre position C, temperature is herein controlled at 61 DEG C-65 DEG C.It should be noted that, because counterdie medium position B and counterdie bottom surface centre position C adopts same lower die heater transfer heat, in the present embodiment, the temperature of lower die heater is 67-68 DEG C, desirable value is reached in order to ensure as above two-part temperature, sparse water pipe 4 can be arranged on counterdie medium position B, and on the centre position C of counterdie bottom surface, arrange intensive water pipe 4, carry out the difference of displays temperature.

Step 2, tells to being fastened in the die cavity 3 that forms by patrix 1 and counterdie 2 by raw material by storage tank is uniform;

Step 3, matched moulds reaction post curing in 4-5 minute is shaping.

embodiment two

Present embodiments provide a kind of integrated multi-density polyurethane foaming products production equipment, as shown in Figure 1, this equipment comprises patrix 1 and counterdie 2, patrix 1 and counterdie 2 fasten and form the die cavity 3 corresponding to article shape, raw material in storage tank can be uniform tell to patrix 1 and in counterdie 2, the temperature of patrix 1 centre position A is 15 DEG C-19 DEG C, and the temperature of counterdie 2 medium position B is 38 DEG C-42 DEG C, and the temperature of counterdie 2 bottom surface centre position C is 61 DEG C-65 DEG C.

Control for realizing said temperature, patrix 1 outer wall is provided with the water pipe 4 be communicated with upper die heater, the temperature of upper die heater passes to patrix 1 by water pipe 4 and being connected of patrix 1 outer wall, wherein, the circulating water temperature that upper die heater adopts is 21-22 DEG C, in order to make the temperature of patrix 1 centre position A reach desirable value, realize by the closeness adjusting water pipe herein; Counterdie 2 outer wall is provided with the water pipe 4 be communicated with lower die heater, and the temperature of lower die heater passes to counterdie 2 by water pipe 4 and being connected of counterdie 2 outer wall.Because counterdie 2 is class U-shaped structure, counterdie medium position B is the medium position being arranged on counterdie 2 two side, in order to ensure the heating in counterdie medium position B, two counterdie medium position B are provided with in the middle part of the two side of counterdie 2, transfer heat is carried out to these two counterdie medium position B by lower die heater simultaneously, in the present embodiment, counterdie medium position B and counterdie bottom surface centre position C adopts same lower die heater transfer heat, and the temperature of lower die heater is set to 67-68 DEG C, desirable value is reached in order to ensure as above two-part temperature, sparse water pipe 4 can be arranged on counterdie medium position B, and on the centre position C of counterdie bottom surface, arrange intensive water pipe 4, the difference of temperature is realized with this.

Claims

1. integrated multi-density polyurethane foaming products production method, the method comprises the steps:

Step one, will be stored in storage tank by combined polyether and the isocyanates raw material that 2-2.5:1 forms by weight ratio, the temperature being stored in storage tank Raw is 20 DEG C-26 DEG C;

Step 2, tells to being fastened in the die cavity (3) that forms by patrix (1) and counterdie (2) by raw material by storage tank is uniform;

Step 3, matched moulds reaction post curing in 4-5 minute is shaping;

It is characterized in that being provided with step a between step one and step 3, control temperature, control at 15 DEG C-19 DEG C by patrix (1) centre position temperature, counterdie (2) medium position temperature controls at 38 DEG C-42 DEG C, and counterdie (2) centre position, bottom surface temperature controls at 61 DEG C-65 DEG C.

2. integrated multi-density polyurethane foaming products production method according to claim 1, it is characterized in that: described patrix (1) carries out heat trnasfer heat supply by the water pipe (4) be connected with upper die heater, counterdie (2) carries out heat trnasfer heat supply by the water pipe (4) be connected with lower die heater.

3. an integrated multi-density polyurethane foaming products production equipment, comprise patrix (1) and counterdie (2), patrix (1) and counterdie (2) fasten and form the die cavity (3) corresponding to article shape, raw material in storage tank can be uniform tell in patrix (1) and in counterdie (2), patrix (1) outer wall is provided with the water pipe (4) be communicated with upper die heater, and the temperature of upper die heater passes to patrix (1) by water pipe (4) and being connected of patrix (1) outer wall; Counterdie (2) outer wall is provided with the water pipe (4) be communicated with lower die heater, the temperature of lower die heater passes to counterdie (2) by water pipe (4) and being connected of counterdie (2) outer wall, it is characterized in that: described patrix (1) centre position temperature is 15 DEG C-19 DEG C, counterdie (2) medium position temperature is 38 DEG C-42 DEG C, and counterdie (2) centre position, bottom surface temperature is 61 DEG C-65 DEG C.